CN109323127A - Discharge the method and fuel cut engine method of lubricating oil - Google Patents
Discharge the method and fuel cut engine method of lubricating oil Download PDFInfo
- Publication number
- CN109323127A CN109323127A CN201810440546.7A CN201810440546A CN109323127A CN 109323127 A CN109323127 A CN 109323127A CN 201810440546 A CN201810440546 A CN 201810440546A CN 109323127 A CN109323127 A CN 109323127A
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- China
- Prior art keywords
- gas
- boil
- heat exchanger
- lubricating oil
- liquefied
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000010687 lubricating oil Substances 0.000 title claims abstract description 235
- 238000000034 method Methods 0.000 title claims abstract description 91
- 239000000446 fuel Substances 0.000 title claims abstract description 46
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 74
- 239000003507 refrigerant Substances 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000002844 melting Methods 0.000 claims abstract description 17
- 230000008018 melting Effects 0.000 claims abstract description 17
- 239000012809 cooling fluid Substances 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 345
- 239000007788 liquid Substances 0.000 claims description 169
- 238000000926 separation method Methods 0.000 claims description 146
- 239000003921 oil Substances 0.000 claims description 135
- 239000012530 fluid Substances 0.000 claims description 113
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 54
- 238000011144 upstream manufacturing Methods 0.000 claims description 47
- 229910052757 nitrogen Inorganic materials 0.000 claims description 27
- 230000006835 compression Effects 0.000 claims description 24
- 238000007906 compression Methods 0.000 claims description 24
- 239000012071 phase Substances 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 10
- 239000004519 grease Substances 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 238000005057 refrigeration Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 239000003595 mist Substances 0.000 claims description 5
- 239000007790 solid phase Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims 2
- 230000008020 evaporation Effects 0.000 claims 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 39
- 239000003345 natural gas Substances 0.000 description 19
- 239000003949 liquefied natural gas Substances 0.000 description 16
- 238000007711 solidification Methods 0.000 description 13
- 230000008023 solidification Effects 0.000 description 13
- 238000005461 lubrication Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 230000004913 activation Effects 0.000 description 10
- 230000000903 blocking effect Effects 0.000 description 10
- 238000009833 condensation Methods 0.000 description 8
- 230000005494 condensation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 230000006837 decompression Effects 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000809 air pollutant Substances 0.000 description 2
- 231100001243 air pollutant Toxicity 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/16—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity
- F17D1/18—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
- B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/01—Purifying the fluid
- F17C2265/015—Purifying the fluid by separating
- F17C2265/017—Purifying the fluid by separating different phases of a same fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/033—Treating the boil-off by recovery with cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/037—Treating the boil-off by recovery with pressurising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/038—Treating the boil-off by recovery with expanding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0102—Applications for fluid transport or storage on or in the water
- F17C2270/0105—Ships
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention discloses a kind of method and fuel cut engine method from the re-liquefied system discharge lubricating oil of boil-off gas, the re-liquefied system of boil-off gas be configured to pass by compressor compresses boil-off gas, by heat exchanger via the cooling compressed boil-off gas of the heat exchange with unpressed boil-off gas, and reduced by pressure reducer and to carry out the re-liquefied boil-off gas via the pressure of the cooling fluid of heat exchange and the compressor includes at least one glossy slip cylinder.The method includes: the compressor is sent along by-pass line for the boil-off gas for the refrigerant being not used as in the heat exchanger, then by the compressor compresses；And the heat exchanger will be sent to by the boil-off gas of some or all of the compressor compresses, condensed or the lubricating oil that solidifies after melting or viscosity reduce by being discharged by the increased boil-off gas of temperature during the compressor compresses from the re-liquefied system of the boil-off gas.
Description
Technical field
The present invention relates to a kind of methods and fuel cut engine method for discharging lubricating oil, and more particularly to one
The kind re-liquefied system of boil-off gas, wherein in the liquefied natural gas (liquefied for being supplied to engine to be used as fuel
Natural gas, LNG) ship reserve tank in the boil-off gas that generates, higher than the superfluous steaming of the demanded fuel of engine
Body of getting angry uses boil-off gas re-liquefied as refrigerant.
Background technique
Recently, the consumption of the liquefied gas such as liquefied natural gas (LNG) quicklys increase always in worldwide.Passing through will
The liquefied gas that natural gas is cooled to extremely low temperature and obtains has the volume more much smaller than natural gas, and is therefore more suitable for storing
And transport.In addition, because the air pollutants in natural gas can reduce or remove, such as LNG etc. during liquefaction process
Liquefied gas is the fuel to eco-friendly with low air pollutant emission after burning.
LNG be by by mainly by the natural gas that methane forms be cooled to about -163 DEG C with liquefy the natural gas and obtain
Colorless and transparent liquid, and have about natural gas 1/600 volume.Therefore, the liquefaction realization of natural gas extremely has
The transport of effect.
However, LNG may be easy because of temperature because natural gas liquefies under -163 DEG C of extremely low temperature under normal pressure
Small change and vaporize.Although LNG reserve tank is insulation, outside heat can continuously be transmitted to reserve tank, to cause to transport
LNG in defeated is vaporized naturally, generates boil-off gas (BOG) whereby.
The generation of BOG means the loss of LNG, and therefore has a significant impact to conevying efficiency tool.In addition, when BOG is being stored up
It deposits when being accumulated in slot, is excessively increased to cause the risk of the damage to slot there are the pressure inside reserve tank.It has carried out each
Kind research is to handle the BOG generated in LNG reserve tank.Recently, in order to handle BOG, it has been suggested that BOG is re-liquefied to return to
BOG is used as method of energy source in the fuel consumption source such as engine of boat and ship, etc. by the method for LNG reserve tank.
The example of re-liquefied method for BOG includes the method for using the refrigeration cycle with separate refrigeration agent,
Middle permission BOG exchanges heat with refrigerant so as to re-liquefied；And use BOG as the re-liquefied BOG of refrigerant and without any
The method of separate refrigeration agent.Exactly, part re-liquefied system (partial re- is known as using the system of latter method
Liquefaction system, PRS).
It can include gas engine, such as DFDE engine, X- by the example of the engine of boat and ship of natural gas refuelling
DF engine and ME-GI engine.
DFDE engine has four strokes of every circulation and uses Otto cycle (Otto cycle), wherein will have about
The natural gas of 6.5 bars of relatively low pressure is injected into combustion air inlet, is then pushed up piston with compressed gas.
X-DF engine have two strokes of every circulation, and using use have about 16 bars pressure natural gas as fire
The Otto cycle of material.
ME-GI engine has two strokes of every circulation and uses diesel cycle (diesel cycle), wherein will tool
There is the natural gas of about 300 bars of high pressure to be directly injected into combustion chamber attached in the top dead centre of piston (top dead center)
Closely.
Summary of the invention
[technical problem]
As a result, when the boil-off gas (BOG) generated in liquefied natural gas (LNG) reserve tank is compressed and in no separate refrigeration
In the case where agent via use boil-off gas carry out heat exchange and it is re-liquefied when, in order to which it is necessary to use oil lubrication for re-liquefied efficiency
Type cylinder compresses BOG at elevated pressures.
Lubricating oil is contained by the boil-off gas that glossy slip cylinder compressors are compressed.It was found by the inventors of the present invention that through pressing
Lubricating oil contained in contracting BOG is condensed or is solidified before BOG, and in a heat exchanger through compressing the cooling period of BOG
Stop the fluid channel of heat exchanger.Exactly, with the print of narrow fluid channel (such as microfluidic channel type fluid channel)
Brush circuit heat exchanger (printed circuit heat exchanger, PCHE) is often because of the lubricating oil of condensation or solidification
And make fluid channel compared with frequent jams.
Correspondingly, the present inventor has developed various technologies, for make lubricating oil with through compress BOG separate so as to
The fluid channel of lubricating oil blocking heat-exchanger that prevents from being condensed or solidify.
The embodiment of the present invention provides a kind of for alleviating or preventing the fluid channel of heat exchanger from being condensed or being solidified
Lubricating oil blocking method and system, and its fluid that can remove blocking heat-exchanger via simple and economic technique is logical
The lubricating oil condensed or solidify in road.
[technical solution]
According to an aspect of the present invention, a kind of method from the re-liquefied system discharge lubricating oil of BOG, the BOG are provided
Re-liquefied system is configured to pass by compressor compresses BOG, by heat exchanger and cools down via the heat exchange with unpressed BOG
The compressed BOG, and reduced via the pressure of the cooling fluid of heat exchange by pressure reducer Lai the re-liquefied BOG,
In the BOG of refrigerant wait be used as in the heat exchanger be supplied to the heat exchanger along first supply pipe line, be used as institute
The BOG for stating the refrigerant in heat exchanger is supplied to the compressor along second supply pipe line, and is not used as institute
The BOG for stating the refrigerant in heat exchanger is supplied to the compressor along around the by-pass line of the heat exchanger,
And wherein the flow rate for adjusting fluid and the bypass valve opened/closed for corresponding to supply line are placed in the shunt valve
On line, the flow rate for adjusting fluid is placed in described first with the first valve opened/closed for corresponding to supply line and supplies
It answers in the upstream of the heat exchanger on pipeline, for adjusting the flow rate of fluid and opening/closing for corresponding supply line
The second valve be placed on the second supply pipe line in the downstream of the heat exchanger, and the compressor includes at least one
Glossy slip cylinder, the method includes: 2) opening the bypass valve and simultaneously close off first valve and second valve；3) will
The BOG for the refrigerant being not used as in the heat exchanger is sent to the compressor along the by-pass line, so
Afterwards by the compressor compresses；And 4) heat will be sent to by the BOG of some or all of the compressor compresses
Exchanger, condensed or the lubricating oil that solidifies after melting or viscosity reduce by being increased by temperature during the compressor compresses
The BOG added is discharged from the re-liquefied system of the BOG.
The Grease relief method can further include: 1) before step 2 determined whether remove through condensation or
The time of the lubricating oil of solidification.
BOG it is re-liquefied after, can be separated from each other by gas/liquid separation by the liquefied gas and gaseous state BOG of re-liquefied generation,
It can be discharged along the 5th supply line from gas/liquid separation by the liquefied gas of gas/liquid separation separation, and by gas/liquid separation
Isolated gaseous state BOG can be discharged along the 6th supply line from gas/liquid separation, and the Grease relief method can be wrapped further
Contain: 5) sending gas/liquid separation for the BOG by heat exchanger；And 6) discharge accumulates in gas/liquid separation
Lubricating oil.
Grease relief method can further include: the BOG that gas/liquid separation is sent in step 5) is supplied along the 6th
Pipeline is answered to be sent to by-pass line to be subjected to the compression in step 3).
Repeatable step 3) arrives step 5), until the temperature of the zone of heat liberation of heat exchanger increases to by compressor compresses
And it is sent to the temperature of the BOG of heat exchanger.
In step 4), fuel, and the surplus not used by engine can be used as by engine by the BOG of compressor compresses
BOG heat exchanger can be transmitted.
In step 1), it can determine that if meeting at least one of the following conditions, discharge is condensed or solidified
The time of lubricating oil: to the BOG of the heat exchanger upstream as the refrigerant in heat exchanger and by compressor compresses and by heat
The temperature difference (hereinafter referred to as " temperature difference of cold flow ") between the cooling BOG of exchanger is the first preset value or higher and continue pre- timing
Between the condition of period or longer time；BOG as the refrigerant in heat exchanger and by compressor compresses and it is sent to hot friendship
The temperature difference (hereinafter referred to as " temperature difference of hot-fluid ") between the BOG of parallel operation is the first preset value or higher and predetermined hold-time period
Or the condition of longer time；And position by compressor compresses and in the upstream of the heat exchanger is sent to the BOG of heat exchanger
Pressure difference between the BOG cooled down at the position in heat exchanger downstream by heat exchanger be (hereinafter referred to as " zone of heat liberation
Pressure difference ") it is the second preset value or higher and predetermined hold-time period or longer time condition.
In step 1), if to the BOG of the heat exchanger upstream as the refrigerant in heat exchanger and by compressor
It compresses and the temperature difference (hereinafter referred to as " temperature difference of cold flow ") between the BOG that is cooled down by heat exchanger and as in heat exchanger
The BOG of refrigerant and by compressor compresses and the temperature difference (hereinafter referred to as " temperature of hot-fluid that is sent between the BOG of heat exchanger
Difference ") between lower value be the first preset value or higher and predetermined hold-time period or longer time, or if by compressor
It compresses and is sent to the BOG of heat exchanger at position in the upstream of the heat exchanger and is handed at the position in heat exchanger downstream by heat
Pressure difference (hereinafter referred to as " pressure difference of zone of heat liberation ") between the cooling BOG of parallel operation is the second preset value or higher and hold
Continuous predetermined period of time or longer time then can determine time of lubricating oil that discharge is condensed or solidified.
BOG it is re-liquefied after, by gas/liquid separation separate liquefied gas can be sent to storage along the 5th supply line
Slot, and the 8th valve of the flow rate and corresponding supply line for adjusting fluid opened/closed can be placed in the 5th supply
On pipeline, the 8th valve is closed during step 2) to step 6).
After determining that heat exchanger restores normal, it can be executed after the first valve of opening and the second valve simultaneously close off bypass valve
BOG's is re-liquefied.
According to another aspect of the present invention, a kind of method from the re-liquefied system discharge lubricating oil of BOG, the BOG are provided
Re-liquefied system is configured to pass by compressor compresses BOG, by heat exchanger and cools down via the heat exchange with unpressed BOG
The compressed BOG, and reduced via the pressure of the cooling fluid of heat exchange by pressure reducer Lai the re-liquefied BOG,
Described in compressor include at least one glossy slip cylinder, the BOG is sent to via the by-pass line around over-heat-exchanger
Compressor and by compressor compresses, is supplied to engine by the BOG of compressor compresses, and is not supplied to the superfluous of engine
BOG be supplied to heat exchanger with make lubricating oil melt or its viscosity reduce after use increased by temperature during compressor compresses
BOG discharge the lubricating oil that is condensed or solidified.
BOG it is re-liquefied after, can be separated from each other by gas/liquid separation by the liquefied gas and gaseous state BOG of re-liquefied generation,
And by gas/liquid separation separation gaseous state BOG can along the 6th supply line from gas/liquid separation discharge, and wherein melting or
Viscosity reduces and is collected in gas/liquid separation by the lubricating oil by the increased BOG discharge of temperature during compressor compresses.
After BOG filtering lubricant oil, passing through bypass by least one of oil eliminator and the first oil filter
Heat exchanger can be transmitted by the BOG of compressor compresses after pipeline.
The separable lubricating oil with vapour phase or mist phase of first oil filter.
It is upper that second oil filter can be placed at least one of following position: the position between pressure reducer and gas/liquid separation
Set, by gas/liquid separation separate liquefied gas can be discharged via the 5th supply line and the 6th supply line, it is described
Second oil filter is low temperature oil filter.
The separable lubricating oil with solid phase of second oil filter.
Passed through after heat exchanger by compressor compresses and be sent to gas/liquid separation BOG can by along
6th supply line is sent to by-pass line to be subjected to duplicate cycle period by compressor compresses.
The cycle period is repeatable until the temperature of the zone of heat liberation of heat exchanger reaches by compressor compresses and hair
It is sent to the temperature of the BOG of heat exchanger.
