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WO2021167245A1 - Lng boil-off gas reliquefaction system for small- and medium-sized lng-fueled ships, and lng boil-off gas reliquefaction method using same - Google Patents

Lng boil-off gas reliquefaction system for small- and medium-sized lng-fueled ships, and lng boil-off gas reliquefaction method using same Download PDF

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Publication number
WO2021167245A1
WO2021167245A1 PCT/KR2021/000244 KR2021000244W WO2021167245A1 WO 2021167245 A1 WO2021167245 A1 WO 2021167245A1 KR 2021000244 W KR2021000244 W KR 2021000244W WO 2021167245 A1 WO2021167245 A1 WO 2021167245A1
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WIPO (PCT)
Prior art keywords
boil
gas
lng
lng fuel
bog
Prior art date
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PCT/KR2021/000244
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French (fr)
Korean (ko)
Inventor
정제헌
최금식
Original Assignee
선보공업주식회사
선보유니텍주식회사
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Publication of WO2021167245A1 publication Critical patent/WO2021167245A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B17/0027—Tanks for fuel or the like ; Accessories therefor, e.g. tank filler caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/06—Apparatus for de-liquefying, e.g. by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • 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
    • 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
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0185—Arrangement comprising several pumps or compressors
    • 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
    • F17C2265/031—Treating the boil-off by discharge
    • 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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • 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
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

Definitions

  • the present invention relates to an LNG boil-off gas reliquefaction system for small and medium-sized LNG fuel propulsion ships and a method for reliquefying LNG boil-off gas using the same.
  • a boil-off gas reliquefaction system By reliquefying multiple times through a heat exchanger, it effectively recycles waste BOG even in small and medium-sized vessels that are not equipped with a separate reliquefaction system, as well as reducing operating and bunkering costs of small and medium-sized vessels.
  • It relates to a boil-off gas reliquefaction system and a method for reliquefying LNG boil-off gas using the same.
  • LNG is emerging as a clean fuel that can reduce harmful substances such as SOx, NOx and carbon dioxide and greenhouse gases compared to conventional fossil fuels, and its application is very wide not only on land but also in the ocean, that is, in shipbuilding and ship fields. is the trend
  • LNG exists as a cryogenic liquid at -162°C under atmospheric pressure, and is supplied to individual consumers after being stored in a cryogenic tank.
  • the pressure of the main pipeline supply chain for natural gas that is connected to the main demand varies from country to country, but is usually operated in the range of 70-120 bar.
  • the LNG stored inside the storage tank is suppressed from heat inflow through the use of insulating materials, but due to the temperature difference between the atmospheric temperature and the inside of the tank, it inevitably causes heat inflow. It is known that 0.15% vol% of stored LNG is evaporated on a daily basis.
  • the evaporated BOG is compressed by the BOG compressor, and the LNG stored in the tank is pressurized to the pressure of the main pipeline supply network through a low-pressure pump and a high-pressure pump, and then is vaporized and sent out.
  • BOG reliquefaction device is a device that cools/liquefies BOG with sub-cooled sensible heat of LNG by directly contacting the first boosted LNG and pressurized BOG with a low pressure pump. Finally, BOG liquefied LNG is transferred to a high-pressure pump.
  • Such BOG reliquefaction apparatus is equipped with large LNG carriers, but in the case of small and medium-sized LNG fuel-powered ships, there is a problem in that proper facilities are not made due to the limitation of the scale.
  • the present invention is intended to solve the above problems, and it is a small and medium-sized LNG fuel that not only effectively recycles BOG thrown away even in small and medium-sized vessels that are not equipped with a separate reliquefaction system, but also reduces the operation and bunkering costs of small and medium-sized vessels.
  • An object of the present invention is to provide an LNG BOG reliquefaction system for a propulsion ship and a method for reliquefying LNG BOG using the same.
  • the LNG boil-off gas reliquefaction system for a small and medium-sized LNG fuel propulsion ship is connected to an LNG fuel tank, and a boil-off gas compressor for compressing boil-off gas (BOG) in the LNG fuel tank, provided inside the LNG fuel tank
  • An in-tank pump that pressurizes the LNG fuel and supplies it to the engine, connected to the in-tank pump, and pressurizing the LNG fuel supplied through the in-tank pump to the required pressure required by the engine
  • a first heat exchanger for cooling the boil-off gas is provided between the pressurization pump and the boil-off gas compressor, and the evaporation gas is exchanged between the LNG fuel supplied through the pressurization pump and the boil-off gas supplied through the boil-off gas compressor.
  • a second heat exchanger for cooling the gas wherein the boil-off gas compressed through the boil-off gas compressor is first cooled through the second heat exchanger, and then secondary cooling is performed through the first heat exchanger can
  • the present invention provides a method for further cooling the BOG compressed by the BOG compressor by exchanging heat between the BOG supplied to the BOG compressor and the BOG compressed by the BOG compressor. 3 It may be characterized by further comprising a heat exchanger.
  • the present invention may further include a boil-off gas additional compressor for recompressing the boil-off gas compressed through the boil-off gas compressor.
  • the present invention may further include a booster pump provided between the in-tank pump and the first heat exchanger and further pressurizing the LNG fuel pressurized through the in-tank pump.
  • a vaporizer for vaporizing the LNG fuel that has undergone heat exchange through the second heat exchanger may be provided between the second heat exchanger and the engine.
  • the present invention is provided between the first heat exchanger and the LNG fuel tank, the boil-off gas cooled by the first heat exchanger is expanded to convert it into a liquefied LNG fuel, and then to the LNG fuel tank. It may be characterized in that it further comprises a flow control valve for supplying.
  • the present invention is provided between the flow control valve and the LNG fuel tank, and after separating the BOG remaining in the LNG fuel in a liquefied state supplied through the flow control valve, the separated BOG is It may further include a gas-liquid separator for re-supplying to the boil-off gas compressor.
  • the LNG boil-off gas reliquefaction method using the LNG boil-off gas reliquefaction system for a small and medium-sized LNG fuel propulsion ship uses a boil-off gas compressor connected to the LNG fuel tank to reduce boil-off gas (BOG) in the LNG fuel tank.
  • BOG boil-off gas
  • supplying in the engine direction by using a second heat exchanger provided between the BOG compressor and the pressurization pump to exchange heat between the LNG fuel supplied through the pressurization pump and the BOG supplied through the BOG compressor.
  • Secondary cooling of the boil-off gas by exchanging heat with each other may include supplying the boil-off gas to the LNG fuel tank.
  • FIG. 1 is a diagram showing the configuration of an LNG boil-off gas reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship according to an embodiment of the present invention.
  • FIG. 2 is a view showing a method for reliquefying LNG boil-off gas in a series sequence using the LNG boil-off gas reliquefaction system for a small and medium-sized LNG fueled propulsion ship shown in FIG.
  • FIG. 1 is a diagram showing the configuration of an LNG boil-off gas reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship according to an embodiment of the present invention.
  • the LNG BOG reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship is largely a BOG compressor 110 , an in-tanp pump 120 , a pressurization pump 130 , and a second It may be configured to include a first heat exchanger 140 and a second heat exchanger 150 .
  • the third heat exchanger 160, the boil-off gas additional compressor 170, the booster pump 180, the vaporizer 190, the flow control valve 200 and the gas-liquid separator 210 further comprising may be configured.
