CN109126181A - A kind of methanol gas recovering device and recovery method - Google Patents
A kind of methanol gas recovering device and recovery method Download PDFInfo
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- CN109126181A CN109126181A CN201811226150.9A CN201811226150A CN109126181A CN 109126181 A CN109126181 A CN 109126181A CN 201811226150 A CN201811226150 A CN 201811226150A CN 109126181 A CN109126181 A CN 109126181A
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 420
- 238000011084 recovery Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010521 absorption reaction Methods 0.000 claims abstract description 113
- 238000009833 condensation Methods 0.000 claims abstract description 30
- 230000005494 condensation Effects 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 29
- 230000008929 regeneration Effects 0.000 claims abstract description 13
- 238000011069 regeneration method Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 230000002745 absorbent Effects 0.000 claims description 63
- 239000002250 absorbent Substances 0.000 claims description 63
- 239000007788 liquid Substances 0.000 claims description 41
- 239000000945 filler Substances 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 30
- 239000007921 spray Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000012856 packing Methods 0.000 claims description 17
- 238000012546 transfer Methods 0.000 claims description 17
- 238000005057 refrigeration Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 9
- 239000007789 gas Substances 0.000 description 107
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000002912 waste gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 239000004148 curcumin Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- -1 i.e. Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0054—General arrangements, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a kind of methanol gas recovering device and recovery method, device includes: the condensing circuit connected by pipeline and absorption and regeneration circuit.Method includes the following steps: (1) cryogenic condensation step；(2) processing step is absorbed；(3) absorption and regeneration step.The present invention can realize cooling fractional condensation recycling and the qualified discharge of methanol gas using condensation, absorption techniques, prevent the secondary pollution in methanol gas recycling and energy qualified discharge.
Description
Technical field
The present invention relates to methanol gas to be recycled field, especially a kind of methanol gas recovering device and recovery method.
Background technique
Methanol is both a kind of important Organic Chemicals, and a kind of important organic solvent or a kind of excellent combustion
Material.Methanol industry is widelyd popularize in China in recent years, is emerged rapidly.With the enhancing and sustainable development of environmental consciousness
It is required that methanol gas recycling, control will will receive more and more attention.Methanol is in production, handling and application process
A large amount of methanol and air gas mixture can be given off, if the mixed gas direct emission, not only causes resources loss, more constitute
Potential fire hazard, has seriously polluted the environment simultaneously, endangers the health of worker.
It is investigated that entitled " a kind of methanol waste gas recovery system ", Patent No. ZL201510465554.3, using " absorb+
Absorption " is integrated to recycle methanol and uses water as the technology that absorbent absorbs methanol waste gas, solves methanol in very big level
Waste gas recovery problem, but this technique produces new pollution sources --- wastewater containing methanol, the policy phase with national energy conservation and emission reduction
A left side can reprocess the unit of sewage disposal system, and storage and transport unit is just deeply aware of one's own helplessness when faced with a great task.
It is investigated that entitled " a kind of methanol loop recovery system ", Patent No. 201520342588.9, using " condensation+
Absorption " group technology takes full advantage of the operating condition that operating condition, the absorption method that condensation method is suitble to methanol concentration high are suitble to methanol concentration low
Feature.Which solve methanol waste gas to recycle problem, also has economic recovery value, but this technique generates new pollutant ---
Active carbon solid waste, and 50mg/m is required for newest standards3It is beyond one's ability to help.
So far, there has been no the mature methanol gas recycling that meets, there is no secondary pollution and energy qualified discharges in the market
Device.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of methanol gas recovering device and recovery method, Neng Gouli
Cooling fractional condensation recycling and the qualified discharge that methanol gas is realized with condensation, absorption techniques, prevent secondary in methanol gas recycling
Pollution and energy qualified discharge.