According to another aspect of the present invention, a kind of method from the re-liquefied system discharge lubricating oil of BOG, the BOG are provided
Re-liquefied system is configured to use BOG as the re-liquefied BOG of refrigerant, and wherein heat exchanger uses after BOG is re-liquefied
The BOG discharged from reserve tank is as refrigerant via the cooling BOG by compressor compresses of heat exchange；The compressor includes at least
One glossy slip cylinder；And condensed or the lubricating oil that solidifies by be disposed to around over-heat-exchanger by-pass line discharge and
It is used during overhauling heat exchanger after melting or viscosity reduce.
According to another aspect of the present invention, a kind of method from the re-liquefied system discharge lubricating oil of BOG, the BOG are provided
Re-liquefied system is configured to pass by compressor compresses BOG, by heat exchanger and cools down via the heat exchange with unpressed BOG
The compressed BOG, and reduced via the pressure of the cooling fluid of heat exchange by pressure reducer Lai the re-liquefied BOG,
Described in compressor include at least one glossy slip cylinder, and if meeting at least one of the following conditions determination arrive
Time of lubricating oil that discharge is condensed or solidified: the BOG of the heat exchanger upstream of the refrigerant wait be used as in heat exchanger and
The temperature difference (hereinafter referred to as " temperature difference of cold flow ") between BOG cooled down by compressor compresses and by heat exchanger is the first preset value
Or higher and predetermined hold-time period or longer time condition；BOG as the refrigerant in heat exchanger and by compressing
It is the first preset value or higher that machine, which compresses and be sent to the temperature difference (hereinafter referred to as " temperature difference of hot-fluid ") between the BOG of heat exchanger,
And the condition in predetermined hold-time period or longer time；And position hair by compressor compresses and in the upstream of the heat exchanger
The pressure difference that the BOG of heat exchanger is sent between the BOG that is cooled down at the position in heat exchanger downstream by heat exchanger is (hereafter
Referred to as " pressure difference of zone of heat liberation ") it is the second preset value or higher and predetermined hold-time period or longer time item
Part.
According to another aspect of the present invention, a kind of method from the re-liquefied system discharge lubricating oil of BOG, the BOG are provided
Re-liquefied system is configured to pass by compressor compresses BOG, by heat exchanger and cools down via the heat exchange with unpressed BOG
The compressed BOG, and reduced via the pressure of the cooling fluid of heat exchange by pressure reducer Lai the re-liquefied BOG,
Described in compressor include at least one glossy slip cylinder, and if wait be used as heat exchanger in refrigerant heat exchanger
The temperature difference (hereinafter referred to as " temperature difference of cold flow ") between the BOG of upstream and the BOG cooled down by compressor compresses and by heat exchanger
And BOG as the refrigerant in heat exchanger and by compressor compresses and the temperature difference that is sent between the BOG of heat exchanger
Lower value between (hereinafter referred to as " temperature difference of hot-fluid ") is the first preset value or higher and predetermined hold-time period or longer
Time, or if position by compressor compresses and in the upstream of the heat exchanger is sent to the BOG of heat exchanger and in heat exchange
Pressure difference (hereinafter referred to as " pressure difference of zone of heat liberation ") between the BOG cooled down at the position in device downstream by heat exchanger is
Second preset value or higher and predetermined hold-time period or longer time, it is determined that the lubrication for being condensed or being solidified to discharge
The time of oil.
According to another aspect of the present invention, a kind of method from the re-liquefied system discharge lubricating oil of BOG, the BOG are provided
Re-liquefied system is configured to use BOG as the re-liquefied BOG of refrigerant, wherein in the temperature difference based on equipment and pressure difference
At least one determines for discharge the time point of lubricating oil for being condensed or being solidified, and by notification unit instruction for discharge through cold
The time point of solidifying or solidification lubricating oil.
The equipment may include the heat exchanger comprising micro-channel type fluid channel.
According to another aspect of the present invention, a kind of method from the re-liquefied system discharge lubricating oil of BOG, the BOG are provided
Re-liquefied system is configured to use BOG as the re-liquefied BOG of refrigerant, the lubricating oil wherein collected in gas/liquid separation
It is discharged via the Grease relief pipeline separated with the 5th supply line from gas/liquid separation, by the liquid of the re-liquefied generation of BOG
Change gas and is discharged via the 5th supply line from gas/liquid separation.
Lubricating oil can increase from the speed that gas/liquid separation discharges and by nitrogen supply (NS) into gas/liquid separation.
BOG it is re-liquefied after, compressed BOG can use BOG to cool down as refrigerant in a heat exchanger, and
After discharging lubricating oil, nitrogen can be supplied to gas/liquid separation along zone of heat liberation, and compressed BOG is via zone of heat liberation
It is supplied to heat exchanger.
The nitrogen for being supplied to gas/liquid separation can have 5 bars to 7 bars of pressure.
BOG it is re-liquefied after, by gas/liquid separation separate liquefied gas can be sent to storage along the 5th supply line
Slot, and the 8th valve can be placed on the 5th supply line flow rate to adjust fluid and the 5th supply line beat ON/OFF
It closes, the 8th valve is closed during the discharge of lubricating oil.
Engine can drive during the discharge of lubricating oil.
After the discharge of lubricating oil, the BOG to be supplied to the cold fluid pass of heat exchanger can be compressed and around overheat
The zone of heat liberation of heat exchanger is sent to after exchanger.
According to another aspect of the present invention, a kind of fuel cut engine method is provided, wherein being condensed or being solidified
It is supplied fuel to and is started by the lubricating oil melting that makes to be condensed or solidify or reduce its viscosity and during the discharge of lubricating oil
Machine.
It can be indicated by notification unit for discharging the time point of lubricating oil for being condensed or being solidified.
If the performance of heat exchanger is reduced to 60% to the 80% of its normal performance, it can determine discharge through condensing
Or the time of the lubricating oil of solidification.
First preset value can be 35 DEG C.
Second preset value can be twice of the preset value of normal operating.
Second preset value can be 2 bars (200kPa).
Predetermined period of time can be 1 hour.
The temperature difference of cold flow can be by being placed in the first temperature sensor of the cold fluid pass upstream of heat exchanger and being placed in
4th temperature sensor in the zone of heat liberation downstream of heat exchanger detects.
The temperature difference of hot-fluid can be by being placed in the second temperature sensor in the cold fluid pass downstream of heat exchanger and being placed in
The third temperature sensor of the zone of heat liberation upstream of heat exchanger detects.
The pressure difference of zone of heat liberation can be by being placed in the first pressure sensor of the zone of heat liberation upstream of heat exchanger
With the second pressure sensor detection in the zone of heat liberation downstream for being placed in heat exchanger.
The pressure difference of zone of heat liberation can by pressure difference transducer measure heat exchanger zone of heat liberation upstream and
Pressure difference between the downstream of the zone of heat liberation of heat exchanger detects.
BOG can be compressed to 150 bars to 350 bars of pressure by invention invention invention compressor.
BOG can be compressed to 80 bars to 250 bars of pressure by compressor.
Heat exchanger may include micro-channel type fluid channel.
Heat exchanger can be printed circuit heat exchanger (PCHE).
[favourable effect]
With an embodiment of the invention it is possible to remove heat exchanger via simple and economic technique using existing equipment
The internal lubricating oil condensed or solidify removes lubricating oil without installing individual equipment or the individual fluid of supply.
With an embodiment of the invention it is possible to be started by being driven during the removal for the lubricating oil for being condensed or being solidified
Machine and engine continuous operation while overhaul heat exchanger.Further, it may be possible to use the surplus not being used by the engine
BOG removes the lubricating oil for being condensed or being solidified.Further, it may be possible to use the lubricating oil that engine combustion is mixed with BOG.
According to an embodiment of the invention, when lubricating oil is collected in gas/liquid separation, it is possible to the improved gas of use/
Liquid/gas separator effectively discharges lubricating oil melting or that viscosity reduces.
According to an embodiment of the invention, low temperature oil filter is placed in the position in pressure reducer downstream, liquefied gas from gas liquid separation
Device discharge institute via the 5th supply line and BOG from gas/liquid separation discharge via the 6th supply line at least
On one, realizes effectively remove the lubricating oil mixed with BOG whereby.
Even if with an embodiment of the invention it is possible to via simple and economic technique using existing equipment and without independent
Equipment also meet the admission pressure condition of compressor while maintaining re-liquefied performance and the engine fuel of engine is wanted
It asks.
Detailed description of the invention
Fig. 1 is the schematic diagram of the re-liquefied system of BOG of first embodiment according to the present invention.
Fig. 2 is the schematic diagram of the re-liquefied system of BOG of second embodiment according to the present invention.
Fig. 3 is the schematic diagram of the re-liquefied system of BOG of third embodiment according to the present invention.
Fig. 4 is the enlarged view of gas/liquid separation according to an embodiment of the invention.
Fig. 5 (a) and Fig. 5 (b) is the enlarged view of the second oil filter according to an embodiment of the invention.
Fig. 6 (a) and Fig. 6 (b) is the enlarged view of the second oil filter according to another embodiment of the present invention.
Fig. 7 is the schematic diagram of the re-liquefied system of BOG of fourth embodiment according to the present invention.
Fig. 8 is the enlarged view of pressure reducer according to an embodiment of the invention.
Fig. 9 is the enlarged view of pressure reducer according to another embodiment of the present invention.
Figure 10 is the enlarged view of heat exchanger and gas/liquid separation according to an embodiment of the invention.
Figure 11 and Figure 12 is the curve for describing the re-liquefied amount of the BOG pressure depended in the re-liquefied system in part (PRS).
Figure 13 is the plan view of filter cell shown in Fig. 5 (a) and Fig. 5 (b) and Fig. 6 (a) and Fig. 6 (b).
Drawing reference numeral explanation
100: heat exchanger；
200: compressor；
210: cylinder；
211: cooler；
220: cylinder；
221: cooler；
230: cylinder；
231: cooler；
240: cylinder；
241: cooler；
250: cylinder；
251: cooler；
300: oil eliminator；
410: the first oil filters；
420: the second oil filters；
421: filter cell；
422: flowing into pipe；
423: delivery pipe；
424: oily delivery pipe；
425: fixed plate；
510: the first valves；
520: the second valves；
530: third valve；
541: recycle valve；
542: recycle valve；
543: recycle valve；
544: recycle valve；
550: check-valves；
560: the six valves；
570: the seven valves；
571: the ten valves；
581: the eight valves；
582: the nine valves；
583: nitrogen valve；
590: bypass valve；
600: pressure reducer；
610: pressure reducer；
620: isolating valve；
700: gas/liquid separation；
810: the first temperature sensors；
820: second temperature sensor；
830: third temperature sensor；
840: the four temperature sensors；
910: first pressure sensor；
920: second pressure sensor；
930: pressure difference transducer；
940: fluid level sensor；
A: position；
B: position；
C: position；
L1: first supply pipe line；
L2: second supply pipe line；
L3: third supply line；
L4: the four supply line；
L5: the five supply line；
L6: the six supply line；
L22: the seven supply line；
L33: the eight supply line；
BL: by-pass line；
NL: nitrogen supply (NS) pipeline；
OL: Grease relief pipeline；
SL: fuel supply lines；
Rcl: the first recirculation line；
Rc2: the second recirculation line；
Rc3: third recirculation line；
Rc4: the four recirculation line；
T: reserve tank；
X: space；
Z: space.
Specific embodiment
Hereafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.The re-liquefied system of BOG according to the present invention can be applied
In various ships, such as the ship equipped with the engine by natural gas refuelling, the ship comprising liquefied gas reserve tank, Ship Structure,
Etc..It should be understood that following embodiment can be modified and not limited the scope of the invention in different ways.
In addition, the fluid in each fluid supply tube line of the system according to the present invention can have liquid phase, vapour-liquid mixed phase,
Vapour phase and supercritical fluid phase, this depends on the operating condition of system.
Fig. 1 is the schematic diagram of the re-liquefied system of BOG of first embodiment according to the present invention.
Referring to Fig. 1, the re-liquefied system of BOG according to this embodiment includes compressor 200, heat exchanger 100, pressure reducer
600, by-pass line BL and bypass valve 590.
Compressor 200 compresses the BOG discharged from reserve tank T, and may include multiple 210,220,230,240,250 and of cylinder
Multiple coolers 211,221,231,241,251.The BOG compressed by compressor 200 can have about 150 bars to 350 bars of pressure.
The some BOG compressed by compressor 200 can be supplied to the sustainer of ship along fuel supply lines SL, and will not
Heat exchanger 100 can be supplied to along third supply line L3 by other BOG that sustainer uses to be subjected to re-liquefied mistake
Journey.Sustainer can be the ME-GI engine for using the high-pressure natural gas of the pressure with about 300 bars as fuel.
It is assigned by some BOG of some cylinders 210,220 in the cylinder of compressor 200 and is supplied to power generation
Machine.Generator according to this embodiment can be DF engine, use the low pressure natural gas with about 6.5 bars of pressure as
Fuel.
Heat exchanger 100, which is used, to discharge from reserve tank T and passes through along the BOG that first supply pipe line L1 is supplied as refrigerant
By the cooling BOG compressed by compressor 200 and supplied along third supply line L3 of heat exchange.As in heat exchanger 100
The BOG of refrigerant is sent to compressor 200 along second supply pipe line L2, and the fluid cooled down by heat exchanger 100 is along
Four supply line L4 are supplied to pressure reducer 600.
Pressure reducer 600 reduces the pressure of BOG compressed by compressor 200 and then cooled down by heat exchanger 100.Part or
Whole BOG gas is re-liquefied via the compression of compressor 200, the cooling of heat exchanger 100 and the decompression of pressure reducer 600.
Pressure reducer 600 can be expansion valve, such as Joule-Thomson valve (Joule-Thomson valve), or can be inflator
(inflator)。
The re-liquefied system of BOG according to this embodiment can further include gas/liquid separation 700, be placed in pressure reducer
600 rear so that in vapour phase remaining BOG with by via compressor 200, heat exchanger 100 and pressure reducer 600 to BOG gas
The liquefied natural gas of the re-liquefied generation of body separates.
It is supplied to reserve tank T along the 5th supply line L5 by the isolated liquefied gas of gas/liquid separation 700, and by gas/liquid
The isolated BOG of separator 700 can be combined with the BOG discharged from reserve tank T and is supplied to heat exchanger 100.
The 9th valve 582 opened/closed for adjusting flow rate and corresponding supply line can be placed in the 6th supply
On pipeline L6, the BOG with vapour phase is discharged via the 6th supply line from gas/liquid separation 700.
If heat exchanger 100 is for example unavailable after the maintenance or failure of heat exchanger 100, allow from storage
The BOG of slot T discharge is via by-pass line BL around over-heat-exchanger 100.By-pass line BL, which has, opens and closes by-pass line BL
Bypass valve 590.
Fig. 2 is the schematic diagram of the re-liquefied system of BOG of second embodiment according to the present invention.
Referring to Fig. 2, the re-liquefied system of BOG according to this embodiment includes heat exchanger 100, the first valve 510, the second valve
520, the first temperature sensor 810, second temperature sensor 820, compressor 200, third temperature sensor 830, the 4th temperature
Sensor 840, first pressure sensor 910, second pressure sensor 920, pressure reducer 600, by-pass line BL and bypass valve
590。
Heat exchanger 100 uses the BOG discharged from reserve tank T cooling by compressor 200 via heat exchange as refrigerant
The BOG of compression.The BOG for the refrigerant for discharging and being used as in heat exchanger 100 from reserve tank T is sent to compressor 200, and by pressing
The BOG that contracting machine 200 compresses uses the BOG discharged from reserve tank T to cool down as refrigerant by heat exchanger 100.