  • the boil-off gas compressor 110 is connected to the LNG fuel tank 10 , and serves to increase the temperature by pressurizing and compressing the boil-off gas (BOG) of low pressure generated in the LNG fuel tank 10 .
  • BOG boil-off gas
  • the boil-off gas compressor 110 increases the temperature of the boil-off gas to a temperature of 100 to 150 degrees Celsius by compressing the low-pressure boil-off gas to a pressure corresponding to, for example, 30 barg to 100 barg, preferably 50 barg. .
  • This boil-off gas is then liquefied while being cooled to a temperature of -130 degrees to -155 degrees below zero by heat-exchanging through the first and second heat exchangers 140 and 150 .
  • the in-tank pump 120 serves to pressurize the LNG fuel while being provided inside the LNG fuel tank 10 and supply it to the pressurization pump 130 to be described later. At this time, the pressure value for pressurizing the LNG fuel in the in-tank pump 120 corresponds to the pressure value required by the pressurization pump 130 .
  • the pressurization pump 130 is connected to the in-tank pump 120, and by additionally pressurizing the pressurized LNG fuel supplied through the in-tank pump 120, forms the pressure required by the engine and supplies it to the engine. do.
  • the first heat exchanger 140 is located between the in-tank pump 120 and the pressurization pump 130 , and uses the cooling heat of the pressurized LNG fuel supplied through the in-tank pump 120 to the boil-off gas compressor 110 . ) serves to cool the boil-off gas by exchanging heat with each other.
  • the BOG supplied through the BOG compressor 110 corresponds to BOG that has been primarily cooled through the second heat exchanger 150 to be described later. That is, the first heat exchanger 140 secondaryly cools the BOG that has been primarily cooled through the second heat exchanger 150 to be described later so that the BOG becomes a liquefied LNG fuel.
  • the second heat exchanger 150 is located between the pressurization pump 130 and the boil-off gas compressor 110 , and uses the cooling heat of the pressurized LNG fuel supplied through the pressure pump 130 to the boil-off gas compressor 110 . It serves to primarily cool the boil-off gas by exchanging heat with each other. That is, after the second heat exchanger 150 preferentially cools the BOG, the first heat exchanger 140 further cools the BOG.
  • a third heat exchanger ( 160) is further included.
  • the third heat exchanger 160 is provided to span a line connecting the LNG fuel tank 110 and the BOG compressor 110 and a line connecting the BOG compressor 110 and the second heat exchanger 150 , respectively. do.
  • the BOG supplied to the second heat exchanger 150 through the BOG compressor 110 is cooled by the cooling heat of the BOG passing through the third heat exchanger 160 in the LNG fuel tank 10 .
  • the present invention may include a boil-off gas additional compressor 170 for further compressing the boil-off gas compressed through the boil-off gas compressor 110 .
  • BOG additional compressor 170 is a consumer of compressed BOG and serves to recompress the remaining BOG remaining unused in a DF engine (DFGE) using natural gas as fuel and supply it back to the BOG compressor 110 .
  • DFGE DF engine
  • the reliquefaction efficiency and the reliquefaction amount may be increased by further increasing the pressure of the reliquefied BOG.
  • the BOG additional compressor 170 adjusts the pressure value of the BOG compressed through the BOG compressor 110 to 150 bar. It serves to further compress to 170 bar.
  • a booster pump 180 for further pressurizing the LNG fuel pressurized through the in-tank pump 120 between the in-tank pump 120 and the first heat exchanger 140 may be included.
  • the booster pump 180 further pressurizes the LNG fuel pressurized through the in-tank pump 120 to supply the LNG fuel with a high pressure (eg, 300 barg) to the first heat exchanger 140 .
  • the present invention includes a vaporizer 190 for vaporizing the LNG fuel that has undergone heat exchange between the second heat exchanger 150 and the engine of the ship through the second heat exchanger 150 .
  • the vaporizer 190 serves to create the temperature required by the engine by vaporizing the LNG fuel pressurized by the pressure pump 130 and heat exchanged.
  • hot water or steam may be applied as a thermal medium.
  • the present invention converts the LNG fuel in a liquefied state by expanding the boil-off gas cooled by the first heat exchanger 140 between the first heat exchanger 140 and the LNG fuel tank 100 and then the LNG It is configured to include a flow control valve 200 to be supplied to the fuel tank (10).
  • the flow control valve 200 corresponds to a Joule-Thomson valve, and by rapidly expanding the boil-off gas cooled by the first heat exchanger 140 , the LNG fuel in the liquefied state is reduced through the pressure drop of the compressed gas. As possible, it is supplied to the LNG fuel tank 10 . It may be reliquefied at a temperature of approximately minus 160 degrees Celsius by the flow control valve 200 .
  • the present invention separates the boil-off gas remaining in the LNG fuel in the liquefied state supplied through the flow control valve 200 between the flow control valve 200 and the LNG fuel tank 10 and then separates It may be configured to include a gas-liquid separator 210 for re-supplying the boil-off gas to the boil-off gas compressor 110 .
  • the gas-liquid separator 210 separates the line for supplying the reliquefied LNG fuel into the LNG fuel tank 10 by the flow control valve 200 and the BOG remaining in the reliquefied LNG fuel, and then the separated evaporation It is divided into a line for supplying gas to the boil-off gas supply line connecting the LNG fuel tank 10 and the boil-off gas compressor 110 again.
  • the boil-off gas separated by the gas-liquid separator 210 is again supplied to the boil-off gas compressor 110 after being merged with the LNG fuel supplied from the LNG fuel tank 10 .
  • the BOG discharged from the LNG fuel tank 10 is compressed using the BOG compressor 110 connected to the LNG fuel tank 10 (S201).
  • the LNG fuel supplied through the pressure pump 130 and the BOG compressor 110 are supplied.
  • the BOG is primarily cooled (S203).
  • the LNG fuel supplied through the in-tank pump 120 and the second heat exchanger 150 are mixed.
  • BOG is secondarily cooled and supplied to the LNG fuel tank 10 (S204).
  • the present invention BOG thrown away can be effectively recycled even in small and medium-sized ships that are not equipped with a separate reliquefaction system.
  • the present invention is a technology that can be widely used in the LNG industry to realize its practical and economical value.

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Abstract

The present invention relates to an LNG boil-off gas (BOG) reliquefaction system for small- and medium-sized LNG-fueled ships, and an LNG BOG reliquefaction method using same, the system reliquefying BOG, which is generated from LNG fuel appearing as a clean fuel, multiple times through a plurality of heat exchangers, thereby allowing BOG, which is to be disposed of, to be effectively recycled even on small- and medium-sized ships not equipped with an additional reliquefaction system, and reducing operating costs and bunker costs of small- and medium-sized ships.

Description

중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템 및 이를 이용한 LNG 증발가스 재액화 방법LNG boil-off gas reliquefaction system for small and medium-sized LNG fueled propulsion ships and LNG boil-off gas reliquefaction method using the same
본 발명은 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템 및 이를 이용한 LNG 증발가스 재액화 방법에 관한 것으로서, 보다 구체적으로는, 청정연료로 부상하는 LNG 연료에서 발생되는 증발가스(BOG)를 다수의 열교환기를 통해 다수 회 재액화시킴으로써, 별도의 재액화 시스템이 갖추어지지 못한 중소형 선박에서도 버려지는 BOG를 효과적으로 재활용되도록 함은 물론, 중소형 선박의 운항비용 및 벙커링 비용이 절감되도록 하는 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템 및 이를 이용한 LNG 증발가스 재액화 방법에 관한 것이다.The present invention relates to an LNG boil-off gas reliquefaction system for small and medium-sized LNG fuel propulsion ships and a method for reliquefying LNG boil-off gas using the same. By reliquefying multiple times through a heat exchanger, it effectively recycles waste BOG even in small and medium-sized vessels that are not equipped with a separate reliquefaction system, as well as reducing operating and bunkering costs of small and medium-sized vessels. It relates to a boil-off gas reliquefaction system and a method for reliquefying LNG boil-off gas using the same.