In order to solve the above technical problems, a kind of methanol gas recovering device provided by the invention comprising: it is connected by pipeline
Condensing circuit and absorption and regeneration circuit；
Condensing circuit includes the refrigeration compressor sequentially connected, high-efficiency oil separator, condensing heat exchanger, restricting element, cold
Case heat exchanger and gas-liquid separator, the gas-liquid separator are connect with refrigeration compressor；The ice chest exchanger base offers
Liquid outlet；
Absorption and regeneration circuit include tourie, absorption tower, first outlet switching valve, emptying cylinder, second outlet switching valve and
Frequency conversion air pump；Tourie and absorption tower connect and compose absorbent circulated sprinkling circuit by circulating pump；The outlet of frequency conversion air pump with
The liquid passage inlet of ice chest heat exchanger is connected, and the gas circuit outlet of ice chest heat exchanger is connected with the air inlet of absorb the bottom of the tower；Absorption tower
The gas outlet on top is connected by first outlet switching valve with emptying cylinder, while passing through second outlet switching valve and frequency conversion air pump
Entrance is connected, and the entrance of frequency conversion air pump is also connected with oil gas entrance switching valve.
Preferably, wherein absorbent circulated sprinkling circuit is that the absorbent in tourie is extracted into absorption tower by circulating pump
Top spray and fall after rise again via filler into tourie so that absorbent is by circulating pump between tourie and absorption tower
The absorbent circulated sprinkling circuit of reciprocation cycle.
Preferably, the absorption tower includes tower body, is filled in the intracorporal filler of absorption tower chamber and is located at absorption tower chamber
The absorbent spray equipment on body top；The cavity of the tourie be for contain stripping liquid and it is interior be equipped with helical form in
The inner cavity of coil pipe；In the absorbent circulated sprinkling circuit that the tourie and absorption tower are connected and composed by circulating pump: absorption tower
Cavity be connected to the cavity of tourie for being located at its underpart, the liquid outlet of tourie lower part and the spray dress on absorption tower top
Circulating pump is equipped between the inlet set.
It is further preferred that wherein the entrance of frequency conversion air pump is connected by the first fire arrester with oil gas entrance switching valve；Become
The outlet of frequency air pump is connected by the second fire arrester with the liquid passage inlet of ice chest heat exchanger；First outlet switching valve is hindered by third
Firearm is connected with emptying cylinder.
Preferably, refrigeration compressor is explosion-proof refrigeration compressor, and frequency conversion air pump is flame-proof converter air pump, oil transfer pump and circulation
Pump is that explosion-proof centrifugal pumps.Preferably, the filler in absorption tower is random packing or structured packing.
It is further preferred that the device further includes Methanol Recovery storage tank；The liquid outlet of ice chest exchanger base is connected with back
The entrance of oil pipe, Methanol Recovery storage tank is connected to by visor with the oil return pipe of ice chest exchanger base, and Methanol Recovery storage tank goes out
Mouth is connected with oil transfer pump；The second fluid level controller on oil transfer pump and Methanol Recovery storage tank is chain.
Preferably, the first fluid level controller is additionally provided in the cavity of tourie.
Preferably, the intracorporal helical form inner coil pipe of tourie chamber is the stainless steel spiral shape that can introduce saturated vapor or hot water
Inner coil pipe.
More preferably, the filler in absorption tower is the structured packing of stainless steel efficient corrugated.In the present invention in absorption tower
The preferred structured packing of filler, the especially structured packing of stainless steel efficient corrugated, purposes are that absorbent is allowed to come into full contact with gas, are mentioned
High-selenium corn efficiency, structured packing are more preferable than random packing effect.
Preferably, being arranged side by side in ice chest heat exchanger has the first awkward silence at a meeting, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting, the
One awkward silence at a meeting, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting bottom correspondence are provided with the liquid outlet being connected to heat exchanger channels；First is cold
Field, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting temperature successively reduce.
Invention also provides a kind of methanol gas recovery methods comprising following steps:
(1) cryogenic condensation step: methanol gas is passed through in ice chest heat exchanger by frequency conversion air pump, by the circulation of condensing circuit
It is cooling, make methanol gas cooling liquid, 99% or more methanol gas is cooled to liquid, by the liquid outlet of ice chest exchanger base
Recycling, methanol content≤400mg/m in the gas of the gas circuit outlet of ice chest heat exchanger after condensation3；
(2) absorb processing step: second outlet switching valve is closed, and first outlet switching valve is opened, after condensation process
Methanol gas is input in absorption tower, is filled through abundant in the intracorporal filler of absorption tower chamber and the absorbent under spraying that moves in circles
Contact is to carry out absorption processing to the methanol in gas, methanol content≤50mg/m in the gas that absorbs that treated3, up to standard to be discharged into
Into atmosphere；
(3) absorption and regeneration step: being saturated when absorbent absorbs, and second outlet switching valve is opened, and first outlet switching valve is closed
It closes, is passed through steam or hot water into the intracorporal inner coil pipe of tourie chamber and heating parsing is carried out to absorbent indirectly, absorption is being inhaled
Receive agent in methanol be desorbed out, by second outlet switching valve return to condensation front end, and then by frequency conversion air pump enter it is next
A cryogenic condensation step, while absorbent is restored to reset condition.