The BOG discharged from reserve tank T is supplied to heat exchanger 100 along first supply pipe line L1 and is used as refrigerant, and
BOG as the refrigerant in heat exchanger 100 is sent to compressor 200 along second supply pipe line L2.It is pressed by compressor 200
The BOG of some or all of contracting is supplied to heat exchanger 100 along third supply line L3 to cool down, and by heat exchanger
100 cooling fluids are supplied to pressure reducer 600 along the 4th supply line L4.
First valve 510, which is placed on first supply pipe line L1, beats ON/OFF with adjust flow rate and corresponding supply line
It closes, and the second valve 520 is placed on second supply pipe line L2 to adjust flow rate and correspond to opening/closing for supply line.
100 front of heat exchanger that first temperature sensor 810 is placed on first supply pipe line L1 is to measure from storage
Slot T discharges and is supplied to the temperature of the BOG of heat exchanger 100.Preferably, the first temperature sensor 810, which nestles up, is placed in heat
The temperature of the BOG before it will be supplied to heat exchanger 100 is measured in front of exchanger 100.
Herein, term " in front " means upstream, and term " at rear " means downstream.
The downstream for the heat exchanger 100 that second temperature sensor 820 is placed on second supply pipe line L2 is to measure from storage
Deposit the temperature of the BOG for the refrigerant that slot T discharge is used as later in heat exchanger 100.Preferably, second temperature sensor 820 is tight
The temperature of the BOG after the refrigerant being used as in heat exchanger 100 is measured against the rear for being placed in heat exchanger 100
Degree.
The compression of compressor 200 is used as the BOG of the refrigerant in heat exchanger 100 after reserve tank T discharge.By compressor
The BOG of 200 compressions can be supplied to for use as fuel in high-pressure engine, and be supplied in high-pressure engine remaining BOG later
It is re-liquefied to realize that heat exchanger 100 can be supplied to.
The 6th valve 560 opened/closed for adjusting flow rate and corresponding supply line can be placed in fuel supply
On pipeline SL, the BOG compressed by compressor 200 is supplied to high-pressure engine via the fuel supply lines.
6th valve 560 serves as safety device and is arrived with turning off BOG at once after the gas mode operation disruption of high-pressure engine
The supply of high-pressure engine.Gas mode means the mode that engine uses natural gas as fuel handling.When wait be used as combustion
When the BOG of material is inadequate, engine is switched to fuel oil mode to allow for fuel oil to be used as the fuel of engine.
The 7th valve 570 opened/closed for adjusting flow rate and corresponding supply line can be placed in supply line
On, the superfluous BOG of the demanded fuel higher than high-pressure engine in BOG compressed by compressor 200 is via the supply
Pipeline is supplied to heat exchanger 100.
When the BOG compressed by compressor 200 is supplied to high-pressure engine, BOG can be compressed to high pressure by compressor 200
Pressure needed for motivation.High-pressure engine can be the ME-GI engine for using high pressure BOG as fuel.
Known use of ME-GI engine has about 150 bars to 400 bars, and preferably about 150 bars to about 350 bars, more preferably from about
The natural gas of 300 bars of pressure is as fuel.Compressor 200 BOG can be compressed to about 150 bars to about 350 bars of pressure so as to
BOG will be compressed and be supplied to ME-GI engine.
Made instead of, as sustainer, being may be used in ME-GI engine under about 6 bars to about 20 bars of pressure using BOG
For the X-DF engine or DF engine of fuel.In this case, because the BOG that compressed for being supplied to sustainer has
Low pressure, so can further compress with the re-liquefied BOG through compression BOG to be supplied to sustainer.For re-liquefied
The BOG further compressed can have about 80 bars to 250 bars of pressure.
Figure 11 and Figure 12 is the curve for describing the re-liquefied amount of the BOG pressure depended in the re-liquefied system in part (PRS).
Re-liquefied target BOG means to be different from the BOG as refrigerant via the re-liquefied BOG of cooling.
Referring to Figure 11 and Figure 12, it is seen then that when the pressure of BOG is in the range of 150 bars to 170 bars, re-liquefied amount reaches
Maximum value, and when the pressure of BOG is in the range of 150 bars to 300 bars, re-liquefied amount is substantially free from change.Accordingly, as
High-pressure engine uses the BOG of the pressure with about 150 bars to about 350 bars (300 bars most of) to send out as the ME-GI of fuel
Motivation can control re-liquefied system easily to supply fuel to high-pressure engine while maintaining high liquefaction amount.
Compressor 200 may include multiple cylinders 210,220,230,240,250, and be respectively disposed on the multiple cylinder
210, multiple coolers 211,221,231,241,251 in 220,230,240,250 downstreams.Cooler 211,221,231,241,
The 251 cooling BOG for compressing and having high pressure and temperature by cylinder 210,220,230,240,250.
In the structure that wherein compressor 200 includes the multiple cylinder 210,220,230,240,250, it is sent to compression
The BOG of machine 200 is by the multiple cylinder 210,220,230,240,250 via multiple stage compressions.Cylinder 210,220,230,
240, each of 250 compression terminals that may act as each of compressor 200.
Compressor 200 may include: the first recirculation line RCl has passed through the first cylinder 210 and the first cooler 211
Some or all of BOG the front end of the first cylinder 210 is supplied to via first recirculation line；Second recirculation line
RC2 has passed through the BOG of some or all of the second cylinder 220 and the second cooler 221 via second recirculation line
It is supplied to the front end of the second cylinder 220；Third recirculation line RC3, has passed through third cylinder 230 and third cooler 231
Some or all of BOG the front end of third cylinder 230 is supplied to via the third recirculation line；And the 4th recycling
Pipeline 244, passed through the 4th cylinder 240, the 4th cooler 241, the 5th cylinder 250 and the 5th cooler 251 part or
Whole BOG is supplied to the front end of the 4th cylinder 240 via the 4th recirculation line.
In addition, the first recycle valve 541 opened/closed for adjusting flow rate and corresponding supply line can dispose
In the second recycle valve opened/closed on the first recirculation line RC1, for adjusting flow rate with corresponding to supply line
542 can be placed on the second recirculation line RC2, for adjusting the opened/closed of flow rate and corresponding supply line
Three recycle valves 543 can be placed on third recirculation line RC3, and for adjusting flow rate and corresponding to beating for supply line
4th recycle valve 544 of opening/closing can be placed on the 4th recirculation line RC4.
Recirculation line RC1, RC2, RC3, RC4 pass through the recycle sections when reserve tank T has low pressure or the BOG of whole
Compressor 200 is protected with admission pressure condition needed for meeting compressor 200.When unused recirculation line RC1, RC2,
When RC3, RC4, recycle valve 541,542,543,544 is closed, and the admission pressure condition needed for be unsatisfactory for compressor 200 and
When needing using recirculation line RC1, RC2, RC3, RC4, recycle valve 541,542,543,544 is opened.
Although Fig. 2 shows all the multiple cylinders 210,220,230,240,250 for wherein having passed through compressor 200
BOG be supplied to the structure of heat exchanger 100, but passed through some cylinders in cylinder 210,220,230,240,250
BOG can be assigned to be supplied to heat exchanger 100 in compressor 200.
In addition, the BOG for having passed through some cylinders in cylinder 210,220,230,240,250 can be in compressor 200
It is assigned to be supplied to low compression engine to be used as fuel, and superfluous BOG can be supplied to gas combustion unit (gas
Combustion unit, GCU) to be burned.
Low compression engine can be use the BOG with about 6 bars to 10 bars of pressure as fuel DF engine (such as
DFDE)。
It include that some cylinders in the cylinder 210,220,230,240,250 in compressor 200 can be with oil-free lubrication side
Formula operation, and other cylinders can be operated in a manner of oil lubrication.Exactly, when BOG is compressed to 80 bars or higher, preferably 100
Bar or it is higher, to use the BOG compressed by compressor 200 as the fuel of high-pressure engine or for realizing re-liquefied efficiency
When, BOG is compressed to high pressure comprising glossy slip cylinder by compressor 200.
In the related art, the lubricating oil for lubricating and cooling down is supplied to reciprocating-type compressor 200 (for example, its piston
Obturator), so that BOG is compressed to 100 bars or higher.
Because lubricating oil is supplied to glossy slip cylinder, in the related art some lubricating oil with passed through it is glossy
The BOG of slip cylinder is mixed.It was found by the inventors of the present invention that the lubricating oil mixed with through compression BOG is before BOG in heat exchange
It condenses or solidifies and the fluid channel of blocking heat-exchanger 100 in device 100.
The re-liquefied system of BOG according to this embodiment can further include oil eliminator 300 and the first oil filter 410,
It is placed between compressor 200 and heat exchanger 100 so that oil is separated with BOG.
Oil eliminator 300 is generally separated the lubricating oil in liquid phase, and the profit in the first oil filter 410 separation vapour phase or mist phase
Lubricating oil.Because the separation of oil eliminator 300 has than the lubrication by the big particle size of the isolated lubricating oil of the first oil filter 410
Oil, so the upstream that oil eliminator 300 is placed in the first oil filter 410 lead to the BOG compressed by compressor 200 can in proper order
It crosses oil eliminator 300 and the first oil filter 410 is supplied to heat exchanger 100 later.
Although Fig. 2 shows the structure that the re-liquefied system of wherein BOG includes both oil eliminator 300 and the first oil filter 410,
But the re-liquefied system of BOG according to this embodiment may include one in oil eliminator 300 and the first oil filter 410.Preferably,
Use both oil eliminator 300 and the first oil filter 410.
In addition, although providing the second supply pipe line L2 for arriving 200 downstream of compressor Fig. 2 shows wherein the first oil filter 410
Structure, but the third supply line L3 of 100 upstream of heat exchanger can also be provided in the first oil filter 410, and can provide more
It is a to be arranged in parallel.
In one and the compressor 200 that the re-liquefied system of wherein BOG includes in oil eliminator 300 and the first oil filter 410
In structure comprising oil-free lubrication type cylinder and glossy slip cylinder, oil can be supplied to by the BOG of glossy slip cylinder
Separator 300 and/or the first oil filter 410, and the BOG for only having passed through oil-free lubrication type cylinder can direct supply to heat exchanger
100, without passing through oil eliminator 300 or oil filter 410.
By means of example, compressor 200 according to this embodiment includes five cylinders 210,220,230,240,250,
In first three cylinder 210,220,230 can be oil-free lubrication type cylinder, and latter two cylinder 240,250 can be glossy slip
Cylinder.Herein, in the re-liquefied system of BOG according to this embodiment, BOG can be in BOG in three phases or less than three phases
Not by direct supplying to heat exchanger 100 in the case where oil eliminator 300 or the first oil filter 410 after middle distribution, and can
In four-stage or it is more than in four-stage after distribution after through oil eliminator 300 and/or the first oil filter 410 in BOG
It is supplied to first heat exchanger 100.
First oil filter 410 can be coalescer oil filter (coalescer oil filter).
Check-valves (check valve) 550 can be placed on fuel supply lines SL in compressor 200 and high-pressure engine
Between.Check-valves 550 is to prevent BOG when high-pressure engine stops back to compressor and damage compressor.
In the structure that the re-liquefied system of wherein BOG includes oil eliminator 300 and/or the first oil filter 410, check-valves
550 can be placed in the downstream of oil eliminator 300 and/or the first oil filter 410 so as to prevent BOG flow back into oil eliminator 300 and/
Or first oil filter 410.
In addition, because BOG may flow back into compressor 200 and damage compressor 200 when expansion valve 600 is closed suddenly,
So the slave fuel supply lines SL that check-valves 550 can be placed in third supply line L3 forms the upstream of the branch point of branch.
Third temperature sensor 830 is placed in the upstream of the heat exchanger 100 on third supply line L3 to measure by pressing
Contracting machine 200 compresses and is then fed to the temperature of the BOG of heat exchanger 100.Preferably, third temperature sensor 830 nestles up
100 front of heat exchanger is placed in measure the temperature of the BOG before it will be supplied to heat exchanger 100.
4th temperature sensor 840 is placed in the downstream of the heat exchanger 100 on the 4th supply line L4 to measure by pressing
The temperature of the compression of contracting machine 200 and the BOG then cooled down by heat exchanger 100.Preferably, the 4th temperature sensor 840 nestles up
The rear of heat exchanger 100 is placed in measure immediately in the temperature by the BOG after cooling of heat exchanger 100.
First pressure sensor 910 is placed in the upstream of the heat exchanger 100 on third supply line L3 to measure by pressing
Contracting machine 200 compresses and is then fed to the pressure of the BOG of heat exchanger 100.Preferably, first pressure sensor 910 nestles up
100 front of heat exchanger is placed in measure the pressure of the BOG before it will be supplied to heat exchanger 100.
Second pressure sensor 920 is placed in the downstream of the heat exchanger 100 on the 4th supply line L4 to measure by pressing
The pressure of the compression of contracting machine 200 and the BOG then cooled down by heat exchanger 100.Preferably, second pressure sensor 920 nestles up
The rear of heat exchanger 100 is placed in measure immediately in the pressure by the BOG after cooling of heat exchanger 100.
As shown in Fig. 2, although it is preferable that all first to the 4th temperature sensor 810 to 840, first pressure sensor
910 and second pressure sensor 920 provide arrive re-liquefied system, it should be appreciated that the invention is not limited thereto.Alternatively, re-liquefied system
Can have only the first temperature sensor 810 and the 4th temperature sensor 840 (" first pair "), only 820 and of second temperature sensor
Third temperature sensor 830 (" second pair "), only first pressure sensor 910 and second pressure sensor 920 (" third to "),
Or described first to third to two pairs in the middle.
Pressure reducer 600 is placed in the downstream of heat exchanger 100 with to being compressed by compressor 200 and then by heat exchanger
100 cooling BOG decompressions.All or part of BOG gas via the compression of compressor 200, the cooling of heat exchanger 100 and
The decompression of pressure reducer 600 and it is re-liquefied.Pressure reducer 600 can be expansion valve, such as Joule-Thomson valve, or can be inflation
Machine.
The re-liquefied system of BOG according to this embodiment can further include gas/liquid separation 700, be placed in pressure reducer
600 downstream so that in vapour phase remaining BOG with by via compressor 200, heat exchanger 100 and pressure reducer 600 to BOG gas
The liquefied natural gas of the re-liquefied generation of body separates.
It is supplied to reserve tank T along the 5th supply line L5 by the isolated liquefied gas of gas/liquid separation 700, and by gas/liquid
The isolated BOG of separator 700 can with combined along the 6th supply line L6 from the BOG that reserve tank T is discharged and be supplied to hot friendship
Parallel operation 100.
Although Fig. 2 shows wherein combined and connect with the BOG discharged from reserve tank T by the isolated BOG of gas/liquid separation 700
Be supplied to the structure of heat exchanger 100, it should be appreciated that the invention is not limited thereto.By means of example, heat exchanger 100 can be by
Three fluid channel compositions, and heat exchange can be supplied to along individual fluid channel by the isolated BOG of gas/liquid separation 700
Device 100 is so as to wherein as refrigerant.
Alternatively, gas/liquid separation 700 can omit, and the re-liquefied system of BOG can be configured to allow fluid via pressure reducer
600 decompression and partly or entirely it is re-liquefied to direct supply to reserve tank T.