일반적으로, LNG는 기존의 화석연료 대비 SOx, NOx 및 이산화탄소 등의 유해물질 및 온실가스를 저감시킬 수 있는 청정연료로 부상하고 있으며 육상뿐만 아니라 해양, 즉 조선 및 선박 분야에서도 활용처가 매우 넓어지고 있는 추세이다.In general, LNG is emerging as a clean fuel that can reduce harmful substances such as SOx, NOx and carbon dioxide and greenhouse gases compared to conventional fossil fuels, and its application is very wide not only on land but also in the ocean, that is, in shipbuilding and ship fields. is the trend
LNG는 대기압 조건에서 -162°C의 초저온 액체상태로 존재하며, 초저온 탱크 내부에 저장된 후에 개별 수요처에 공급된다. 참고로 주요 수요처로 연결되는 천연가스의 주배관 공급망의 압력은 개별 나라마다 다르나 통상 70~120 bar 범위에서 운영되고 있다.LNG exists as a cryogenic liquid at -162°C under atmospheric pressure, and is supplied to individual consumers after being stored in a cryogenic tank. For reference, the pressure of the main pipeline supply chain for natural gas that is connected to the main demand varies from country to country, but is usually operated in the range of 70-120 bar.
저장탱크 내부에 저장된 LNG는 단열재 사용을 통해 열유입이 억제되어 있으나 대기온과 탱크 내부의 온도차이로 인해 불가피하게 열유입이 될 수밖에 없으며, 최근 단열기술의 발달로 선박에 사용되는 멤브레인 탱크의 경우 일일 기준 저장된 LNG의 0.15% vol%가 증발되어는 것으로 알려져 있다. 증발된 증발가스는 BOG 압축기에 의해 압축되며, 탱크에 저장된 LNG는 저압펌프 및 고압펌프를 통해 주배관 공급망의 압력으로 승압된 후, 기화되어 송출된다.The LNG stored inside the storage tank is suppressed from heat inflow through the use of insulating materials, but due to the temperature difference between the atmospheric temperature and the inside of the tank, it inevitably causes heat inflow. It is known that 0.15% vol% of stored LNG is evaporated on a daily basis. The evaporated BOG is compressed by the BOG compressor, and the LNG stored in the tank is pressurized to the pressure of the main pipeline supply network through a low-pressure pump and a high-pressure pump, and then is vaporized and sent out.
증발가스 재액화장치는 저압펌프로 1차 승압된 LNG와 가압된 BOG를 서로 직접 접촉시킴으로써 LNG의 과냉(Sub-cooled)된 현열(Sensible heat)로 BOG를 냉각/액화하는 장치이다. 최종적으로 BOG가 액화된 LNG는 고압펌프로 이송된다.BOG reliquefaction device is a device that cools/liquefies BOG with sub-cooled sensible heat of LNG by directly contacting the first boosted LNG and pressurized BOG with a low pressure pump. Finally, BOG liquefied LNG is transferred to a high-pressure pump.
이러한 증발가스 재액화장치는 대형 LNG 운반선에는 설비가 이루어져있지만, 중소형 LNG 연료 추진선박의 경우에는 그 규모적 한계로 인해 제대로 된 설비가 이루어지지 못하는 문제점이 있다.Such BOG reliquefaction apparatus is equipped with large LNG carriers, but in the case of small and medium-sized LNG fuel-powered ships, there is a problem in that proper facilities are not made due to the limitation of the scale.
따라서, 중소형 LNG 연료 추진 선박에서도 버려지는 BOG를 효과적으로 냉각하여 다시 연료로 재사용하기 위한 재액화 설비가 필요한 실정이다.Therefore, there is a need for a re-liquefaction facility for effectively cooling the BOG discarded even in small and medium-sized LNG fuel-propelled ships and reusing it as fuel.
본 발명은 전술한 문제점을 해결하기 위한 것으로, 별도의 재액화 시스템이 갖추어지지 못한 중소형 선박에서도 버려지는 BOG를 효과적으로 재활용되도록 함은 물론, 중소형 선박의 운항비용 및 벙커링 비용이 절감되도록 하는 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템 및 이를 이용한 LNG 증발가스 재액화 방법을 제공하고자 한다.The present invention is intended to solve the above problems, and it is a small and medium-sized LNG fuel that not only effectively recycles BOG thrown away even in small and medium-sized vessels that are not equipped with a separate reliquefaction system, but also reduces the operation and bunkering costs of small and medium-sized vessels. An object of the present invention is to provide an LNG BOG reliquefaction system for a propulsion ship and a method for reliquefying LNG BOG using the same.
본 발명의 일 실시예에 따른 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템은 LNG 연료 탱크와 연결되며, 상기 LNG 연료 탱크 내 증발가스(BOG)를 압축하는 증발가스 압축기, LNG 연료 탱크 내측에 마련되며, LNG 연료를 가압하여 엔진 방향으로 공급하는 인 탱크 펌프(In-tank pump), 상기 인 탱크 펌프와 연결되며, 상기 인 탱크 펌프를 통해 공급되는 LNG 연료를 가압하여 상기 엔진에서 요구하는 요구 압력을 형성하여 상기 엔진 방향으로 공급하는 가압 펌프, 상기 인 탱크 펌프와 상기 가압 펌프 사이에 마련되며, 상기 인 탱크 펌프를 통해 공급되는 LNG 연료와 상기 증발가스 압축기를 통해 공급되는 증발가스를 서로 열교환시킴으로써 상기 증발가스를 냉각시키는 제1 열교환기 및 상기 가압 펌프와 상기 증발가스 압축기 사이에 마련되며, 상기 가압 펌프를 통해 공급되는 LNG 연료와 상기 증발가스 압축기를 통해 공급되는 증발가스를 서로 열교환시킴으로써 상기 증발가스를 냉각시키는 제2 열교환기를 포함하며, 상기 증발가스 압축기를 통해 압축된 증발가스는 상기 제2 열교환기를 통해 1차 냉각이 이루어진 후, 상기 제1 열교환기를 통해 2차 냉각이 이루어지는 것을 특징으로 할 수 있다.The LNG boil-off gas reliquefaction system for a small and medium-sized LNG fuel propulsion ship according to an embodiment of the present invention is connected to an LNG fuel tank, and a boil-off gas compressor for compressing boil-off gas (BOG) in the LNG fuel tank, provided inside the LNG fuel tank An in-tank pump that pressurizes the LNG fuel and supplies it to the engine, connected to the in-tank pump, and pressurizing the LNG fuel supplied through the in-tank pump to the required pressure required by the engine A pressurization pump for supplying in the engine direction by forming a pressure pump, which is provided between the in-tank pump and the pressurization pump, by exchanging heat between the LNG fuel supplied through the in-tank pump and the boil-off gas supplied through the boil-off gas compressor. A first heat exchanger for cooling the boil-off gas is provided between the pressurization pump and the boil-off gas compressor, and the evaporation gas is exchanged between the LNG fuel supplied through the pressurization pump and the boil-off gas supplied through the boil-off gas compressor. a second heat exchanger for cooling the gas, wherein the boil-off gas compressed through the boil-off gas compressor is first cooled through the second heat exchanger, and then secondary cooling is performed through the first heat exchanger can
일 실시예에서, 본 발명은 상기 증발가스 압축기로 공급되는 증발가스와 상기 증발가스 압축기에 의해 압축이 완료된 증발가스를 서로 열교환시킴으로써, 상기 증발가스 압축기에 의해 압축이 완료된 증발가스를 추가 냉각시키는 제3 열교환기를 더 포함하는 것을 특징으로 할 수 있다.In one embodiment, the present invention provides a method for further cooling the BOG compressed by the BOG compressor by exchanging heat between the BOG supplied to the BOG compressor and the BOG compressed by the BOG compressor. 3 It may be characterized by further comprising a heat exchanger.