Preferably, it is filled through in the step (2) in the intracorporal filler of absorption tower chamber and the absorption under spraying that moves in circles
Agent comes into full contact with to carry out the step of absorbing processing to the methanol in gas and specifically include: by circulating pump by the suction in tourie
The top that receipts agent is extracted into absorption tower sprays falls after rise via filler into tourie again, so that absorbent is being inhaled by circulating pump
Reciprocation cycle between closed cans and absorption tower；Methanol gas after condensation process is input in absorption tower, via being filled in absorption tower
Absorbent under the intracorporal filler of chamber and spray, which comes into full contact with, carries out absorption processing to the methanol in gas.
Preferably, methanol gas described in step (1) is passed through in ice chest heat exchanger, successively by the first awkward silence at a meeting, the
Two awkward silences at a meeting, third awkward silence at a meeting, the 4th awkward silence at a meeting and refrigerant and cold methanol gas carry out heat exchange processing, finally obtain -75 ± 3 DEG C of first
Alcohol gas；Then -75 ± 3 DEG C of methanol gas successively passes through the 4th awkward silence at a meeting, third awkward silence at a meeting, the second awkward silence at a meeting, the first awkward silence at a meeting and rises again
It is input to after processing in absorption tower and carries out absorption processing；It is 25 ± 3 DEG C that first awkward silence at a meeting, which is backheat awkward silence at a meeting its treatment temperature, second
The treatment temperature of awkward silence at a meeting is 4 ± 3 DEG C, and the treatment temperature of third awkward silence at a meeting is -25 ± 3 DEG C, the treatment temperature of the 4th awkward silence at a meeting is -75 ±
3℃。
The invention has the benefit that (1) present invention passes through condensing circuit, the recycling of absorption and regeneration circuit and purifying methanol gas
Body, final methanol gas concentration are lower than 50mg/m3Requirement, complete qualified discharge；(2) methanol that present absorbent parses
Gas is passed through saturated vapor by inner coil pipe or hot water heating is detached from, into the entrance of the frequency conversion air pump of condensation front end, under
Primary recycling circulation, is handled again, has prevented the secondary pollution of unit in operation；(3) structure of the invention is compact, land occupation
Area is small, and unit can be supervised according to fully automatic operation is preset without special messenger after connecting；(4) further, the present invention adopts
It prevents flame from scurrying into next link with fire arrester or flame is prevented to spread in pipeline enclosure, keep device more safe and reliable；(5) into one
Step, mechanical moving element of the present invention are explosion-proof type, and the tail gas of package unit and discharge all meets fire-proof and explosion-proof safety standard；
(6) further, it is provided with different awkward silences at a meeting in condensing heat-exchange case of the present invention, gradual change cooling can be carried out to oil gas, reduction finishes
White phenomenon more effectively condenses methanol gas, and can carry out warming up treatment to condensed gas, into absorption cycle；(7)
Further, filler, especially stainless steel corrugated regular filler are provided in absorption tower of the present invention, one side gas connects with absorbent
Contacting surface product can come into full contact with greatly, and another aspect filler surface wettability is strong, and absorption efficiency is high；(8) further, based on the present invention
In the structure basis of offer, the gas after condensation process is further filled through in the intracorporal filler of absorption tower chamber and the spray that moves in circles
The lower absorbent of leaching comes into full contact with to carry out absorption processing to the methanol in gas, i.e., absorbent by circulating pump tourie with
It reciprocation cycle and is come into full contact with by spray process through filler and the methanol in gas between absorption tower, so that absorption be better achieved
Agent fully absorbs methanol remaining in gas, and assimilation effect is more preferable and saves water, and effectively prevents new pollution sources such as
The generation of wastewater containing methanol, energy conservation and environmental protection.