The 8th valve 581 opened/closed for adjusting flow rate and corresponding supply line can be placed in the 5th supply
On pipeline L5.The liquid level of liquefied gas is adjusted by the 8th valve 581 in gas/liquid separation 700.
The 9th valve 592 opened/closed for adjusting flow rate and corresponding supply line can be placed in the 6th supply
On pipeline L6.The internal pressure of gas/liquid separation 700 can be adjusted by the 9th valve 592.
Fig. 4 is the enlarged view of gas/liquid separation according to an embodiment of the invention.Referring to Fig. 4, gas liquid separation
Device 700 can have fluid level sensor 940, measure the liquid level of natural gas in gas/liquid separation 700.
The re-liquefied system of BOG according to this embodiment may include the second oil filter 420, be placed in pressure reducer 600 it is gentle/
To filter the lubricating oil mixed with the fluid for the decompression for being subjected to pressure reducer 600 between liquid/gas separator 700.
Referring to Fig. 2 and Fig. 4, the second oil filter 420 can be placed on the 4th supply line L4 in pressure reducer 600 and gas/liquid
Between separator 700 (in Fig. 4, the A of position), re-liquefied gas from gas/liquid separation 700 discharge via the 5th supply line
L5 upper (in Fig. 4, the B of position), or gaseous state BOG from gas/liquid separation 700 discharge via the 6th supply line L6 on (Fig. 4
In, position C).Fig. 2 shows wherein the second oil filters 420 to be placed in the structure at the position A in Fig. 4.
It can be combined with the BOG discharged from reserve tank T by the isolated BOG of gas/liquid separation 700 and be supplied to heat exchanger
100 cold fluid pass.Herein, because lubricating oil is collected in gas/liquid separation 700, even if in the presence of a small amount of lubricating oil
May be with being mixed by the isolated gaseous state BOG of gas/liquid separation 700 a possibility that.
It was found by the inventors of the present invention that when being mixed and being sent with lubricating oil by the isolated gaseous state BOG of gas/liquid separation 700
To heat exchanger 100 cold fluid pass when, it may occur however that supplied than the lubricating oil that is mixed with the BOG compressed by compressor 200
The more difficult situation of the case of the zone of heat liberation of heat exchanger 100 should be arrived.
Because the fluid of the refrigerant wait be used as in heat exchanger 100 is sent to the cold fluid pass of heat exchanger 100, institute
It is persistently supplied to re-liquefied system with low temperature BOG when the operation of re-liquefied system, and has sufficiently high temperature so that through condensing
Or the fluid of the oil melting of solidification is not supplied to thereon.Therefore, it is extremely difficult to which the cryogen that removal accumulates on heat exchanger 100 is logical
The oil condensed or solidify in road.
In order to which heat exchanger will be supplied to lubricating oil and by the mixture of the isolated gaseous state BOG of gas/liquid separation 700
A possibility that 100 cold fluid pass, is reduced to as low as possible, and the second oil filter 420 can be placed at position A or C in Fig. 4.
It is placed in the structure at the position C in Fig. 4 in wherein the second oil filter 420, because most of melting or glutinous
Reduced lubricating oil is spent to lubricate with liquid-phase collection in gas/liquid separation 700 and along the gaseous state of the 6th feed line L6 discharge
The amount of oil is smaller, so re-liquefied system has the advantages that filtration efficiency and do not need frequently to replace the second oil filter 420.
It is placed in the structure at the position B in Fig. 4 in wherein the second oil filter 420, because can prevent lubricating oil from flowing into
Reserve tank T, it is possible to prevent the pollution for the liquefied gas being stored in reserve tank T.
Because the first oil filter 410 is placed in the downstream of compressor 200 and has about 40 by the BOG that compressor 200 compresses
DEG C about 45 DEG C of temperature is arrived, so low temperature oil filter need not be used.However, because pressure is had by the reduced fluid of pressure reducer 600
There have about -160 DEG C to about -150 DEG C of temperature to be at least part of re-liquefied to allow BOG's, and because by gas/liquid separation
700 isolated liquefied gas and BOG have about -160 DEG C to about -150 DEG C of temperature, thus the second oil filter 420 must be directed to it is low
Warm temperature design, and the position independent of the second oil filter 420 in position A, B, C and D in Fig. 4.
In addition, because most of profits of about 40 DEG C to 45 DEG C of temperature are mixed and had with the BOG compressed by compressor 200
Lubricating oil has liquid phase or mist phase, so oil eliminator 300 is designed to the lubricating oil for being suitable for separating liquid phase, and the first oil filter
410 are designed to the lubricating oil for being suitable for separating mist phase (it may include some lubricating oil in vapour phase).
On the contrary, as cryogen and pressure separates by the reduced fluid of pressure reducer 600, by gas/liquid separation 700
BOG, and with by gas/liquid separation 700 it is isolated liquefied gas mixing the lubrication in flow point solid phase below (or curdled appearance)
Oil, the second oil filter 420 are designed to be suitable for separating the lubricating oil in (or in curdled appearance) solid phase.
Fig. 5 (a) and Fig. 5 (b) are the enlarged views of the second oil filter according to an embodiment of the invention, and Fig. 6 (a)
It is the enlarged view of the second oil filter according to another embodiment of the present invention with Fig. 6 (b).
Referring to Fig. 5 (a) and Fig. 5 (b) and Fig. 6 (a) and Fig. 6 (b), the second oil filter 420 can have such as Fig. 5 (a) and Fig. 5
(b) structure shown in (hereinafter, " downward emission type ") or (the hereinafter, " row upwards of the structure as shown in Fig. 6 (a) and Fig. 6 (b)
Put type ").In Fig. 5 (a) and Fig. 5 (b) and Fig. 6 (a) and Fig. 6 (b), dotted line indicates fluid flow direction.
Referring to Fig. 5 (a) and Fig. 5 (b) and Fig. 6 (a) and Fig. 6 (b), the second oil filter 420 includes fixed plate 425 and filter
Element 421, and be connected to and flow into pipe 422, delivery pipe 423 and oily delivery pipe 424.
Filter cell 421 is provided to fixed plate 425 so that lubricating oil is separated with the fluid for flowing into pipe 422 is flowed through.
Figure 13 is the plan view of filter cell 421 shown in Fig. 5 (a) and Fig. 5 (b) and Fig. 6 (a) and Fig. 6 (b).Ginseng
See that Figure 13, filter cell 421 there can be hollow (Z-space in Figure 13) cylindrical, wherein more with different grids
A layer overlies one another.In the multiple layers for passing through filter cell 421 via the fluid for flowing into the second oil filter 420 of inflow of pipe 422
While from filtering flow lubricating oil.Filter cell 421 can pass through physical adsorption process separation lubrication oil.
The fluid (fluid of BOG, liquefied gas or vapour-linquid mixure) filtered by filter cell 421 is via discharge
Pipe 423 discharges, and the lubricating oil filtered by filter cell 421 is discharged via oily delivery pipe 424.
The component of second oil filter 420 formed by the material for being able to bear cryogenic conditions so as to make lubricating oil with have it is extremely low
The fluid of temperature separates.Filter cell 421 can be formed by the metal for being able to bear cryogenic conditions, be exactly specific use
Stainless steel (special use stainless, SUS).
Referring to Fig. 5 (a) and Fig. 5 (b), in downward emission type oil filter, via the upper part for being connected to oil filter
It flows into the fluid that pipe 422 is supplied and passes through space (Fig. 5 (a) and the Fig. 5 (b) limited below filter cell 421 and fixed plate 425
X), and then via the low portion for being connected to oil filter delivery pipe 423 discharge.
In downward emission type oil filter, fixed plate 425 is connected to the low portion of oil filter, and filter cell 421 is pacified
Be placed on the upper surface of fixed plate 425, and delivery pipe 423 be connected to oil filter relative to fixed plate 425 and filter cell
421 opposite sides.
In addition, inflow pipe 422 is preferably connected to be positioned in filter cell 421 in downward emission type oil filter
Upper end oil filter so as to allow via flow into pipe 422 flow into oil filter fluid even by filter cell 421
Upper part filtering (that is, to use filter cell as much as possible).
It is preferred that inflow pipe 422 and delivery pipe 423 are placed on opposite side (relative to Fig. 5 for fluid flowing
(a) and on the left and right side of the filter cell 421 in Fig. 5 (b)), and the lubricating oil because being filtered by filter cell 421 is received
Collection is at the downside of oil filter, so preferably oily delivery pipe 424 is connected to the low portion of filter cell 421.
In downward emission type oil filter, oily delivery pipe 424, which may be connected to, is placed in 425 top of fixed plate wait nestle up
Oil filter.
As shown in Fig. 5 (a), when fluid (such as the liquid and 10 volume % of 90 volume % being mainly made of liquid composition
Gas) when being supplied to downward emission type oil filter because the high density of liquid composition generate fluid to flowing down, keep whereby
Good filtering effect.
On the other hand, as shown in Fig. 5 (b), when fluid (such as the liquid and 90 bodies of 10 volume % being made of gaseous component
The gas of product %) when being supplied to downward emission type oil filter, the gaseous component with small density is maintained at the top portion of oil filter
In point, fluid flowing and filtering effect are deteriorated whereby.
Referring to Fig. 6 (a) and Fig. 6 (b), in upward emission type oil filter, via the upper part for being connected to oil filter
It flows into the fluid that pipe 422 is supplied and passes through space (Fig. 6 (a) and the Fig. 6 (b) limited above filter cell 421 and fixed plate 425
Y), and then via the low portion for being connected to oil filter delivery pipe 423 discharge.
In upward emission type oil filter, fixed plate 425 is connected to the upper part of oil filter, and filter cell 421 is pacified
Be placed on the lower surface of fixed plate 425, and delivery pipe 423 be connected to oil filter relative to fixed plate 425 and filter cell
421 opposite sides.
In addition, inflow pipe 422 is preferably connected to be positioned in filter cell 421 in upward emission type oil filter
Lower end below oil filter so as to allow via flow into pipe 422 flow into oil filter fluid even by filter cell 421
Low portion filtering (that is, to use filter cell as much as possible).
It is placed on opposite side for fluid flowing (relative to Fig. 6 it is preferred that flowing into pipe 422 and delivery pipe 423
(a) and on the left and right side of the filter cell 421 in Fig. 6 (b)), and the lubricating oil because being filtered by filter cell 421 is received
Collection is at the downside of oil filter, so preferably oily delivery pipe 424 is connected to the low portion of filter cell 421.
Referring to Fig. 6 (a) and Fig. 6 (b), in upward emission type oil filter, via the low portion for being connected to oil filter
Inflow pipe 422 is supplied to the fluid of oil filter by filter cell 421, and via the row for the upper part for being connected to oil filter
Put the discharge of pipe 423.The lubricating oil filtered by filter cell 421 is discharged via independent pipe 424.
As shown in Fig. 6 (a), when the fluid being mainly made of gaseous component is (for example, the liquid of 10 volume % and 90 volume %
Gas) when being supplied to upward emission type oil filter, generated because of the low-density of gaseous component fluid to upstream, exist whereby
It keeps providing while good filtering effect suitably to upstream.
On the other hand, as shown in Fig. 6 (b), when the fluid being made of liquid composition is (for example, the liquid and 10 of 90 volume %
The gas of volume %) when being supplied to upward emission type oil filter, the lower part of oil filter is maintained at highdensity liquid composition
In part, fluid flowing and filtering effect are deteriorated whereby.
Correspondingly, in the structure at the position B that wherein the second oil filter 420 is placed in Fig. 4, it is preferable that such as Fig. 5
(a) it is used as the second oil filter 420 with downward emission type oil filter shown in Fig. 5 (b), and when the second oil filter 420 disposes
When at the position C of Fig. 4, it is preferable that emission type oil filter is used as second upwards as shown in Fig. 6 (a) and Fig. 6 (b)
Oil filter 420.
It is placed in the structure at the position A in Fig. 4 in wherein the second oil filter 420, pressure is reduced by pressure reducer 600
Fluid is vapour-linquid mixure (theoretically, 100% re-liquefied be possible), and wherein the volume ratio of gaseous component is higher than liquid
The volume ratio of state component.Thus, it is preferable that emission type oil filter is used as the upwards as shown in Fig. 6 (a) and Fig. 6 (b)
Two oil filters 420.
According to embodiment, by-pass line BL forms branch from the first supply pipe line L1 of 100 upstream of heat exchanger to bypass
Heat exchanger 100, and it is joined to the second supply pipe line L2 in 100 downstream of heat exchanger.
In general, the by-pass line around over-heat-exchanger is placed in internal heat exchanger with integrated with heat exchanger.Wherein
By-pass line is placed in the structure of internal heat exchanger, when disposing in the upstream of the heat exchanger and/or the valve in downstream is closed, stream
Body is unable to supply heat exchanger and by-pass line.
In an embodiment of the present invention, by-pass line BL is placed in outside heat exchanger 100 to divide with heat exchanger 100
From, and the second supply pipe for forming branch from the first supply pipe line L1 of 510 upstream of the first valve and being joined to 520 downstream of the second valve
Line L2, so that even if when second valve 520 in 100 downstream of the first valve 510 and/or heat exchanger of 100 upstream of heat exchanger is closed
When, BOG is also sent to by-pass line BL.
Bypass valve 590 is placed on by-pass line BL, and the opening when needing using by-pass line BL.
It substantially, will when not being available heat exchanger 100, such as when heat exchanger 100 breaks down or is overhauled
Use by-pass line BL.For example, if ought the re-liquefied system of BOG according to this embodiment will be compressed by compressor 200
All or part of BOG is not available heat exchanger 100 when being sent to high-pressure engine, then from the edge BOG that reserve tank T is discharged
Be sent directly to compressor 200 around the by-pass line BL of over-heat-exchanger 100, do not used by high-pressure engine without re-liquefied
Superfluous BOG, and the BOG compressed by compressor 200 is sent to GCU in superfluous BOG with the same of the BOG for the surplus of burning
When be supplied to high-pressure engine.
When using by-pass line BL to overhaul heat exchanger 100, such as when the fluid channel of heat exchanger 100 is by through cold
When solidifying or solidification lubricating oil blocking, the lubricating oil for being condensed or being solidified can be removed via by-pass line BL.
In addition, if because seldom superfluous BOG is without re-liquefied BOG (in the ballast conditions of such as ship), then from
By-pass line BL can be transmitted to allow all BOG while around over-heat-exchanger 100 in all BOG of reserve tank T discharge
It is sent directly to compressor 200.It is used as the fuel of high-pressure engine by the BOG that compressor 200 compresses.If because of few surplus
BOG and determination does not need re-liquefied BOG, then bypass valve 590 can be controlled to be automatically turned on.
It was found by the inventors of the present invention that being supplied in BOG via the heat exchanger according to the embodiment with narrow fluid channel
When to engine, BOG because heat exchanger and by serious pressure drop.If you do not need to re-liquefied BOG, then fuel can lead to
Overcompression BOG freely is supplied to engine around over-heat-exchanger incoming flow simultaneously, as described above.
In addition, because also by-pass line BL can be used to carry out re-liquefied BOG not by the increase of the amount of re-liquefied BOG.
It, can when the amount due to BOG increases and needs re-liquefied BOG (that is, re-liquefied rear starting or restarting BOG)
By-pass line BL is sent by all BOG discharged from reserve tank T to allow all BOG around the same of over-heat-exchanger 100
When be sent directly to compressor 200, and the BOG compressed by compressor 200 the hot fluid for being sent to heat exchanger 100 can be led to
Road.Some in the BOG compressed by compressor 200 can be supplied to high-pressure engine.