일 실시예에서, 본 발명은 상기 증발가스 압축기를 통해 압축된 증발가스를 재압축하는 증발가스 추가 압축기를 더 포함하는 것을 특징으로 할 수 있다.In one embodiment, the present invention may further include a boil-off gas additional compressor for recompressing the boil-off gas compressed through the boil-off gas compressor.
일 실시예에서, 본 발명은 상기 인 탱크 펌프와 상기 제1 열교환기 사이에 마련되며, 상기 인 탱크 펌프를 통해 가압된 LNG 연료를 추가 가압하는 부스터 펌프를 더 포함하는 것을 특징으로 할 수 있다.In one embodiment, the present invention may further include a booster pump provided between the in-tank pump and the first heat exchanger and further pressurizing the LNG fuel pressurized through the in-tank pump.
일 실시예에서, 상기 제2 열교환기와 상기 엔진 사이에는 상기 제2 열교환기를 통해 열교환이 이루어진 LNG 연료를 기화시키는 기화기가 마련되는 것을 특징으로 할 수 있다.In an embodiment, a vaporizer for vaporizing the LNG fuel that has undergone heat exchange through the second heat exchanger may be provided between the second heat exchanger and the engine.
일 실시예에서, 본 발명은 상기 제1 열교환기와 상기 LNG 연료 탱크 사이에 마련되며, 상기 제1 열교환기에 의해 냉각된 상기 증발가스를 팽창시켜 액화상태의 LNG 연료로 변환시킨 후 상기 LNG 연료 탱크로 공급하는 유량 제어 밸브를 더 포함하는 것을 특징으로 할 수 있다.In one embodiment, the present invention is provided between the first heat exchanger and the LNG fuel tank, the boil-off gas cooled by the first heat exchanger is expanded to convert it into a liquefied LNG fuel, and then to the LNG fuel tank. It may be characterized in that it further comprises a flow control valve for supplying.
일 실시예에서, 본 발명은 상기 유량 제어 밸브와 상기 LNG 연료 탱크 사이에 마련되며, 상기 유량 제어 밸브를 통해 공급되는 액화상태의 LNG 연료에 잔류하는 증발가스를 분리한 후, 분리된 증발가스는 상기 증발가스 압축기로 재공급하는 기액분리기를 더 포함하는 것을 특징으로 할 수 있다.In one embodiment, the present invention is provided between the flow control valve and the LNG fuel tank, and after separating the BOG remaining in the LNG fuel in a liquefied state supplied through the flow control valve, the separated BOG is It may further include a gas-liquid separator for re-supplying to the boil-off gas compressor.
본 발명의 다른 실시예에 따른 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템을 이용한 LNG 증발가스 재액화 방법은 LNG 연료 탱크와 연결된 증발가스 압축기를 이용하여 상기 LNG 연료 탱크 내 증발가스(BOG)를 압축하는 단계, 상기 LNG 연료 탱크 내측에 마련된 인 탱크 펌프(In-tank pump)를 이용하여 LNG 연료를 가압한 후, 상기 인 탱크 펌프와 연결된 가압 펌프를 이용하여 엔진에서 요구하는 요구 압력을 형성시켜 엔진 방향으로 공급하는 단계, 상기 증발가스 압축기와 상기 가압 펌프 사이에 마련되는 제2 열교환기를 이용하여, 상기 가압 펌프를 통해 공급되는 LNG 연료와 상기 증발가스 압축기를 통해 공급되는 증발가스를 서로 열교환시킴으로써 상기 증발가스를 1차 냉각시키는 단계 및 상기 가압 펌프와 상기 인 탱크 펌프 사이에 마련되는 제1 열교환기를 이용하여, 상기 인 탱크 펌프를 통해 공급되는 LNG 연료와 상기 제2 열교환기를 통해 1차 냉각된 증발가스를 서로 열교환시킴으로써 상기 증발가스를 2차 냉각시킨 후 상기 LNG 연료 탱크로 공급하는 단계를 포함하는 것을 특징으로 할 수 있다.The LNG boil-off gas reliquefaction method using the LNG boil-off gas reliquefaction system for a small and medium-sized LNG fuel propulsion ship according to another embodiment of the present invention uses a boil-off gas compressor connected to the LNG fuel tank to reduce boil-off gas (BOG) in the LNG fuel tank. Compressing, after pressurizing the LNG fuel using an in-tank pump provided inside the LNG fuel tank, a pressure required by the engine is formed using a pressurization pump connected to the in-tank pump. supplying in the engine direction, by using a second heat exchanger provided between the BOG compressor and the pressurization pump to exchange heat between the LNG fuel supplied through the pressurization pump and the BOG supplied through the BOG compressor. First cooling the boil-off gas and using a first heat exchanger provided between the pressure pump and the in-tank pump, the LNG fuel supplied through the in-tank pump and the second heat exchanger Secondary cooling of the boil-off gas by exchanging heat with each other may include supplying the boil-off gas to the LNG fuel tank.
본 발명의 일 측면에 따르면, 증발가스(BOG)를 다수의 열교환기를 통해 다수 회 재액화시킴으로써, 별도의 재액화 시스템이 갖추어지지 못한 중소형 선박에서도 버려지는 BOG를 효과적으로 재활용할 수 있도록 하는 이점을 가진다.According to one aspect of the present invention, by re-liquefying boil-off gas (BOG) multiple times through a plurality of heat exchangers, there is an advantage in that it is possible to effectively recycle discarded BOG even in small and medium-sized ships that are not equipped with a separate re-liquefaction system. .
또한 본 발명의 일 측면에 따르면, 자연적으로 발생되는 증발가스를 이용하는 중소형 LNG 연료 추진 선박에서도 운항조건에 구애받지 않고 효과적으로 증발가스를 재액화하여 연료로써 재활용할 수 있도록 하며, 이를 통해 선박의 운항비용 및 벙커링 비용이 절감되도록 하는 이점을 가진다.In addition, according to one aspect of the present invention, it is possible to re-liquefy BOG effectively and recycle it as a fuel, regardless of operating conditions, even in small and medium-sized LNG fuel-propelled ships that use naturally occurring BOG, and through this, the operating cost of the vessel and bunkering costs are reduced.