Detailed description of the invention
Fig. 1 is the device of the invention structural schematic diagram.
Fig. 2 is methanol gas disposal flow diagram of the invention.
Wherein, 101, refrigeration compressor；102, high-efficiency oil separator；103, condensing heat exchanger；104, restricting element；
105, ice chest heat exchanger；106, gas-liquid separator；201, visor；202, Methanol Recovery storage tank；203, oil transfer pump；301, it absorbs
Tank；302, circulating pump；303, absorption tower；401, frequency conversion air pump；402, the second fire arrester；403, first outlet switching valve；404,
Empty cylinder；405, second outlet switching valve；406, third fire arrester；407, the first fire arrester；408, import switching valve.
Specific embodiment
Embodiment 1: a kind of methanol gas recovering device of the present embodiment includes condensing circuit, absorption and regeneration circuit, described cold
Solidifying circuit include the refrigeration compressor 101 sequentially connected, high-efficiency oil separator 102, condensing heat exchanger 103, restricting element 104,
Ice chest heat exchanger 105 and gas-liquid separator 106, gas-liquid separator 106 are also connect with refrigeration compressor 101, form closed system
SAPMAC method system.105 bottom of ice chest heat exchanger offers liquid outlet.
Absorption and regeneration circuit includes tourie 301, absorption tower 303, first outlet switching valve 403, emptying cylinder 404, second
Export switching valve 405 and frequency conversion air pump 401；Tourie 301 and absorption tower 303 connect and compose absorbent by circulating pump 302 and follow
Ring spray drenches circuit；The outlet of frequency conversion air pump 401 is connected with the liquid passage inlet of ice chest heat exchanger 105, the gas circuit of ice chest heat exchanger 105
Outlet is connected with the air inlet of 303 bottom of absorption tower；The gas outlet on 303 top of absorption tower by first outlet switching valve 403 with
It empties cylinder 404 to be connected, while the gas outlet on 303 top of absorption tower entering by second outlet switching valve 405 and frequency conversion air pump 401
Mouth is connected, and the entrance of frequency conversion air pump 401 is also connected with oil gas entrance switching valve 408.
Wherein absorbent circulated sprinkling circuit is that the absorbent in tourie 301 is extracted into absorption tower by circulating pump 302
303 top sprays falls after rise via filler into tourie 301 again, so that absorbent is by circulating pump 302 in tourie
The absorbent circulated sprinkling circuit of reciprocation cycle between 301 and absorption tower 303.
Refrigeration compressor 101 uses explosion-proof refrigeration compressor in the present embodiment, and frequency conversion air pump 401 uses flame-proof converter wind
Pump, oil transfer pump 203 and circulating pump 302 are all made of explosion-proof centrifugal pump.
The cavity of tourie 301 is interior to be equipped with helical form inner coil pipe for containing stripping liquid in the present embodiment.It is described
Helical form inner coil pipe is the inner coil pipe that can introduce saturated vapor or hot water, can introduce saturated vapor by interface or hot water is indirect
Heating parsing is carried out to the absorbent in tourie and/or absorption tower.Absorbent is water in the present embodiment；Inner coil pipe uses spiral
Shape stainless steel inner coil pipe.
Absorption tower 303 includes tower body, is filled in the intracorporal filler of absorption tower chamber and is located at absorption tower cavity in the present embodiment
The absorbent spray equipment on top.
Above-mentioned tourie 301 and absorption tower 303 pass through in the absorbent circulated sprinkling circuit that circulating pump 302 connects and composes:
The cavity on absorption tower 303 is connected to the cavity for the tourie 301 for being located at its underpart, the liquid outlet of 301 lower part of tourie and suction
It receives and is equipped with circulating pump 302 between the inlet of the spray equipment on 303 top of tower.