When the temperature in the zone of heat liberation for starting or restarting the re-liquefied rear heat exchange 100 of BOG passes through above-mentioned mistake
Journey increases the added-time, it is advantageous to which BOG is re-liquefied can may to be retained in heat exchanger removing during previous BOG is re-liquefied
100, start after any lubricating oil for being condensed or being solidified, other residues or the impurity in other equipment, pipeline etc..
Residue may include BOG and lubricating oil, the BOG compressed in previous BOG liquefaction by compressor 200 and with
After be supplied to heat exchanger, and the lubricating oil is mixed with the BOG compressed by compressor 200.
If start or restart BOG it is re-liquefied after from reserve tank T discharge cold BOG direct supply to heat exchanger
100 without via by-pass line BL increase heat exchanger 100 temperature, then from reserve tank T discharge cold BOG hot BOG not
It is sent to the cold fluid pass that heat exchanger 100 is sent in the state of the zone of heat liberation of heat exchanger 100.Therefore, heat is handed over
It can also be cold with the reduction of the temperature of heat exchanger 100 without remaining lubricating oil in condensation or non-curdled appearance in parallel operation 100
Solidifying or solidification.
When the constant temperature specific time period that by-pass line BL is used to increase heat exchanger 100 (if it is determined that through cold
Solidifying or solidification lubricating oil or other impurity are almost removed, then the specific time period can be by the skill of fields
Art personnel determine, and can be about 1 minute to about 30 minutes, preferably about 3 minutes to about 10 minutes, and more preferably about 2 minutes
By about 5 minutes), start BOG liquid again and slowly opening the first valve 510 and the second valve 520 while slowly closing bypass valve 590
Change.As the time further passs, the first valve 510 and the second valve 520 are fully opened, and bypass valve 590 is completely closed to allow
All BOG discharged from reserve tank T are used as the refrigerant for the BOG in re-liquefied heat exchanger 100.
In addition, by-pass line BL can be used to meet the air inlet of compressor 200 when the internal pressure of reserve tank T is lower
Pressure condition.
In addition, if needing the internal pressure by reserve tank T to control for low-pressure, even when the inside of reserve tank T is pressed
Power reduces, it is possible to use by-pass line BL meets the admission pressure condition of compressor 200.
The case for the lubricating oil for being condensed or being solidified using by-pass line BL removal will be focused on by being described below, and stored up
Deposit the case for meeting the admission pressure condition of compressor 200 when the internal pressure of slot T is low using by-pass line BL.
1. the case for the lubricating oil for being condensed or being solidified using by-pass line BL removal
It was found by the inventors of the present invention that because a certain amount of lubricating oil and the glossy slip vapour for having passed through compressor 200
The BOG of cylinder is mixed, and lubricating oil contained in BOG is condensed before the BOG in heat exchanger 100 or solidifies and accumulate on
In heat exchanger 100, so because accumulating on the lubricating oil condensed or solidify in heat exchanger 100 over time
Amount increase and need to remove the lubricating oil for being condensed or being solidified from heat exchanger 100 after predetermined time cycle.
Specifically, although it is contemplated that the pressure and/or flow rate of re-liquefied BOG, re-liquefied efficiency etc., root
Have narrow according to heat exchanger 100 preferably printed circuit heat exchanger (PCHE, also referred to as DCHE), PCHE of this embodiment
Therefore spiral fluid passageways (micro-channel type fluid channel) also have problem, such as be easy the lubricating oil for being condensed or being solidified
Blocking fluid channel, the lubricating oil for being condensed or being solidified are easy accumulation etc. at the spiral section of fluid channel.PCHE
(DCHE is to be manufactured by Kobelko Co., Ltd, Alfalaval Co., Ltd etc..
The lubricating oil for being condensed or being solidified can be removed via following steps:
1) determined whether to remove the time of lubricating oil for being condensed or being solidified；
2) bypass valve 590 is opened, the first valve 510 and the second valve 520 are simultaneously closed off；
3) BOG that by-pass line BL is discharged and passed through from reserve tank T is compressed by compressor 200；
4) heat exchanger 100 is sent by the hot BOG some or all of compressed by compressor 200；
5) gas/liquid separation 700 will be sent to by the BOG of heat exchanger 100；
6) lubricating oil is discharged from gas/liquid separation 700；And
7) determine whether heat exchanger 100 restores normal
1) determined whether to remove and condensed or the step of the time of the lubricating oil that solidifies
In the lubricating oil blocking that the fluid channel of heat exchanger 100 is condensed or solidified, the cooling of heat exchanger 100
Efficiency can reduce.Therefore, if the performance of heat exchanger 100 drops to the preset value of normal performance hereinafter, can so estimate through cold
Solidifying or solidification lubricating oil is with a certain amount of or a greater amount of accumulate in heat exchanger 100.By means of example, if heat exchanger
100 performance drop to about the 50% Dao about 90% of normal performance, preferably about 60% to about 80%, more preferably about 70% or
Less than about 70%, then the time for the lubricating oil for being condensed or being solidified from the removal of heat exchanger 100 is can determine.
Herein, the range of " about 50% to about 90% " of normal performance is comprising about 50% or less than 50%, about 60%
Or less than 60%, about 70% or less than 70%, about 80% or less than 80% and about 90% or all values less than 90%, and
The range of " about 60% to about 80% " of normal performance is comprising about 60% or less than 60%, about 70% or less than 70% and about
80% or all values less than 80%.
When the deterioration of the performance of heat exchanger 100, it is supplied to the cold BOG (L1) of heat exchanger 100 and from heat exchanger 100
The temperature difference between the cold BOG (L4) of discharge increases, and from the hot BOG (L2) of the discharge of heat exchanger 100 and is supplied to heat exchanger
The temperature difference between 100 hot BOG (L3) also increases.In addition, the profit that the fluid channel for working as heat exchanger 100 is condensed or solidified
When lubricating oil blocks, the fluid channel of heat exchanger 100 narrows, and increases front end (L3) and rear end (L4) of heat exchanger 100 whereby
Between pressure difference.
Correspondingly, it is possible to based on the temperature difference for being supplied to heat exchanger 100 or the cold fluid discharged from heat exchanger 100
810, the temperature difference 820,830 and heat exchanger of heat exchanger 100 or the hot fluid discharged from heat exchanger 100 840, are supplied to
The pressure difference 910,920 of 100 zone of heat liberation has determined whether to remove the time of lubricating oil for being condensed or being solidified.
Specifically, if the slave reserve tank T measured such as the first temperature sensor 810 is discharged and is supplied to heat exchanger
The temperature of 100 BOG and as the 4th temperature sensor 840 measure compressed by compressor 200 and cooled down by heat exchanger 100
When the temperature difference (indicating absolute value, hereinafter referred to as " temperature difference of cold flow ") between the temperature of BOG is higher than the normal temperature difference and continues specific
Between period or longer time, then can determine that heat exchange normally executes in heat exchanger 100.
By means of example, when the temperature difference of wherein cold flow is 20 DEG C to 50 DEG C or higher, preferably 30 DEG C to 40 DEG C or higher,
More preferably about 35 DEG C or higher state continue 1 hour or be longer than 1 hour time when, it may be determined that arrived discharge through condensation or
The time of the lubricating oil of solidification.
When 100 normal operating of heat exchanger, there are about 40 DEG C to about 45 by the BOG that compressor 200 is compressed to about 300 bars
DEG C temperature, and discharged from reserve tank T and the BOG with about -160 DEG C to about -140 DEG C of temperature is supplied to heat exchanger 100.
Herein, increase to about -150 DEG C to about -110 DEG C during being delivered to heat exchanger 100 from the temperature of the reserve tank T BOG discharged,
Preferably about -120 DEG C.
In the re-liquefied system of BOG according to this embodiment comprising gas/liquid separation 700, when by gas/liquid separation
When 700 isolated gaseous state BOG are combined with the BOG discharged from reserve tank T and are subsequently supplied into heat exchanger 100, finally it is supplied to
The temperature of the BOG of heat exchanger 100 is lower than the temperature that the BOG of heat exchanger 100 is discharged into from reserve tank T, and is supplied to hot friendship
The temperature of the BOG of parallel operation 100 can be further decreased with being increased by the amount of the isolated gaseous state BOG of gas/liquid separation 700.
Heat exchanger 100 and BOG with about 40 DEG C to 45 DEG C of temperature are supplied to by heat along third supply line L3
Exchanger 100 is cooled to about -130 DEG C to about -110 DEG C, and the temperature difference of cold flow arrives about 3 in normal condition for preferably about 2 DEG C
℃。
In addition, if the slave reserve tank T measured such as second temperature sensor 820 is discharged and is used as system by heat exchanger 100
What the temperature of the BOG of cryogen and such as third temperature sensor 830 measured is compressed by compressor 200 and is supplied to heat exchanger 100
BOG temperature between the temperature difference (indicate absolute value, hereinafter referred to as " temperature difference of hot-fluid ") be higher than the normal temperature difference and continue specific
Time cycle or longer time, then can determine that heat exchange normally executes in heat exchanger 100.
When the temperature difference of wherein hot-fluid is 20 DEG C to 50 DEG C or higher, preferably 30 DEG C to 40 DEG C or higher, more preferably about
When 35 DEG C or higher state continue 1 hour or are longer than 1 hour time, it may be determined that the lubrication for being condensed or being solidified to discharge
The time of oil.
When 100 normal operating of heat exchanger, from reserve tank T discharge and during being delivered to heat exchanger 100 have about-
The BOG of 150 DEG C to about -110 DEG C (preferably about -120 DEG C) of slightly increased temperature can have about -80 DEG C to 40 DEG C of temperature
Degree, this depends on the speed of the ship after the refrigerant being used as in heat exchanger 100, and the refrigeration being used as in heat exchanger 100
Agent and BOG with about -80 DEG C to 40 DEG C of temperature is compressed by compressor 200 with the temperature with about 40 DEG C to about 45 DEG C.
In addition, if as what first pressure sensor 910 measured is compressed by compressor 200 and is supplied to heat exchanger 100
The pressure of BOG and the temperature of the BOG cooled down by heat exchanger 100 measured such as second pressure sensor 920 between pressure
Poor (hereinafter referred to as " pressure difference of zone of heat liberation ") is higher than normal pressure difference and continues specific time period or longer time, that
It can determine that heat exchanger 100 abnormally operates.
Because of the time that the BOG discharged from reserve tank T is not mixed with oil or the oil with trace and lubricating oil are mixed with BOG
Point is when BOG is compressed by compressor 200, so the lubricating oil for being condensed or being solidified does not accumulate on heat exchanger 100 substantially
In the cold fluid pass of (it will be used as refrigerant from the BOG that reserve tank T is discharged and BOG is then supplied to compressor 200)
And it accumulates in the zone of heat liberation of heat exchanger 100, wherein the BOG compressed by compressor 200 is cooling and be supplied to and subtract
Depressor 600.
Accordingly, because fluid channel is stopped and is caused the front end of heat exchanger 100 by the lubricating oil for being condensed or being solidified
Pressure difference between rear end quicklys increase in zone of heat liberation, so passing through the zone of heat liberation of measurement heat exchanger 100
Pressure determined whether to remove the time of lubricating oil for being condensed or being solidified.
It, can be in view of can be used as the heat exchanger according to this embodiment with narrow and spiral fluid passageways PCHE
Be advantageously used about the pressure difference between the front-end and back-end based on heat exchanger 100 determined whether remove through condensation or
The time of the lubricating oil of solidification.
By means of example, when the pressure difference of zone of heat liberation is twice or twice or more of its normal pressure difference and continues 1
Hour or when being longer than 1 hour time, it may be determined that the time for the lubricating oil for being condensed or being solidified to discharge.
When 100 normal operating of heat exchanger, about 0.5 bar to about 2.5 bars of the BOG experience compressed by compressor 200, preferably
About 0.7 bar to about 1.5 bars of ground, more preferably about 1 bar of pressure drop, even if cooling while passing through heat exchanger 100 in BOG
When will not be by significant pressure drop.When the pressure difference of wherein zone of heat liberation is at least predetermined pressure or higher, such as 1 bar
When to 5 bars or higher, preferably 1.5 bars to 3 bars or higher, more preferably about 2 bars (200kPa) or higher, it may be determined that arrived row
Put the time of lubricating oil for being condensed or being solidified.
Although can appoint in the pressure difference of the temperature difference based on cold flow, the temperature difference of hot-fluid and zone of heat liberation as described above
One determination is used to remove the time point of lubricating oil for being condensed or being solidified, but can the temperature difference based on cold flow, the temperature difference of hot-fluid and
At least two in the pressure difference of zone of heat liberation determine for remove condensed or time point of lubricating oil for solidifying so as to
Improve reliability.
By means of example, when lower between the temperature difference of maintenance cold flow and the temperature difference of hot-fluid under 35 DEG C or higher temperature
Value continue 1 hour or be longer than 1 hour time when, when the pressure difference of zone of heat liberation be its normal pressure difference twice or more
High or 200kPa or higher and when continuing 1 hour or being longer than 1 hour time, it may be determined that removing the profit for being condensed or being solidified
The time of lubricating oil.
First temperature sensor 810, second temperature sensor 820, third temperature sensor 830, the 4th temperature sensor
840, first pressure sensor 910 and second pressure sensor 920 can be considered as detecting whether heat exchanger 100 is lubricated
The detection means of oil blocking.
In addition, the re-liquefied system of the BOG of embodiment according to the present invention can further include controller (not shown) with base
In the first temperature sensor 810, second temperature sensor 820, third temperature sensor 830, the 4th temperature sensor 840,
The testing result that at least one of one pressure sensor 910 and second pressure sensor 920 obtain determines whether heat exchanger
100 are blocked by lubricating oil.Controller can be considered as the determination component whether blocked by lubricating oil for determining heat exchanger 100.
2) the step of bypass valve 590 simultaneously closes off the first valve 510 and the second valve 520 is opened
If determining the time to the lubricating oil for being condensed or being solidified from the removal of heat exchanger 100 in step 1,
It is placed in bypass valve 590 on by-pass line BL to open, and the first valve 510 for being placed on first supply pipe line L1 and is placed in
The second valve 520 on second supply pipe line L2 is closed.
When bypass valve 590 opening simultaneously close off the first valve 510 and the second valve 520 when, from reserve tank T discharge BOG via
By-pass line BL is sent to compressor 200, and is prevented from being supplied to heat exchanger 100.Therefore, refrigerant is not supplied to hot friendship
Parallel operation 100.
3) the step of discharging from reserve tank T and passed through the BOG of by-pass line BL, is compressed by compressor 200
The BOG discharged from reserve tank T around over-heat-exchanger 100 and is subsequently sent to compressor 200 via by-pass line BL.
The BOG for being sent to compressor 200 undergoes the increase of temperature and pressure while being compressed by compressor 200.It is pressed by compressor 200
Being reduced to about 300 bars of BOG has about 40 DEG C to about 45 DEG C of temperature.
4) the step of sending heat exchanger 100 for the hot BOG some or all of compressed by compressor 200
When the BOG compressed by compound compressor 200 is continuously supplied to heat exchanger 100, it is used as in heat exchanger 100
Refrigerant and be not supplied to heat exchanger 100 from the cold BOG that reserve tank T is discharged, and hot BOG is continuously supplied to hot friendship
Thus parallel operation 100 increases the temperature of the zone of heat liberation of heat exchanger 100 step by step, is passed through by the BOG that compressor 200 compresses
The zone of heat liberation transmission.