도 1은 본 발명의 일 실시예에 따른 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템(100)의 구성을 도시한 도면이다.1 is a diagram showing the configuration of an LNG boil-off gas reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship according to an embodiment of the present invention.
도 2는 도 1에 도시된 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템을 이용하여 LNG 증발가스를 재액화하기 위한 방법을 일련의 순서대로 도시한 도면이다.FIG. 2 is a view showing a method for reliquefying LNG boil-off gas in a series sequence using the LNG boil-off gas reliquefaction system for a small and medium-sized LNG fueled propulsion ship shown in FIG.
<부호의 설명><Explanation of code>
100: 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템100: LNG boil-off gas reliquefaction system for small and medium-sized LNG fueled ships
110: 증발가스 압축기110: boil-off gas compressor
120: 인 탱크 펌프120: in-tank pump
130: 가압 펌프130: pressurized pump
140: 제1 열교환기140: first heat exchanger
150: 제2 열교환기150: second heat exchanger
160: 제3 열교환기160: third heat exchanger
170: 증발가스 추가 압축기170: boil-off gas additional compressor
180: 부스터 펌프180: booster pump
190: 기화기190: carburetor
200: 유량 제어 밸브200: flow control valve
210: 기액분리기210: gas-liquid separator
이하, 본 발명의 이해를 돕기 위하여 바람직한 실시예를 제시한다. 그러나 하기의 실시예는 본 발명을 보다 쉽게 이해하기 위하여 제공되는 것일 뿐, 실시예에 의해 본 발명의 내용이 한정되는 것은 아니다.Hereinafter, preferred examples are presented to help the understanding of the present invention. However, the following examples are only provided for easier understanding of the present invention, and the content of the present invention is not limited by the examples.
도 1은 본 발명의 일 실시예에 따른 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템(100)의 구성을 도시한 도면이다.1 is a diagram showing the configuration of an LNG boil-off gas reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship according to an embodiment of the present invention.
도 1을 살펴보면, 본 발명의 일 실시예에 따른 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템(100)은 크게 증발가스 압축기(110), 인 탱프 펌프(120), 가압 펌프(130), 제1 열교환기(140) 및 제2 열교환기(150)를 포함하여 구성될 수 있다.Referring to FIG. 1 , the LNG BOG reliquefaction system 100 for a small and medium-sized LNG fuel propulsion ship according to an embodiment of the present invention is largely a BOG compressor 110 , an in-tanp pump 120 , a pressurization pump 130 , and a second It may be configured to include a first heat exchanger 140 and a second heat exchanger 150 .
또한 추가적으로 일 실시예에서는, 제3 열교환기(160), 증발가스 추가 압축기(170), 부스터 펌프(180), 기화기(190), 유량 제어 밸브(200) 및 기액분리기(210)를 더 포함하여 구성될 수 도 있다.In addition, in one embodiment, the third heat exchanger 160, the boil-off gas additional compressor 170, the booster pump 180, the vaporizer 190, the flow control valve 200 and the gas-liquid separator 210 further comprising may be configured.
먼저, 증발가스 압축기(110)는 LNG 연료 탱크(10)와 연결되며, LNG 연료 탱크(10) 내에서 발생되는 저압의 증발가스(BOG)를 가압, 압축시킴으로써 온도를 상승시키는 역할을 한다.First, the boil-off gas compressor 110 is connected to the LNG fuel tank 10 , and serves to increase the temperature by pressurizing and compressing the boil-off gas (BOG) of low pressure generated in the LNG fuel tank 10 .
보다 구체적으로, 증발가스 압축기(110)는 예컨대 30 barg 내지 100barg 범위, 바람직하게는 50barg에 해당하는 압력으로 저압의 증발가스를 압축시킴으로써 증발가스의 온도를 섭씨 100도 내지 150도의 온도로 상승시키게 된다. 이러한 증발가스는 추후 제1 및 제2 열교환기(140), 150)를 통해 열교환됨으로써 영하 -130도 내지 -155도의 온도로 냉각되면서 액화되게 된다.More specifically, the boil-off gas compressor 110 increases the temperature of the boil-off gas to a temperature of 100 to 150 degrees Celsius by compressing the low-pressure boil-off gas to a pressure corresponding to, for example, 30 barg to 100 barg, preferably 50 barg. . This boil-off gas is then liquefied while being cooled to a temperature of -130 degrees to -155 degrees below zero by heat-exchanging through the first and second heat exchangers 140 and 150 .
인 탱크 펌프(In-tank pump, 120)는 LNG 연료 탱크(10) 내측에 마련되면서 LNG 연료를 가압하여 후술되는 가압 펌프(130)로 공급하는 역할을 한다. 이때 인 탱크 펌프(120)에서 LNG 연료를 가압하는 압력값은 가압 펌프(130)에서 요구하는 압력값에 해당한다.The in-tank pump 120 serves to pressurize the LNG fuel while being provided inside the LNG fuel tank 10 and supply it to the pressurization pump 130 to be described later. At this time, the pressure value for pressurizing the LNG fuel in the in-tank pump 120 corresponds to the pressure value required by the pressurization pump 130 .
가압 펌프(130)는 인 탱크 펌프(120)와 연결되며, 인 탱크 펌프(120)를 통해 공급되는 가압된 LNG 연료를 추가로 가압함으로써 엔진이 요구하는 압력을 형성하여 엔진 방향으로 공급하는 역할을 한다.The pressurization pump 130 is connected to the in-tank pump 120, and by additionally pressurizing the pressurized LNG fuel supplied through the in-tank pump 120, forms the pressure required by the engine and supplies it to the engine. do.
제1 열교환기(140)는 인 탱크 펌프(120)와 가압 펌프(130) 사이에 위치하며, 인 탱크 펌프(120)를 통해 공급되는 가압된 LNG 연료가 가지는 냉열을 이용하여 증발가스 압축기(110)를 통해 공급되는 증발가스를 서로 열교환 시킴으로써 증발가스를 냉각시키는 역할을 한다.The first heat exchanger 140 is located between the in-tank pump 120 and the pressurization pump 130 , and uses the cooling heat of the pressurized LNG fuel supplied through the in-tank pump 120 to the boil-off gas compressor 110 . ) serves to cool the boil-off gas by exchanging heat with each other.
이때, 증발가스 압축기(110)를 통해 공급되는 증발가스는 후술되는 제2 열교환기(150)를 통해 1차적으로 냉각이 된 증발가스에 해당한다. 즉, 제1 열교환기(140)는 후술되는 제2 열교환기(150)를 통해 1차적으로 냉각이 된 증발가스를 2차적으로 추가 냉각시킴으로써 증발가스를 액화상태의 LNG 연료가 되도록 한다.In this case, the BOG supplied through the BOG compressor 110 corresponds to BOG that has been primarily cooled through the second heat exchanger 150 to be described later. That is, the first heat exchanger 140 secondaryly cools the BOG that has been primarily cooled through the second heat exchanger 150 to be described later so that the BOG becomes a liquefied LNG fuel.