It only can be just used for by introducing saturated vapor or hot water in absorption and regeneration step in inner coil pipe in the present embodiment
Indirect evaporation parses absorbent, and steam or hot water meeting low level emptying do not work in inner coil pipe when usually absorbing processing step.It inhales
Receiving agent spray equipment is the device that spiral nozzle or groove type distributor etc. can play the role of uniform spray, will be pumped into through circulation
Packing layer upper surface is uniformly sprayed to the absorbent in the inlet on absorption tower top.Position in tourie 301 in the present embodiment
It is loaded with to account for about as the water of absorbent in cavity outside the inner coil pipe and absorbs 85% or so of tank volume, circulating pump 302 will
Absorbent in tourie 301 is extracted into 303 top of absorption tower and sprays, and absorbent is inhaled by spray process through filler and input
The methanol gas received in tower comes into full contact with, and fully absorbs to the methanol in gas；Simultaneously the absorbent that sprays via
Filler is fallen after rise into tourie, so that absorbent is by circulating pump, the reciprocation cycle composition absorbent between tourie and absorption tower is followed
Ring spray drenches circuit.
Filler in absorption tower is random packing or structured packing.Filler in the present embodiment absorption tower is that stainless steel is efficient
Corrugated regular filler, purposes are that absorbent is allowed to come into full contact with gas, improve absorption efficiency.Certainly it also may be selected to use Bauer
The random packings such as ring, Raschig ring, cascade ring, structured packing especially stainless steel efficient corrugated structured packing is than random packing effect
More preferably.
Being arranged side by side in ice chest heat exchanger 105 has the first awkward silence at a meeting, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting, and first is cold
Field, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting bottom it is corresponding be provided be connected to the heat exchanger channels in ice chest heat exchanger out
Liquid mouth；First awkward silence at a meeting, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting temperature successively reduce.
Methanol gas recovery method provided in this embodiment includes the following steps:
(1) cryogenic condensation step: methanol gas is passed through in ice chest heat exchanger 105 by frequency conversion air pump 401, is included refrigeration pressure
Contracting machine 101, condensing heat exchanger 103 condensing circuit classification cycle it is cooling, keep the methanol gas in ice chest heat exchanger 105 cooling
To -75 DEG C or so, 99% or more methanol gas is cooled to liquid, is recycled by the liquid outlet of 105 bottom of ice chest heat exchanger, condensation
The methanol gas concentration of gas circuit outlet after processing positioned at ice chest heat exchanger is lower, is near net methanol gas, and methanol content is insufficient
400mg/m3；
(2) absorb processing step: second outlet switching valve 405 is closed, and first outlet switching valve 403 is opened, at condensation
Near net methanol gas after reason is input in absorption tower 303, is filled through in the intracorporal filler of absorption tower chamber and the spray that moves in circles
Under absorbent come into full contact with to carry out absorption processing to the methanol in gas, 99.9% or more methanol gas is cleaned, inhale
It receives treated gas methanol content and is lower than 50mg/m3, up to standard and can be drained into atmosphere safely；
(3) absorption and regeneration step: after absorbent, which absorbs, to be saturated, second outlet switching valve 405 is opened, first outlet switching
Valve 403 is closed, while the characteristic enhanced using molecular activity with temperature raising, to the intracorporal inner coil pipe of 301 chamber of tourie
In be passed through saturated vapor or hot water heating parsing carried out to absorbent indirectly, the methanol desorption absorbed in absorbent is parsed
Come, condensation front end is returned to by second outlet switching valve 405, and then next cryogenic condensation is entered by frequency conversion air pump 401 and is walked
Suddenly, while absorbent is restored to reset condition.