When the temperature of the zone of heat liberation of heat exchanger 100 exceeds condensation or the freezing point of lubricating oil, hot friendship is accumulated on
The lubricating oil for being condensed or being solidified in parallel operation 100 gradually melt or viscosity reduce, and then melt or have low-viscosity
Lubricating oil mixed with BOG and exit heat exchanger 100.
When the lubricating oil for being condensed or being solidified using by-pass line BL removal, BOG circulates through by-pass line BL, compression
Machine 200, the zone of heat liberation of heat exchanger 100, pressure reducer 600 and gas/liquid separation 700 are until heat exchanger 100 restores just
Often.
In addition, being discharged from reserve tank T when removing the lubricating oil of condensation or solidification using by-pass line BL and passing through bypass
Pipeline BL, compressor 200, the zone of heat liberation of heat exchanger 100 and pressure reducer 600 BOG can be transmitted and separated with reserve tank T
Single slot or another collecting mechanism, wherein BOG with melting or viscosity reduce lubricating oil mix.It is stored in single slot or another
BOG in one collecting mechanism is sent to by-pass line BL to continue to remove the process of lubricating oil for being condensed or being solidified.
Even if being placed in the structure in the downstream of pressure reducer 600 in wherein gas/liquid separation 700, when by with melting or
When the fluid of the BOG composition for the lubricating oil mixing that viscosity reduces is sent to single slot or other collecting mechanisms, gas/liquid separation
700 also provide function identical with the function of the re-liquefied system of typical case BOG, and lubricating oil melt or that viscosity reduces is not received
(lubricating oil melting or that viscosity reduces is by the single slot or other receipts that separate with reserve tank T in gas/liquid separation 700 for collection
Collecting mechanism is collected).Therefore, the re-liquefied system of BOG according to this embodiment can omit the gas/liquid point for being configured to discharge lubricating oil
From device, realizes reduce cost whereby.
5) by gas/liquid separation 700 are sent to by the BOG of heat exchanger 100 the step of
Temperature with the zone of heat liberation of heat exchanger 100 increases, and accumulates on being condensed in heat exchanger 100 or coagulates
Solid lubricating oil melt step by step or viscosity reduces, and gas/liquid separation 700 is then sent to after mixing with BOG.It is passing through
During removing the lubricating oil for being condensed or being solidified in heat exchanger 100 by by-pass line BL, because BOG is not re-liquefied,
So re-liquefied gas is not collected by gas/liquid separation 700, and collect the lubricating oil of BOG and melting or low-viscosity.
The gaseous state BOG collected in gas/liquid separation 700 along the 6th feed line L6 from gas/liquid separation 700 discharge and
Compressor 200 is sent to along by-pass line BL.Because the first valve 510 is closed in step 2, by gas/liquid separation 700
Isolated gaseous state BOG with from reserve tank T discharge and combine along the BOG that by-pass line BL is sent to compressor 200, without transmission
To the cold fluid pass of heat exchanger 100.
It will be supplied to by the isolated gaseous state BOG of gas/liquid separation 700 in the case where the first valve 510 is in close state
By-pass line BL can prevent from lubricating oil contained in BOG being supplied to heat exchanger 100, prevent from stopping heat exchanger whereby
100 cold fluid pass.
The gaseous state BOG wherein collected in gas/liquid separation 700 is along the 6th feed line L6 from 700 row of gas/liquid separation
It puts and continues then along the by-pass line BL cyclic process for sending back to compressor 200, until determining the heat of heat exchanger 100
The temperature of fluid channel increases to the temperature for being compressed by compressor 200 and being sent to the BOG of zone of heat liberation of heat exchanger 100
Degree.However, cyclic process is sustainable to pass by time enough until being empirically determined.
Removed using by-pass line BL from heat exchanger 100 condensed or the lubricating oil that solidifies during, the 8th valve 581 closes
It closes to prevent the lubricating oil collected in gas/liquid separation 700 from flowing to reserve tank T along the 5th supply line L5.If lubrication
Oil is introduced into reserve tank T, then the purity for the liquefied gas being stored in reserve tank T may deteriorate, deteriorates liquefied gas whereby
Value.
6) the step of discharging lubricating oil from gas/liquid separation 700
The lubricating oil melting discharged from heat exchanger 100 or that viscosity reduces is collected in gas/liquid separation 700.For
The lubricating oil collected in processing gas/liquid separation 700, the re-liquefied system of BOG according to this embodiment can be used passes through improvement
Typical gas/liquid separation and the gas/liquid separation 700 obtained.
Figure 10 is the enlarged view of heat exchanger and gas/liquid separation according to an embodiment of the invention.In Figure 10
In, some components are omitted for the convenience of description.
Referring to Figure 10, gas/liquid separation 700 has: Grease relief pipeline OL, the profit collected in gas/liquid separation 700
Lubricating oil is via its discharge；And the 5th supply line L5, storage is sent to via it by the isolated liquefied gas of gas/liquid separation 700
Deposit slot T.The lubricating oil collected at low portion in order to allow effectively to discharge gas/liquid separation 700, Grease relief pipeline
OL is connected to the lower end of gas/liquid separation 700, and one end of the 5th supply line L5 is placed in the company in gas/liquid separation 700
It is connected to above the lower end of the gas/liquid separation 700 of Grease relief pipeline OL.The 5th supply line L5 is by lubricating oil in order to prevent
Blocking, it is preferable that the 5th supply line L5 when the amount for the lubricating oil collected in gas/liquid separation 700 reaches maximum value
End is placed in above the liquid level of lubricating oil.
Flow rate for adjusting fluid can be placed in lubricating oil with the third valve 530 opened/closed for corresponding to pipeline
On discharge pipe line OL, and it can provide multiple.
Because the lubricating oil collected in gas/liquid separation 700 can discharge naturally or may need to discharge for a long time, institute
With the lubricating oil in gas/liquid separation 700 can be rinsed via nitrogen and be discharged.When nitrogen is supplied under about 5 bars of pressure to 7 bars
When should arrive gas/liquid separation 700, the internal pressure of gas/liquid separation 700 increases and allows the quick drain of lubricating oil.
In order to via nitrogen rinse from gas/liquid separation 700 discharge lubricating oil, nitrogen supply (NS) pipeline NL may be disposed so as to
It is joined to the third supply line L3 of 100 upstream of heat exchanger.Several nitrogen feed lines can be placed in different location as needed
Place.
Flow rate for adjusting fluid can be placed in nitrogen with the nitrogen valve 583 opened/closed for corresponding to pipeline and supply
It answers on pipeline NL, and is normally kept in off position when not using nitrogen supply (NS) pipeline NL.Then, when needing using nitrogen tube
When nitrogen supply (NS) is used for nitrogen flushing to gas/liquid separation 700 by line NL, nitrogen valve 583 is opened.There can be multiple nitrogen valves
583。
Although can be rinsed and being directly injected into nitrogen in gas/liquid separation 700 via nitrogen and execute lubricating oil
Discharge, but if having installed nitrogen supply (NS) pipeline for other purposes, then it is preferred that using may be previously for it
The nitrogen supply (NS) pipeline of another installation of its purpose placement discharges lubricating oil from gas/liquid separation 700.
By the BOG discharged from reserve tank T be all sent to by-pass line BL with by compressor 200 compression, will be by pressing
Contracting machine 200 compress BOG be sent to heat exchanger 100 zone of heat liberation, will be by exchanger 100 and in pressure reducer 600
The BOG for reducing pressure is sent to gas/liquid separation 700, and sends by-pass line for the BOG discharged from gas/liquid separation 700
After the process of BL, if it is determined that most of lubricating oil for being condensed or being solidified are collected in gas/liquid separation in heat exchanger 100
In 700 (that is, if it is determined that heat exchanger 100 restores normal), then the BOG compressed by blocking by compressor 200
Inflow heat exchanger 100 and open nitrogen valve 583 come execute nitrogen rinse.
7) determine whether heat exchanger 100 restores normal step
If it is determined that heat exchanger 100 restores again via the lubricating oil for discharging condensation or solidification from heat exchanger 100
Normally, and when the process for discharging lubricating oil from gas/liquid separation 700 is completed, by opening the first valve 510 and the second valve 520
Simultaneously close off the re-liquefied system of normal operating BOG again of bypass valve 590.When the re-liquefied systems in operation of BOG, from reserve tank
The BOG of T discharge is used as the refrigerant in heat exchanger 100, and some or all of the refrigerant being used as in heat exchanger 100
BOG is re-liquefied via the compression of compressor 200, the cooling of heat exchanger 100 and the decompression of pressure reducer 600.
It is condensed with having determined whether to remove or as time of lubricating oil for solidifying, whether determines heat exchanger 100
Restore to be normally at least one of the temperature difference, the temperature difference of hot-fluid and the pressure difference of zone of heat liberation based on cold flow again.
Other than the lubricating oil for being condensed or being solidified inside heat exchanger 100, it can also be removed via the above process
Accumulate on the lubricating oil condensed or solidify in pipeline, valve, instrument and other equipment.
Routinely, in the step for removing the lubricating oil for being condensed or being solidified inside heat exchanger 100 using by-pass line BL
During rapid, high-pressure engine and/or low compression engine (hereinafter referred to as " engine ") can be driven.Fuel is included in maintenance to supply
After a part of system or the equipment in re-liquefied system, because fuel is unable to supply engine or the BOG of surplus can not be again
Liquefaction, so engine is generally in non-driving condition.
On the contrary, if as engine can be in the lubricating oil for being condensed or being solidified from the removal of heat exchanger 100 in the present invention
Period driving, then as it is possible that heat exchanger 100 is overhauled during the operation of engine, so there are following advantages: having
It boat and power may be generated and removed using superfluous BOG is condensed or is solidified during the maintenance of heat exchanger 100
Lubricating oil.
In addition, when removed from heat exchanger 100 condensed or the lubricating oil that solidifies during drive engine when, exist with
Lower advantage: it is possible that burning by the lubricating oil mixed during the compression of compressor 200 with BOG.That is, not only using engine
It is the purpose for boat or generation power, and for removing the oil mixed with BOG.
On the other hand, based on whether the process that the alarm of the time for the lubricating oil for being condensed or being solidified to removal determines can
Comprising 1. alarm activation step, and/or 2., alarm generates step.In an embodiment of the present invention, alarm is as notification unit
Example illustrate.
Fig. 7 is the schematic diagram of the re-liquefied system of BOG of fourth embodiment according to the present invention, and Fig. 8 is according to the present invention
The enlarged view of the pressure reducer of one embodiment, and Fig. 9 is the enlarged view of pressure reducer according to another embodiment of the present invention.
Referring to Fig. 7, two compressors 200,210 can be arranged in parallel in the present invention.Described two compressors 200,210 can
With same size, and it may act as the spare failure with for any of prevention compressor and prepare.For the convenience of description
Omit the explanation of other devices.
Referring to Fig. 7, in the structure of wherein compressor 200,210 parallel arrangement, the BOG that discharges from reserve tank T is via the
Seven supply line L22 are sent to the second compressor 210, and the BOG compressed by the second compressor 210 is via fuel supply lines SL
Partial discharge is to high-pressure engine, and superfluous BOG is sent to heat exchanger 100 via the 8th supply line L33 to undergo again
Liquefaction process.The tenth valve 571 opened/closed for adjusting flow rate and corresponding pipeline can be placed in the 8th supply line
On L33.
In other embodiments, two pressure reducers 600,610 can be arranged in parallel as shown in Figure 8, and two pairs of arranged in series
Pressure reducer 600,610 can be arranged in parallel as shown in Figure 9.
Referring to Fig. 8, two pressure reducers 600,610 of parallel arrangement may act as spare for any of prevention compressor
Failure prepare, and each of pressure reducer 600,610 can be such that mode of the isolating valve 620 at its front and back end provides.
Referring to Fig. 9, two pairs of pressure reducers 600,610 of series connection are arranged in parallel.Depending on manufacturer, two pressure reducers
600 are connected in series to realize decompression stability.The two pairs of pressure reducers 600,610 being connected in parallel may act as spare with any to prevent
It prepares to the failure of pressure reducer.
Each of pressure reducer 600,610 being connected in parallel can be such that mode of the isolating valve 620 at its front and back end mentions
For.Isolating valve 620 shown in Fig. 8 and Fig. 9 because pressure reducer 600,610 failure etc. and safeguard or maintenance pressure reducer 600
Pressure reducer 600 is isolated at once afterwards.
1. the step of alarm activation
In the structure that the re-liquefied system of wherein BOG includes a compressor 200 as shown in Figure 2 and a pressure reducer 600,
Activate alarm under the following conditions: the degree that pressure reducer 600 is opened is preset value or higher, and the 7th valve 570 and the second valve 520 are beaten
It opens, and the liquid level of liquefied gas is normal level in gas/liquid separation 700.
It is connected in parallel in the re-liquefied system of wherein BOG comprising a compressor 200 as shown in Figure 2 and as shown in Figure 8
In the structure of two pressure reducers 600,610, alarm is activated under following condition (hereinafter referred to as " the first alarm activation condition "):
The degree that one pressure reducer 600 or the second pressure reducer 610 are opened is preset value or higher, and the 7th valve 570 and the second valve 520 are opened,
And the liquid level of the liquefied gas in gas/liquid separation 700 is normal level.
It is connected in parallel in the re-liquefied system of wherein BOG comprising a compressor 200 as shown in Figure 2 and as shown in Figure 9
In the structure of two pairs of pressure reducers 600,610, alarm is activated under following condition (hereinafter referred to as " the second alarm activation condition "): string
Join arrangement two the first pressure reducers 600 in one or be connected in series two the second pressure reducers 610 in one opening
Degree is preset value or higher, and the 7th valve 570 and the second valve 520 are opened, and the liquid level of liquefied gas is in gas/liquid separation 700
Normal level.
It include two compressors 200,210 for being connected in parallel as shown in Figure 7 and as shown in Figure 2 in the re-liquefied system of BOG
In the structure of one pressure reducer 600, alarm is activated under following condition (hereinafter referred to as " third alarm activation condition "): pressure reducer
600 degree opened are preset value or higher, and the 7th valve 570 or the tenth valve 571 are opened, and the second valve 520 is opened, and gas/liquid point
Liquid level from the liquefied gas in device 700 is normal level.
It include two compressors 200,210 for being connected in parallel as shown in Figure 7 and such as Fig. 8 institute in the re-liquefied system of wherein BOG
In the structure for showing two pressure reducers 600,610 being connected in parallel, in following condition (hereinafter referred to as " the 4th alarm activation condition ")
Lower activation alarm: the degree that the first pressure reducer 600 or the second pressure reducer 610 are opened is preset value or higher, the 7th valve 570 or the
Ten valves 571 are opened, and the second valve 520 is opened, and the liquid level of liquefied gas is normal level in gas/liquid separation 700.
It include two compressors 200,210 for being connected in parallel as shown in Figure 7 and such as Fig. 9 institute in the re-liquefied system of wherein BOG
In the structure for showing the two pairs of pressure reducers 600,610 being connected in parallel, in following condition (hereinafter referred to as " the 5th alarm activation condition ")
Lower activation alarm: in one in two the first pressure reducers 600 of arranged in series or two the second pressure reducers 610 being connected in series
The degree of an opening be preset value or higher, the 7th valve 570 or the tenth valve 571 are opened, and the second valve 520 is opened, and gas/liquid
The liquid level of liquefied gas is normal level in separator 700.