제2 열교환기(150)는 가압 펌프(130)와 증발가스 압축기(110) 사이에 위치하며, 가압 펌프(130)를 통해 공급되는 가압된 LNG 연료가 가지는 냉열을 이용하여 증발가스 압축기(110)를 통해 공급되는 증발가스를 서로 열교환시킴으로써 증발가스를 1차적으로 냉각시키는 역할을 한다. 즉, 제2 열교환기(150)가 우선적으로 증발가스를 냉각시킨 후 제1 열교환기(140)가 이러한 증발가스를 더욱 냉각시키게 된다.The second heat exchanger 150 is located between the pressurization pump 130 and the boil-off gas compressor 110 , and uses the cooling heat of the pressurized LNG fuel supplied through the pressure pump 130 to the boil-off gas compressor 110 . It serves to primarily cool the boil-off gas by exchanging heat with each other. That is, after the second heat exchanger 150 preferentially cools the BOG, the first heat exchanger 140 further cools the BOG.
이러한 제1 및 제2 열교환기(140, 150)를 통한 증발가스의 냉각 과정에 대해서는 후술되는 도 2를 통해 보다 구체적으로 살펴보기로 한다.The cooling process of BOG through the first and second heat exchangers 140 and 150 will be described in more detail with reference to FIG. 2 to be described later.
본원발명에서는 LNG 연료 탱크(10)로부터 증발가스 압축기(110)를 향해 공급되는 증발가스의 냉열을 이용하여 증발가스 압축기(110)에 의해 압축이 완료된 증발가스를 추가적으로 냉각시키기 위한 제3 열교환기(160)를 더 포함한다.In the present invention, a third heat exchanger ( 160) is further included.
제3 열교환기(160)는 LNG 연료 탱크(110)와 증발가스 압축기(110)를 연결하는 라인과, 증발가스 압축기(110)와 제2 열교환기(150)를 연결하는 라인에 각각 걸치도록 마련된다.The third heat exchanger 160 is provided to span a line connecting the LNG fuel tank 110 and the BOG compressor 110 and a line connecting the BOG compressor 110 and the second heat exchanger 150 , respectively. do.
따라서, 증발가스 압축기(110)를 통해 제2 열교환기(150)로 공급되는 증발가스는 LNG 연료 탱크(10)에서 제3 열교환기(160)를 통하는 증발가스의 냉열에 의해 냉각된다.Accordingly, the BOG supplied to the second heat exchanger 150 through the BOG compressor 110 is cooled by the cooling heat of the BOG passing through the third heat exchanger 160 in the LNG fuel tank 10 .
또한, 일 실시예에서 본원발명에서는 증발가스 압축기(110)를 통해 압축된 증발가스를 보다 압축하는 증발가스 추가 압축기(170)를 포함할 수 있다.In addition, in one embodiment, the present invention may include a boil-off gas additional compressor 170 for further compressing the boil-off gas compressed through the boil-off gas compressor 110 .
증발가스 추가 압축기(170)는 압축된 증발가스의 수요처이면서 천연가스를 연료로 사용하는 DF엔진(DFGE)에서 사용되지 않고 남은 잉여 증발가스를 재압축하여 다시 증발가스 압축기(110)로 공급하는 역할을 한다. 이 경우, 재액화되는 증발가스의 압력을 보다 높임으로써 재액화 효율 및 재액화량을 높일 수 있다.BOG additional compressor 170 is a consumer of compressed BOG and serves to recompress the remaining BOG remaining unused in a DF engine (DFGE) using natural gas as fuel and supply it back to the BOG compressor 110 . do In this case, the reliquefaction efficiency and the reliquefaction amount may be increased by further increasing the pressure of the reliquefied BOG.
예컨대, 증발가스의 압력이 150bar 내지 170bar 부근인 경우에는 재액화량이 최대값을 나타내게 되는데, 증발가스 추가 압축기(170)는 이에 맞추어 증발가스 압축기(110)를 통해 압축된 증발가스의 압력값이 150bar 내지 170bar가 되도록 추가로 압축시키는 역할을 한다.For example, when the pressure of the BOG is in the vicinity of 150 bar to 170 bar, the reliquefaction amount shows the maximum value, and the BOG additional compressor 170 adjusts the pressure value of the BOG compressed through the BOG compressor 110 to 150 bar. It serves to further compress to 170 bar.
또한, 일 실시예에서 본원발명에서는 인 탱크 펌프(120)와 제1 열교환기(140) 사이에서 인 탱크 펌프(120)를 통해 가압된 LNG 연료를 추가로 가압하는 부스터 펌프(180)를 포함할 수 있다. 부스터 펌프(180)는 인 탱크 펌프(120)를 통해 가압된 LNG 연료를 보다 가압하여 고압력(예컨대, 300barg)의 LNG 연료가 제1 열교환기(140)에 공급되도록 한다.In addition, in one embodiment, in the present invention, a booster pump 180 for further pressurizing the LNG fuel pressurized through the in-tank pump 120 between the in-tank pump 120 and the first heat exchanger 140 may be included. can The booster pump 180 further pressurizes the LNG fuel pressurized through the in-tank pump 120 to supply the LNG fuel with a high pressure (eg, 300 barg) to the first heat exchanger 140 .
또한, 일 실시예에서 본원발명은 제2 열교환기(150)와 선박의 엔진 사이에는 제2 열교환기(150)를 통해 열교환이 이루어진 LNG 연료를 기화시키는 기화기(190)를 포함하여 구성된다. 이때, 기화기(190)는 가압 펌프(130)에 의해 가압되고 열교환이 이루어진 LNG 연료를 기화시킴으로써 엔진에서 요구하는 온도를 만드는 역할을 한다. 이러한 기화기는 열 매질로서 고온의 물 또는 스팀이 적용될 수 있다.In addition, in one embodiment, the present invention includes a vaporizer 190 for vaporizing the LNG fuel that has undergone heat exchange between the second heat exchanger 150 and the engine of the ship through the second heat exchanger 150 . At this time, the vaporizer 190 serves to create the temperature required by the engine by vaporizing the LNG fuel pressurized by the pressure pump 130 and heat exchanged. In such a vaporizer, hot water or steam may be applied as a thermal medium.
또한, 일 실시예에서 본원발명은 제1 열교환기(140)와 LNG 연료 탱크(100 사이에서 제1 열교환기(140)에 의해 냉각된 증발가스를 팽창시킴으로써 액화상태의 LNG 연료를 변환시킨 후 LNG 연료 탱크(10)로 공급되도록 하는 유량 제어 밸브(200)를 포함하여 구성된다.In addition, in one embodiment, the present invention converts the LNG fuel in a liquefied state by expanding the boil-off gas cooled by the first heat exchanger 140 between the first heat exchanger 140 and the LNG fuel tank 100 and then the LNG It is configured to include a flow control valve 200 to be supplied to the fuel tank (10).
유량 제어 밸브(200)는 줄-톰슨(Jule thomson) 밸브에 해당하며, 제1 열교환기(140)에 의해 냉각된 증발가스를 급격하게 팽창시킴으로써 압축 가스의 압력 강하를 통해 액화상태의 LNG 연료가 되도록 하여 LNG 연료 탱크(10)에 공급되도록 한다. 이러한 유량 제어 밸브(200)에 의해서 대략 영하 160도의 온도에서 재액화될 수 있다.The flow control valve 200 corresponds to a Joule-Thomson valve, and by rapidly expanding the boil-off gas cooled by the first heat exchanger 140 , the LNG fuel in the liquefied state is reduced through the pressure drop of the compressed gas. As possible, it is supplied to the LNG fuel tank 10 . It may be reliquefied at a temperature of approximately minus 160 degrees Celsius by the flow control valve 200 .
또한 일 실시예에서, 본원발명은 유량 제어 밸브(200)와 LNG 연료 탱크(10) 사이에서 유량 제어 밸브(200)를 통해 공급되는 액화상태의 LNG 연료에 잔류하는 증발가스를 분리한 후, 분리된 증발가스를 증발가스 압축기(110)로 재공급하는 기액분리기(210)를 포함하여 구성될 수 있다.In addition, in one embodiment, the present invention separates the boil-off gas remaining in the LNG fuel in the liquefied state supplied through the flow control valve 200 between the flow control valve 200 and the LNG fuel tank 10 and then separates It may be configured to include a gas-liquid separator 210 for re-supplying the boil-off gas to the boil-off gas compressor 110 .
기액분리기(210)는 유량 제어 밸브(200)에 의해 재액화된 LNG 연료를 LNG 연료 탱크(10) 내로 공급하기 위한 라인과, 재액화된 LNG 연료에서 잔류하는 증발가스를 분리시킨 후 분리된 증발가스를 다시 LNG 연료 탱크(10)와 증발가스 압축기(110)를 연결하는 증발가스 공급 라인으로 공급하기 위한 라인으로 구획된다.The gas-liquid separator 210 separates the line for supplying the reliquefied LNG fuel into the LNG fuel tank 10 by the flow control valve 200 and the BOG remaining in the reliquefied LNG fuel, and then the separated evaporation It is divided into a line for supplying gas to the boil-off gas supply line connecting the LNG fuel tank 10 and the boil-off gas compressor 110 again.
따라서 기액분리기(210)에 의해 분리된 증발가스는 다시 LNG 연료 탱크(10)로부터 공급되는 LNG 연료와 합류된 후 증발가스 압축기(110)로 공급되게 된다.Accordingly, the boil-off gas separated by the gas-liquid separator 210 is again supplied to the boil-off gas compressor 110 after being merged with the LNG fuel supplied from the LNG fuel tank 10 .
다음으로는, 도 2를 통해 LNG 증발가스를 재액화하는 과정을 순서대로 살펴보기로 한다.Next, a process of re-liquefying LNG boil-off gas will be described in order with reference to FIG. 2 .
먼저, LNG 연료 탱크(10)와 연결된 증발가스 압축기(110)를 이용하여 LNG 연료 탱크(10)로부터 배출되는 증발가스를 압축하게 된다(S201).First, the BOG discharged from the LNG fuel tank 10 is compressed using the BOG compressor 110 connected to the LNG fuel tank 10 (S201).
다음으로, LNG 연료 탱크(10) 내측에 마련되는 인 탱크 펌프(120)를 통해 LNG 연료를 가압시킨 후 인 탱크 펌프(120)와 연결된 가압 펌프(130)를 이용하여 엔진에서 요구하는 요구 압력을 형성시켜 엔진 방향으로 공급한다(S202).Next, after pressurizing the LNG fuel through the in-tank pump 120 provided inside the LNG fuel tank 10 , the pressure required by the engine is applied using the pressurization pump 130 connected to the in-tank pump 120 . formed and supplied in the engine direction (S202).
다음으로, 증발가스 압축기(110)와 가압 펌프(130)에 마련되는 제2 열교환기(150)를 통해, 가압 펌프(130)를 통해 공급되는 LNG 연료와 증발가스 압축기(110)를 통해 공급되는 증발가스를 서로 열교환시킴으로써, 증발가스를 1차적으로 냉각시키게 된다(S203).Next, through the second heat exchanger 150 provided in the BOG compressor 110 and the pressure pump 130 , the LNG fuel supplied through the pressure pump 130 and the BOG compressor 110 are supplied. By exchanging the BOG with each other, the BOG is primarily cooled (S203).
다음으로, 가압 펌프(130)와 인 탱크 펌프(120) 사이에 마련되는 제1 열교환기(140)를 통해, 인 탱크 펌프(120)를 통해 공급되는 LNG 연료와 제2 열교환기(150)를 통해 1차 냉각된 증발가스를 서로 열교환시킴으로써 증발가스를 2차적으로 냉각시켜 LNG 연료 탱크(10)로 공급하게 된다(S204).Next, through the first heat exchanger 140 provided between the pressure pump 130 and the in-tank pump 120 , the LNG fuel supplied through the in-tank pump 120 and the second heat exchanger 150 are mixed. By exchanging the primary cooled BOG with each other, BOG is secondarily cooled and supplied to the LNG fuel tank 10 (S204).
살펴본 바와 같이, 본원발명에 따르면 제1 열교환기(140) 및 제2 열교환기(150)를 이용하여 LNG 연료 탱크(10) 내 증발가스를 1차 및 2차로 재액화시킴으로써, 별도의 재액화 시스템이 갖추어지지 못한 중소형 선박에서도 버려지는 BOG를 효과적으로 재활용할 수 있도록 하는 이점을 가진다.As described above, according to the present invention, by using the first heat exchanger 140 and the second heat exchanger 150 to reliquefy the boil-off gas in the LNG fuel tank 10 to the primary and the secondary, a separate reliquefaction system This has the advantage of allowing the BOG to be effectively recycled even in small and medium-sized vessels that are not equipped.
상기에서는 본 발명의 바람직한 실시예를 참조하여 설명하였지만, 해당 기술 분야의 숙련된 당업자는 하기의 청구의 범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can.
본 발명에 따르면 별도의 재액화 시스템이 갖추어지지 못한 중소형 선박에서도 버려지는 BOG를 효과적으로 재활용될 수 있는 바, 본 발명은 LNG 산업분야에서 널리 이용하여 그 실용적이고 경게적인 가치를 실현할 수 있는 기술이다.According to the present invention, BOG thrown away can be effectively recycled even in small and medium-sized ships that are not equipped with a separate reliquefaction system. The present invention is a technology that can be widely used in the LNG industry to realize its practical and economical value.

Claims (8)

  1. LNG 연료 탱크와 연결되며, 상기 LNG 연료 탱크 내 증발가스(BOG)를 압축하는 증발가스 압축기;a boil-off gas compressor connected to the LNG fuel tank and compressing boil-off gas (BOG) in the LNG fuel tank;
    LNG 연료 탱크 내측에 마련되며, LNG 연료를 가압하여 엔진 방향으로 공급하는 인 탱크 펌프(In-tank pump);an in-tank pump provided inside the LNG fuel tank and supplying the LNG fuel to the engine by pressurizing it;
    상기 인 탱크 펌프와 연결되며, 상기 인 탱크 펌프를 통해 공급되는 LNG 연료를 가압하여 상기 엔진에서 요구하는 요구 압력을 형성하여 상기 엔진 방향으로 공급하는 가압 펌프;a pressurization pump connected to the in-tank pump, pressurizing the LNG fuel supplied through the in-tank pump to form a required pressure required by the engine, and supplying it to the engine;
    상기 인 탱크 펌프와 상기 가압 펌프 사이에 마련되며, 상기 인 탱크 펌프를 통해 공급되는 LNG 연료와 상기 증발가스 압축기를 통해 공급되는 증발가스를 서로 열교환시킴으로써 상기 증발가스를 냉각시키는 제1 열교환기; 및a first heat exchanger provided between the in-tank pump and the pressurization pump to cool the boil-off gas by exchanging heat between the LNG fuel supplied through the in-tank pump and the boil-off gas supplied through the boil-off gas compressor; and
    상기 가압 펌프와 상기 증발가스 압축기 사이에 마련되며, 상기 가압 펌프를 통해 공급되는 LNG 연료와 상기 증발가스 압축기를 통해 공급되는 증발가스를 서로 열교환시킴으로써 상기 증발가스를 냉각시키는 제2 열교환기;를 포함하며,a second heat exchanger provided between the pressurization pump and the boil-off gas compressor, the second heat exchanger cooling the boil-off gas by exchanging heat between the LNG fuel supplied through the pressurization pump and the boil-off gas supplied through the boil-off gas compressor and
    상기 증발가스 압축기를 통해 압축된 증발가스는 상기 제2 열교환기를 통해 1차 냉각이 이루어진 후, 상기 제1 열교환기를 통해 2차 냉각이 이루어지는 것을 특징으로 하는, 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템.The BOG compressed through the BOG compressor is first cooled through the second heat exchanger, and then secondary cooling is performed through the first heat exchanger. system.