In the above-described first to the 5th alarm activation condition, the first pressure reducer 600 or the second pressure reducer 610 are predetermined
Opening degree can be 2%, and in gas/liquid separation 700 normal level of liquefied gas mean can by confirm gas liquid separation
Re-liquefied gas and the determining case for normally having carried out re-liquefied process in device 700.
2. the step of alarm generates
Alarm be can produce if meeting any of the following conditions to indicate for removing the profit for being condensed or being solidified
The time point of lubricating oil: the temperature difference of cold flow is preset value or higher and the predetermined hold-time period condition, the temperature difference of hot-fluid are pre-
If value or higher and the predetermined hold-time period condition and the pressure difference of zone of heat liberation are preset value or higher and continue
The condition of predetermined period of time.
In order to improve reliability, alarm can produce if meeting at least two in the following conditions to indicate for removing
The time point of lubricating oil for being condensed or being solidified: the temperature difference of cold flow is preset value or higher and the predetermined hold-time period item
Part, hot-fluid the temperature difference be preset value or higher and the predetermined hold-time period condition and the pressure difference of zone of heat liberation are
Preset value or higher and the predetermined hold-time period condition.
In addition, if the lower value in the temperature difference of cold flow and the temperature difference of hot-fluid is preset value or higher and predetermined hold-time
Period (or condition), or if zone of heat liberation pressure difference be preset value or higher and predetermined hold-time period, can
Alarm is generated to indicate for removing the time point of lubricating oil for being condensed or being solidified.
According to the present invention, exception, the alarm generation etc. of heat exchanger can be determined by suitable controller.As for determining
The controller of exception, the alarm generation of heat exchanger etc., can be used the control used by the re-liquefied system of BOG according to the present invention
Device, the controller that the ship or offshore structure being preferably applied to by the re-liquefied system of BOG according to the present invention use, and can also make
With for determining the separate controller of the exception of heat exchanger, generation of alarm etc..
In addition, the use of by-pass line, the discharge of lubricating oil, opening to the fuel supply of engine, BOG re-liquefied system
Begin or restart, and opening or closing for the various valves for these components can be by the controller automatically or manually
Control.
2. meeting the admission pressure item of compressor 200 using by-pass line BL when the internal pressure of reserve tank T is low
The case of part
Cause in the case that reserve tank T has low internal pressure, such as because of a small amount of liquefied gas in reserve tank T
Lead to be supplied to engine when the amount of generated BOG is less or in the high speed because of ship with the amount of the BOG for boat
When larger, compressor 200 is usually unsatisfactory for the admission pressure condition of the upstream of compressor 200.
Specifically, in the PCHE (DCHE) for being used as heat exchanger 100, pass through in the BOG discharged from reserve tank T
When PCHE, cause pressure drop larger because of its narrow fluid channel.
Routinely, when compressor 200 is not able to satisfy admission pressure condition, recycle valve 541,542,543,544 is opened
Compressor 200 is protected to pass through recirculation line RC1, RC2, RC3, RC4 by recycle sections or the BOG of whole.
However, being compressed if meeting the admission pressure condition of compressor 200 by recycling BOG by compressor 200
The amount of BOG reduce, cause re-liquefied performance to deteriorate whereby and be not able to satisfy the fuel consumption requirement of engine.Specifically,
If engine is unsatisfactory for fuel consumption requirement, the operation of ship may be significantly interfered with.Even if therefore, it is necessary to store
The internal pressure of slot T also can satisfy the BOG that the admission pressure condition of compressor and the fuel consumption of engine require when being low
Method of re-liquefaction.
According to the present invention, it is provided for safeguarding and overhaul even if can also be used when the internal pressure of reserve tank T is low
The by-pass line BL of heat exchanger 100 meets the admission pressure condition of compressor 200, is compressed by compressor 100 without reducing
BOG amount, without provide extras.It is possible that suction pressure condition needed for meeting compressor 200, without reducing
The amount of BOG.
According to the present invention, when the internal pressure of reserve tank T is reduced to preset value or is less than preset value, bypass valve 590 is beaten
It opens to allow the BOG from some or all of reserve tank T discharge to directly transmit via the by-pass line BL around over-heat-exchanger 100
To compressor 200.
It is sent to the pressure and air inlet pressure needed for compressor 200 that the amount of the BOG of by-pass line BL may depend on reserve tank T
Power condition is relatively adjusted.That is, all BOG discharged from reserve tank T can simultaneously close off the by opening bypass valve 590
One valve 510 and the second valve 520 and be sent to by-pass line BL, or more only from reserve tank T discharge BOG can be transmitted to shunt valve
Line BL, and residue BOG can be sent to heat exchanger and partially opening bypass valve 590, the first valve 510 and the second valve 520
100.That is, all BOG discharged from reserve tank T can simultaneously close off the first valve 510 and second by opening bypass valve 590
Valve 520 and be sent to by-pass line BL, or more only can be transmitted from the BOG that reserve tank T is discharged to by-pass line BL, and remaining
BOG can be sent to heat exchanger 100 and partially opening bypass valve 590, the first valve 510 and the second valve 520.The pressure of BOG
Drop reduces with increasing via by-pass line BL around the amount of the BOG of over-heat-exchanger 100.
Although having when the BOG discharged from reserve tank T is around over-heat-exchanger 100 and is sent directly to compressor 200 makes
The advantages of minimized pressure drop, but the cold and hot amount of BOG cannot be used for re-liquefied BOG.Therefore, the inside pressure based on reserve tank T
Power, the fuel consumption of engine require, to amount of re-liquefied BOG etc. come determine using by-pass line BL with reduce pressure drop with
And the amount from the BOG for being sent to by-pass line BL in the amount of the reserve tank T BOG discharged.
By means of example, it may be determined that do so and be advantageous: when the internal pressure of reserve tank T is preset value or is less than default
Value and subtract lower pressure drop using by-pass line BL when ship operates under predetermined speed or higher speed.Specifically, it may be determined that
It does so and is advantageous: when the internal pressure of reserve tank T is 1.09 bars or is 17 sections less than the speed of 1.09 bars and ship or higher
When using by-pass line BL reduce pressure drop.
In addition, even if also being passed through when all BOG discharged from reserve tank T are sent to compressor 200 via by-pass line BL
It is not often able to satisfy the admission pressure condition of compressor 200.It is full using recirculation line RCl, RC2, RC3, RC4 in this case
Sufficient admission pressure condition.
That is, leading to the admission pressure condition for not being able to satisfy compressor 200 in the pressure reduction because of reserve tank T
When, compressor 200 is protected using recirculation line RC1, RC2, RC3, RC4 in the related art, however according to the present invention, it is
The admission pressure condition for meeting compressor 200 mainly uses by-pass line BL, and even by by all from storage
It is secondary when can not meet the admission pressure condition of compressor 200 that the BOG of slot T discharge is sent to compressor via by-pass line BL
Ground uses recirculation line RC1, RC2, RC3, RC4.
It is mainly used using by-pass line BL and secondary strategic point and is followed again to meet the admission pressure condition of compressor 200
Endless tube line RC1, RC2, RC3, RC4, when bypass valve 590 is opened locating pressure condition be configured to than recycle valve 541,542,
543, locating pressure condition high value when 544 open.
The condition locating when opening of recycle valve 541,542,543,544 and bypass valve 590 condition locating when opening are excellent
Selection of land is determined based on the pressure of 200 upstream of compressor.Alternatively, these conditions can be determined based on the internal pressure of reserve tank T.
The pressure of 200 upstream of compressor can be surveyed by be placed in the third pressure sensor of 200 upstream of compressor (not shown)
Amount, and the internal pressure of reserve tank T can be by the measurement (not shown) of the 4th pressure sensor.
On the other hand, wherein for discharging by the 6th supply line L6 of the isolated gaseous state BOG of gas/liquid separation 700
First supply pipe line is joined at the position in the branch point downstream that the slave first supply pipe line L1 of by-pass line BL forms branch
In the structure of L1, heat exchanger can be operated as by following from some BOG that reserve tank T is discharged while preventing pressure drop
Refrigerant in 100: by-pass line BL will be sent directly to by the isolated gaseous state BOG of gas/liquid separation 700, wherein all sides
Road valve 590, the first valve 510 and the second valve 520 are opened in the operation of system.
Because being lower than by the temperature of the isolated gaseous state BOG of gas/liquid separation 700 from reserve tank T discharge and being supplied to hot friendship
The temperature of the BOG of parallel operation 100, and the cooling efficiency of heat exchanger 100 may be in the gaseous state BOG isolated by gas/liquid separation 700
It is sent directly to deterioration when by-pass line BL, so it is preferred that at least some gaseous state BOG separated by gas/liquid separation 700
It is sent to heat exchanger 100.
Herein, if the amount of the BOG generated in reserve tank T is less than the amount of the BOG as fuel needed for engine,
Possibility need not re-liquefied BOG.However, when not needing re-liquefied BOG, all gaseous state BOG for being separated by gas/liquid separation 700
By-pass line BL can be transmitted, because need not be by cold-producing medium supply to heat exchanger 100.
Correspondingly, in the present invention, the 6th supply line L6 is formed in the slave first supply pipe line L1 of by-pass line BL and is divided
First supply pipe line L1 is joined at the position of the branch point upstream of branch.In wherein the 6th supply line L6 dividing in by-pass line
Fulcrum upstream is joined in the structure of first supply pipe line L1, is separated from the reserve tank T BOG discharged and by gas/liquid separation 700
Gaseous state BOG be combined with each other at the position of the branch point upstream of by-pass line BL, and be then dependent on bypass valve 590 and first
The degree that valve 510 is opened determines the amount for being sent to the BOG of by-pass line BL and heat exchanger 100, is easy to control system whereby,
And it prevents from being sent directly to by-pass line BL by the isolated gaseous state BOG of gas/liquid separation 700.
Preferably, bypass valve 590 is to provide the valve of higher response than typical valve, to allow the pressure depending on reserve tank T
Power changes the degree for quickly adjusting and opening.
Fig. 3 is the schematic diagram of the re-liquefied system of BOG of third embodiment according to the present invention.
Referring to Fig. 3, the re-liquefied system of the BOG of third embodiment according to the present invention is different from according to figure 1 first
The re-liquefied system of the BOG of embodiment, the difference is that: the re-liquefied system of BOG according to the third embodiment is passed comprising pressure difference
Sensor 930 replace first pressure sensor 910 and second pressure sensor 920, and be described below will focus on according to third reality
Apply the different characteristic of the re-liquefied system of BOG of example.The description of component identical with the re-liquefied system of BOG according to first embodiment
It will omit.
Different from first embodiment, the re-liquefied system of BOG according to the third embodiment includes measurement 100 upstream of heat exchanger
100 downstream third supply line L3 and heat exchanger the 4th supply line L4 between pressure difference pressure difference transducer
930, rather than first pressure sensor 910 and second pressure sensor 920.
The pressure difference of zone of heat liberation can be obtained by pressure difference transducer 930, and as in the first embodiment, can be based on heat
At least one of the pressure difference of fluid channel, the temperature difference of cold flow and temperature difference of hot-fluid, which have determined whether to remove, to be condensed or is coagulated
Solid lubricating oil time.
It will be apparent to those skilled in the art that the present invention is not limited to the above embodiments and can not depart from this hair
It carry out various modifications, change in the case where bright spirit and scope, changing and equivalent embodiment.
Claims (45)
1. a kind of method from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that the boil-off gas is re-liquefied
System be configured to pass the boil-off gas as described in compressor compresses, by heat exchanger via with the unpressed boil-off gas
The cooling compressed boil-off gas of heat exchange, and by pressure reducer reduce via the pressure of the cooling fluid of heat exchange Lai
The re-liquefied boil-off gas,
Wherein the boil-off gas of the refrigerant wait be used as in the heat exchanger is supplied to the heat along first supply pipe line and hands over
Parallel operation,
The boil-off gas as the refrigerant in the heat exchanger is supplied to the pressure along second supply pipe line
Contracting machine, and
The boil-off gas of the refrigerant in the heat exchanger is not used as along the bypass for bypassing the heat exchanger
Pipeline is supplied to the compressor, and
Wherein the flow rate for adjusting fluid and the bypass valve opened/closed for corresponding to supply line are placed in the bypass
On pipeline,
Flow rate for adjusting fluid is placed in first supply with the first valve opened/closed for corresponding to supply line
In the upstream of the heat exchanger on pipeline,
Flow rate for adjusting fluid is placed in second supply with the second valve opened/closed for corresponding to supply line
In the downstream of the heat exchanger on pipeline, and
The compressor includes at least one glossy slip cylinder,
The described method includes:
2) it opens the bypass valve and simultaneously closes off first valve and second valve；
3) it sends the boil-off gas for the refrigerant being not used as in the heat exchanger to along the by-pass line
The compressor, then by the compressor compresses；And
4) heat exchanger will be sent to by the boil-off gas of some or all of the compressor compresses,
Condensed or the lubricating oil that solidifies after melting or viscosity reduce by being increased by temperature during the compressor compresses
The boil-off gas from the boil-off gas re-liquefied system discharge.
2. the method according to claim 1 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that into one
Step includes:
1) time of the removal lubricating oil for being condensed or being solidified has been determined whether before step 2.
3. the method according to claim 1 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that in institute
State boil-off gas it is re-liquefied after, be separated from each other by the liquefied gas and gaseous state boil-off gas of re-liquefied generation by gas/liquid separation,
The liquefied gas separated by the gas/liquid separation is discharged along the 5th supply line from the gas/liquid separation, and by institute
The gaseous state boil-off gas for stating gas/liquid separation separation is discharged along the 6th supply line from the gas/liquid separation,
The method further includes:
5) gas/liquid separation is sent by the boil-off gas by the heat exchanger；And
6) discharge accumulates on the lubricating oil in the gas/liquid separation.
4. the method according to claim 3 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that in step
It is rapid 5) in be sent to the boil-off gas of the gas/liquid separation and be sent to the shunt valve along the 6th supply line
Line is to be subjected to the compression in step 3).
5. the method according to claim 4 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that repeat
Step 3) arrives step 5), until the temperature of the zone of heat liberation of the heat exchanger increases to by the compressor compresses and transmission
To the temperature of the boil-off gas of the heat exchanger.
6. the method according to claim 1 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that in step
It is rapid 4) in, fuel is used as by engine by the boil-off gas of the compressor compresses, and do not used by the engine
Superfluous boil-off gas is sent to the heat exchanger.
7. the method according to claim 2 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that in step
It is rapid 1) in, if meeting at least one of the following conditions determine arrived the discharge lubricating oil for being condensed or being solidified when
Between:
To the boil-off gas of the heat exchanger upstream as the refrigerant in the heat exchanger and by described
The temperature difference (hereinafter referred to as " temperature difference of cold flow ") between compressor compresses and the boil-off gas cooled down by the heat exchanger
For the first preset value or greater than the first preset value and the condition in predetermined hold-time period or longer time；
The boil-off gas as the refrigerant in the heat exchanger and by the compressor compresses and it is sent to institute
It is first preset value or big for stating the temperature difference (hereinafter referred to as " temperature difference of hot-fluid ") between the boil-off gas of heat exchanger
In first preset value and the condition in predetermined hold-time period or longer time；And
The evaporation of the heat exchanger is sent to by the compressor compresses and in the position of the heat exchanger upstream
Pressure difference between gas and the boil-off gas cooled down at the position in the heat exchanger downstream by the heat exchanger
(hereinafter referred to as " pressure difference of zone of heat liberation ") is the second preset value or is greater than the second preset value and predetermined hold-time period
Or the condition of longer time.
8. the method according to claim 2 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that in step
It is rapid 1) in, if wait be used as the heat exchanger in the refrigerant the heat exchanger upstream the boil-off gas and
The temperature difference between the boil-off gas cooled down by the compressor compresses and by the heat exchanger be (hereinafter referred to as " cold flow
The temperature difference ") and the boil-off gas as the refrigerant in the heat exchanger and concurrent by the compressor compresses
The lower value being sent between the temperature difference between the boil-off gas of the heat exchanger (hereinafter referred to as " temperature difference of hot-fluid ") is
First preset value is greater than the first preset value and predetermined hold-time period or longer time, or if by the compressor compresses
And the boil-off gas of the heat exchanger is sent at the position of the heat exchanger upstream and in the heat exchanger
Pressure difference (hereinafter referred to as " the zone of heat liberation between the boil-off gas cooled down at the position in downstream by the heat exchanger
Pressure difference ") be the second preset value or be greater than the second preset value and predetermined hold-time period or longer time, it is determined that arrive
Discharge the time of the lubricating oil for being condensed or being solidified.
9. the method for the slave re-liquefied system discharge lubricating oil of boil-off gas, special according to any one of claim 3 to 5
Sign is, the boil-off gas it is re-liquefied after, the liquefied gas separated by the gas/liquid separation is along the described 5th
Supply line is sent to reserve tank, and
Flow rate for adjusting fluid is placed in the 5th supply with the 8th valve opened/closed for corresponding to supply line
On pipeline,
8th valve is closed during step 2) to step 6).
10. the method for discharging lubricating oil to the re-liquefied system of slave boil-off gas described in any one of 8 according to claim 1,
It is characterized in that, after determining that the heat exchanger restores normal, simultaneously closes off institute in opening first valve and second valve
It states bypass valve and executes the re-liquefied of the boil-off gas later.
11. a kind of method from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that the boil-off gas is re-liquefied
System be configured to pass the boil-off gas as described in compressor compresses, by heat exchanger via with the unpressed boil-off gas
The cooling compressed boil-off gas of heat exchange, and by pressure reducer reduce via the pressure of the cooling fluid of heat exchange Lai
The re-liquefied boil-off gas,
Wherein the compressor includes at least one glossy slip cylinder,
The boil-off gas is sent to the compressor and by the compressor via around the by-pass line of the heat exchanger
Compression,
Engine is supplied to by the boil-off gas of the compressor compresses, and
The superfluous boil-off gas for being not supplied to the engine is supplied to the heat exchanger melt the lubricating oil
Or its viscosity reduces use later and is condensed or coagulated by the increased boil-off gas discharge of temperature during the compressor compresses
Solid the lubricating oil.
12. the method according to claim 11 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that
The boil-off gas it is re-liquefied after, divided each other by the liquefied gas and gaseous state boil-off gas of re-liquefied generation by gas/liquid separation
From, and the gaseous state boil-off gas separated by the gas/liquid separation along the 6th supply line from the gas/liquid separation
Discharge, and
Wherein melting or viscosity reduce and by by the increased boil-off gas discharges of temperature during the compressor compresses
The lubricating oil is collected in the gas/liquid separation.
13. the method according to claim 11 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that
By at least one of oil eliminator and the first oil filter after the boil-off gas filtering lubricating oil, institute is passed through
It states and the heat exchanger is sent to by the boil-off gas of the compressor compresses after by-pass line.
14. the method according to claim 13 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that institute
State the lubricating oil that the separation of the first oil filter has vapour phase or mist phase.
15. the method according to claim 12 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that the
It is upper that two oil filters are placed at least one of following position: position between the pressure reducer and the gas/liquid separation, by
The liquefied gas of gas/liquid separation separation be discharged via the 5th supply line and the 6th supply line,
Second oil filter is low temperature oil filter.
16. the method according to claim 15 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that institute
State the lubricating oil that the separation of the second oil filter has solid phase.
17. the method according to claim 12 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that
Through by by the compressor compresses and being sent to the boil-off gas of the gas/liquid separation after the heat exchanger
Duplicate follow is subjected to and being sent to the by-pass line along the 6th supply line so as to by the compressor compresses
The ring period.
18. the method according to claim 17 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that weight
The multiple cycle period is until the temperature of the zone of heat liberation of the heat exchanger reaches by the compressor compresses and is sent to
The temperature of the boil-off gas of the heat exchanger.
19. a kind of method from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that the boil-off gas is re-liquefied
System is configured to use the boil-off gas as the re-liquefied boil-off gas of refrigerant,
Wherein heat exchanger uses the boil-off gas discharged from reserve tank as the refrigeration after the boil-off gas is re-liquefied
Agent is via the cooling boil-off gas by compressor compresses of heat exchange；
The compressor includes at least one glossy slip cylinder；And
It is condensed or the lubricating oil that solidifies is by being disposed to the by-pass line discharge around the heat exchanger and melting or glutinous
Degree uses during overhauling the heat exchanger after reducing.
20. a kind of method from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that the boil-off gas is re-liquefied
System is configured to pass the boil-off gas as described in compressor compresses, by heat exchanger via the heat with unpressed boil-off gas
The cooling compressed boil-off gas of exchange, and the pressure via the cooling fluid of heat exchange is reduced come liquid again by pressure reducer
Change the boil-off gas,
Wherein the compressor includes at least one glossy slip cylinder, and if meeting at least one of the following conditions really
Surely time of lubricating oil that discharge is condensed or solidified has been arrived:
To the boil-off gas of the heat exchanger upstream as the refrigerant in the heat exchanger and by the compression
The temperature difference (hereinafter referred to as " temperature difference of cold flow ") between machine compression and the boil-off gas cooled down by the heat exchanger is the
One preset value or greater than the first preset value and the condition in predetermined hold-time period or longer time；
The boil-off gas as the refrigerant in the heat exchanger and by the compressor compresses and it is sent to institute
It is first preset value or big for stating the temperature difference (hereinafter referred to as " temperature difference of hot-fluid ") between the boil-off gas of heat exchanger
In first preset value and the condition in predetermined hold-time period or longer time；And
The evaporation of the heat exchanger is sent to by the compressor compresses and in the position of the heat exchanger upstream
Pressure difference between gas and the boil-off gas cooled down at the position in the heat exchanger downstream by the heat exchanger
(hereinafter referred to as " pressure difference of zone of heat liberation ") is the second preset value or is greater than the second preset value and predetermined hold-time period
Or the condition of longer time.
21. a kind of method from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that the boil-off gas is re-liquefied
System is configured to pass the boil-off gas as described in compressor compresses, by heat exchanger via the heat with unpressed boil-off gas
The cooling compressed boil-off gas of exchange, and the pressure via the cooling fluid of heat exchange is reduced come liquid again by pressure reducer
Change the boil-off gas,
Wherein the compressor includes at least one glossy slip cylinder, and if to as the refrigerant in the heat exchanger
The heat exchanger upstream the boil-off gas and described in being cooled down as the compressor compresses and as the heat exchanger
The temperature difference (hereinafter referred to as " temperature difference of cold flow ") between boil-off gas and as the refrigerant in the heat exchanger
The boil-off gas and by the compressor compresses and be sent between the boil-off gas of the heat exchanger the temperature difference (under
Text be known as " temperature difference of hot-fluid ") between lower value be the first preset value or be greater than the first preset value and predetermined hold-time period
Or the longer time, or if the heat exchange is sent to by the compressor compresses and in the position of the heat exchanger upstream
The boil-off gas of device and the boil-off gas cooled down at the position in the heat exchanger downstream by the heat exchanger
Between pressure difference (hereinafter referred to as " pressure difference of zone of heat liberation ") be the second preset value or be greater than the second preset value and continue
Predetermined period of time or longer time, it is determined that the time for the lubricating oil for being condensed or being solidified to discharge.
22. a kind of method from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that the boil-off gas is re-liquefied
System is configured to use the boil-off gas as the re-liquefied boil-off gas of refrigerant,
Wherein at least one of temperature difference and pressure difference based on equipment are determined is condensed or the lubricating oil that solidifies for discharging
Time point, and it is described for discharging the time point of the lubricating oil for being condensed or being solidified by notification unit instruction.
23. the method according to claim 22 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that institute
Stating equipment includes the heat exchanger for including micro-channel type fluid channel.
24. a kind of method from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that the boil-off gas is re-liquefied
System is configured to use the boil-off gas as the re-liquefied boil-off gas of refrigerant,
The lubricating oil wherein collected in gas/liquid separation is via the Grease relief pipeline separated with the 5th supply line from described
Gas/liquid separation discharge, by the boil-off gas re-liquefied generation liquefied gas via the 5th supply line from described
Gas/liquid separation discharge.
25. the method according to claim 24 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that logical
It crosses and nitrogen supply (NS) is increased to the speed that the lubricating oil is discharged from the gas/liquid separation into the gas/liquid separation.
26. the method according to claim 25 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that
The boil-off gas it is re-liquefied after, compressed boil-off gas uses the boil-off gas as refrigerant in a heat exchanger
And it cools down, and after discharging the lubricating oil, nitrogen is supplied to the gas/liquid separation along zone of heat liberation, described through pressing
The boil-off gas of contracting is supplied to the heat exchanger via the zone of heat liberation.
27. the method for the slave re-liquefied system discharge lubricating oil of boil-off gas, feature according to claim 25 or 26 exist
In the nitrogen for being supplied to the gas/liquid separation has 5 bars to 7 bars of pressure.
28. the method for the slave re-liquefied system discharge lubricating oil of boil-off gas according to any one of claim 24 to 26,
It is characterized in that, the boil-off gas it is re-liquefied after, the liquefied gas separated by the gas/liquid separation is along described
5th supply line is sent to reserve tank, and the 8th valve is placed in the flow rate that fluid is adjusted on the 5th supply line
With opening/closing for the 5th supply line, the 8th valve is closed during the discharge of the lubricating oil.
29. the method for the slave re-liquefied system discharge lubricating oil of boil-off gas according to any one of claim 24 to 26,
It is characterized in that, driving engine during the discharge of the lubricating oil.
30. the method for the slave re-liquefied system discharge lubricating oil of boil-off gas according to any one of claim 24 to 26,
It is characterized in that, the boil-off gas to be supplied to the cold fluid pass of heat exchanger is compressed after the discharge of the lubricating oil
And the zone of heat liberation of the heat exchanger is sent to after around the heat exchanger.
31. a kind of fuel cut engine method, which is characterized in that pass through during the discharge for the lubricating oil for being condensed or being solidified
Make the lubricating oil melting for being condensed or being solidified or reduces its viscosity and supply fuel to engine.
32. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that the time point for discharging the lubricating oil for being condensed or being solidified is indicated by notification unit.
33. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that if the performance of the heat exchanger is reduced to 60% to the 80% of its normal performance, it is determined that arrived row
Put the time of the lubricating oil for being condensed or being solidified.
34. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that first preset value is 35 DEG C.
35. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that second preset value is twice of the preset value of normal operating.
36. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that second preset value is 2 bars (200kPa).
37. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that the predetermined period of time is 1 hour.
38. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that the temperature difference of the cold flow is warm by be placed in the cold fluid pass upstream of the heat exchanger first
The 4th temperature sensor detection of degree sensor and the zone of heat liberation downstream for being placed in the heat exchanger.
39. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that the temperature difference of the hot-fluid is warm by be placed in the cold fluid pass downstream of the heat exchanger second
The third temperature sensor detection of degree sensor and the zone of heat liberation upstream for being placed in the heat exchanger.
40. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that the pressure difference of the zone of heat liberation is by being placed in the zone of heat liberation of the heat exchanger
The second pressure sensor of the first pressure sensor of upstream and the zone of heat liberation downstream for being placed in the heat exchanger
Detection.
41. the side of the re-liquefied system discharge lubricating oil of the slave boil-off gas according to any one of claim 7,8,20 and 21
Method, which is characterized in that the pressure difference of the zone of heat liberation measures the institute of the heat exchanger by pressure difference transducer
The pressure difference between the upstream of zone of heat liberation and the downstream of the zone of heat liberation of the heat exchanger is stated to detect.
42. according to claim 1 to the re-liquefied system discharge lubricating oil of slave boil-off gas described in any one of 8 and 11 to 21
Method, which is characterized in that the boil-off gas is compressed to 150 bars to 350 bars of pressure by the compressor.
43. according to claim 1 to the re-liquefied system discharge lubricating oil of slave boil-off gas described in any one of 8 and 11 to 21
Method, which is characterized in that the boil-off gas is compressed to 80 bars to 250 bars of pressure by the compressor.
44. according to claim 1 to the re-liquefied system discharge lubricating oil of slave boil-off gas described in any one of 8 and 11 to 21
Method, which is characterized in that the heat exchanger includes micro-channel type fluid channel.
45. the method according to claim 44 from the re-liquefied system discharge lubricating oil of boil-off gas, which is characterized in that institute
Stating heat exchanger is printed circuit heat exchanger.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2017-0097314 | 2017-07-31 | ||
| KR1020170097314A KR101908569B1 (en) | 2017-07-31 | 2017-07-31 | Method of Discharging Lubrication Oil in Boil-Off Gas Reliquefaction System and Method of Supplying Fuel for Engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109323127A true CN109323127A (en) | 2019-02-12 |
| CN109323127B CN109323127B (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810440546.7A Active CN109323127B (en) | 2017-07-31 | 2018-05-09 | Method for discharging lubricating oil and engine fuel supply method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6371930B1 (en) |
| KR (1) | KR101908569B1 (en) |
| CN (1) | CN109323127B (en) |
Cited By (2)
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| CN111637358A (en) * | 2019-07-22 | 2020-09-08 | 株式会社神户制钢所 | Control method of compressor unit, compressor unit and plurality of compression sections |
| CN115111525A (en) * | 2021-06-08 | 2022-09-27 | 志同能源系统私人有限公司 | System and method for treating boil-off gas |
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| KR102003409B1 (en) * | 2018-11-01 | 2019-07-24 | 대우조선해양 주식회사 | Method and System for Re-liquefying Boil-Off Gas of Vessels |
| KR102211432B1 (en) * | 2018-12-27 | 2021-02-04 | 대우조선해양 주식회사 | Cryogenic Oil Filter and Boil-Off Gas Treatment System having the same for Vessels |
| KR102142940B1 (en) * | 2019-04-09 | 2020-08-11 | 가부시키가이샤 고베 세이코쇼 | Compressor unit and stopping method of compressor unit |
| KR102724282B1 (en) * | 2022-03-18 | 2024-10-31 | 이상훈 | process for determining reliability using apparatus for determining reliability of hydrogen-absorbing solid |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109323127B (en) | 2021-06-01 |
| JP6371930B1 (en) | 2018-08-08 |
| JP2019027589A (en) | 2019-02-21 |
| KR101908569B1 (en) | 2018-10-16 |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 3370 Juti Road, Juji City, Gyeongsangnam do, South Korea Patentee after: Hanhua Ocean Co.,Ltd. Address before: 3370 Judi Road, Juji City, gyeongnan Road, Republic of Korea postal code: 53302 Patentee before: DAEWOO SHIPBUILDING & MARINE ENGINEERING Co.,Ltd. |