  2. 제1항에 있어서,According to claim 1,
    상기 증발가스 압축기로 공급되는 증발가스와 상기 증발가스 압축기에 의해 압축이 완료된 증발가스를 서로 열교환시킴으로써,By heat-exchanging the BOG supplied to the BOG compressor and BOG compressed by the BOG compressor with each other,
    상기 증발가스 압축기에 의해 압축이 완료된 증발가스를 추가 냉각시키는 제3 열교환기;를 더 포함하는 것을 특징으로 하는, 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템.The LNG boil-off gas reliquefaction system for small and medium-sized LNG fuel propulsion ships, characterized in that it further comprises; a third heat exchanger for further cooling the boil-off gas compressed by the boil-off gas compressor.
  3. 제1항에 있어서,According to claim 1,
    상기 증발가스 압축기를 통해 압축된 증발가스를 재압축하는 증발가스 추가 압축기;를 더 포함하는 것을 특징으로 하는, 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템.The LNG boil-off gas reliquefaction system for a small and medium-sized LNG fuel propulsion ship, characterized in that it further comprises; a boil-off gas additional compressor for recompressing the boil-off gas compressed through the boil-off gas compressor.
  4. 제1항에 있어서,According to claim 1,
    상기 인 탱크 펌프와 상기 제1 열교환기 사이에 마련되며, 상기 인 탱크 펌프를 통해 가압된 LNG 연료를 추가 가압하는 부스터 펌프;를 더 포함하는 것을 특징으로 하는, 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템.A booster pump provided between the in-tank pump and the first heat exchanger to additionally pressurize the LNG fuel pressurized through the in-tank pump; liquefaction system.
  5. 제1항에 있어서,According to claim 1,
    상기 제2 열교환기와 상기 엔진 사이에는,Between the second heat exchanger and the engine,
    상기 제2 열교환기를 통해 열교환이 이루어진 LNG 연료를 기화시키는 기화기;가 마련되는 것을 특징으로 하는, 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템.An LNG boil-off gas reliquefaction system for a small and medium-sized LNG fuel propulsion ship, characterized in that it is provided;
  6. 제1항에 있어서,According to claim 1,
    상기 제1 열교환기와 상기 LNG 연료 탱크 사이에 마련되며, 제1 상기 열교환기에 의해 냉각된 상기 증발가스를 팽창시켜 액화상태의 LNG 연료로 변환시킨 후 상기 LNG 연료 탱크로 공급하는 유량 제어 밸브;를 더 포함하는 것을 특징으로 하는, 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템.a flow control valve provided between the first heat exchanger and the LNG fuel tank, which expands the boil-off gas cooled by the first heat exchanger, converts it into liquefied LNG fuel, and supplies it to the LNG fuel tank; An LNG boil-off gas reliquefaction system for small and medium-sized LNG fuel propulsion ships, characterized in that it comprises.
  7. 제6항에 있어서,7. The method of claim 6,
    상기 유량 제어 밸브와 상기 LNG 연료 탱크 사이에 마련되며, 상기 유량 제어 밸브를 통해 공급되는 액화상태의 LNG 연료에 잔류하는 증발가스를 분리한 후, 분리된 증발가스를 상기 증발가스 압축기로 재공급하는 기액분리기;를 더 포함하는 것을 특징으로 하는, 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템.It is provided between the flow control valve and the LNG fuel tank, and after separating BOG remaining in the LNG fuel in a liquefied state supplied through the flow control valve, the separated BOG is re-supplied to the BOG compressor. Gas-liquid separator; LNG boil-off gas reliquefaction system for small and medium-sized LNG fuel propulsion ships, characterized in that it further comprises.
  8. LNG 연료 탱크와 연결된 증발가스 압축기를 이용하여 상기 LNG 연료 탱크 내 증발가스(BOG)를 압축하는 단계;compressing the boil-off gas (BOG) in the LNG fuel tank using a boil-off gas compressor connected to the LNG fuel tank;
    상기 LNG 연료 탱크 내측에 마련된 인 탱크 펌프(In-tank pump)를 이용하여 LNG 연료를 가압한 후, 상기 인 탱크 펌프와 연결된 가압 펌프를 이용하여 엔진에서 요구하는 요구 압력을 형성시켜 엔진 방향으로 공급하는 단계;After pressurizing the LNG fuel using an in-tank pump provided inside the LNG fuel tank, a pressure required by the engine is formed using a pressurization pump connected to the in-tank pump and supplied in the engine direction. to do;
    상기 증발가스 압축기와 상기 가압 펌프 사이에 마련되는 제2 열교환기를 이용하여, 상기 가압 펌프를 통해 공급되는 LNG 연료와 상기 증발가스 압축기를 통해 공급되는 증발가스를 서로 열교환시킴으로써 상기 증발가스를 1차 냉각시키는 단계; 및Using a second heat exchanger provided between the BOG compressor and the pressurization pump, the BOG is primarily cooled by exchanging heat between the LNG fuel supplied through the pressurization pump and the BOG supplied through the BOG compressor. making; and
    상기 가압 펌프와 상기 인 탱크 펌프 사이에 마련되는 제1 열교환기를 이용하여, 상기 인 탱크 펌프를 통해 공급되는 LNG 연료와 상기 제2 열교환기를 통해 1차 냉각된 증발가스를 서로 열교환시킴으로써 상기 증발가스를 2차 냉각시킨 후 상기 LNG 연료 탱크로 공급하는 단계;를 포함하는 것을 특징으로 하는, 중소형 LNG 연료 추진선용 LNG 증발가스 재액화 시스템을 이용한 LNG 증발가스 재액화 방법.By using a first heat exchanger provided between the pressurization pump and the in-tank pump, the LNG fuel supplied through the in-tank pump and the boil-off gas primarily cooled through the second heat exchanger are exchanged with each other to heat the boil-off gas. After secondary cooling, supplying the LNG fuel tank to the LNG fuel tank; LNG boil-off gas reliquefaction method using an LNG boil-off gas reliquefaction system for small and medium-sized LNG fuel propulsion ships.
PCT/KR2021/000244 2020-02-20 2021-01-08 Lng boil-off gas reliquefaction system for small- and medium-sized lng-fueled ships, and lng boil-off gas reliquefaction method using same WO2021167245A1 (en)

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CN114017988A (en) * 2021-12-01 2022-02-08 上海齐耀动力技术有限公司 BOG (boil-off gas) reliquefaction circulation system for LNG (liquefied Natural gas) ship based on mixed working medium refrigeration technology

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