Methanol gas described in above-mentioned steps (1) is passed through in ice chest heat exchanger, successively by the first awkward silence at a meeting, the second awkward silence at a meeting,
Third awkward silence at a meeting, the 4th awkward silence at a meeting and refrigerant and cold methanol gas carry out heat exchange processing, finally obtain -75 ± 3 DEG C of methanol gas；
Then -75 ± 3 DEG C of methanol gas successively passes through the 4th awkward silence at a meeting, third awkward silence at a meeting, the second awkward silence at a meeting, the first awkward silence at a meeting warming up treatment, so
It is input in absorption tower by the gas circuit outlet of ice chest heat exchanger afterwards and carries out absorption processing；First awkward silence at a meeting is its processing of backheat awkward silence at a meeting
Temperature is 25 ± 3 DEG C, and the treatment temperature of the second awkward silence at a meeting is 4 ± 3 DEG C, and the treatment temperature of third awkward silence at a meeting is -25 ± 3 DEG C, and the 4th is cold
The treatment temperature of field is -75 ± 3 DEG C.Inlet channel and return gas channel, the gas circuit of ice chest heat exchanger are respectively included in each awkward silence at a meeting
Import successively with each inlet channel of first to fourth awkward silence at a meeting, each return gas channel of the four to the first awkward silence at a meeting, ice chest heat exchanger
Gas circuit outlet is sequentially communicated composition heat exchanger channels.Specifically: the inlet channel of first to fourth awkward silence at a meeting is sequentially communicated, and the 4th to
The return gas channel of one awkward silence at a meeting is sequentially communicated, and the inlet channel of the 4th awkward silence at a meeting is connected to the return gas channel of the 4th awkward silence at a meeting, the first awkward silence at a meeting
Inlet channel be connected to the liquid passage inlet of ice chest heat exchanger, the gas circuit of the return gas channel of the first awkward silence at a meeting and ice chest heat exchanger exports
Connection.The inlet channel and return gas channel of each awkward silence at a meeting are longitudinally arranged in parallel.Further include in second, third and the 4th awkward silence at a meeting with
Respective inlet channel and return gas channel refrigerant line disposed in parallel.
Above-mentioned cold methanol gas refers to the methanol gas in ice chest heat exchanger in warming up treatment, compared in heat exchange processing
Methanol gas temperature it is low.Namely: obtained -75 ± 3 DEG C of methanol gas is just successively by the 4th awkward silence at a meeting, the after heat exchange processing
Three awkward silences at a meeting, the second awkward silence at a meeting, the first awkward silence at a meeting are to transfer to methanol gas that ice chest heat exchanger gas circuit exports, in warming up treatment.
It is filled through in above-mentioned steps (2) and is sufficiently connect in the intracorporal filler of absorption tower chamber and the absorbent under spraying that moves in circles
Touching the step of carrying out absorption processing to the methanol in gas to specifically include: being extracted into the absorbent in tourie by circulating pump
The top on absorption tower sprays falls after rise via filler into tourie again, so that absorbent is by circulating pump in tourie and suction
Reciprocation cycle between receipts tower；Methanol gas after condensation process is input in absorption tower 303, via being filled in the cavity of absorption tower
Filler and spray under absorbent come into full contact with absorption processing carried out to the methanol in gas.
Embodiment 2: essentially identical with 1 structure of embodiment, something in common is not repeated, except that:
The entrance of frequency conversion air pump 401 is connected by the first fire arrester 407 with oil gas entrance switching valve 408 in the present embodiment,
And the entrance of frequency conversion air pump 401 is connected by the first fire arrester 407 with second outlet switching valve (405)；Frequency conversion air pump 401
Outlet is connected by the second fire arrester 402 with the liquid passage inlet of ice chest heat exchanger 105；First outlet switching valve 403 passes through third
Fire arrester 406 is connected with emptying cylinder 404.Fire arrester design is in frequency conversion air pump front and back end and emptying cylinder front end, for preventing flame
It scurries into next link or flame is prevented to spread in pipeline enclosure.
The first fluid level controller is additionally provided in the present embodiment in the cavity of tourie 301, for monitoring stripping liquid
Water level.
The device further includes Methanol Recovery storage tank 202 in the present embodiment, the liquid outlet that 105 bottom of ice chest heat exchanger opens up with
Methanol Recovery storage tank 201 connects.Specifically: the liquid outlet of 105 bottom of ice chest heat exchanger is connected with oil return pipe；Methanol Recovery storage tank
202 entrance is connected to by visor 201 with the oil return pipe of 105 bottom of ice chest heat exchanger, and the outlet of Methanol Recovery storage tank 202 connects
It is connected to oil transfer pump 203.
The second fluid level controller in the present embodiment on oil transfer pump 203 and Methanol Recovery storage tank 202 is chain.Wherein oil transfer pump
203 pass through the second fluid level controller circuit connection on PLC chip and Methanol Recovery storage tank 202, and PLC is selected in the present embodiment
Siemens S7-1200 or S7-300, naturally it is also possible to flexibly select other models as needed.
On the basis of the said structure, bottom is passed through by the condensed methanol solution of ice chest heat exchanger 105 in the present embodiment
Oil return pipe flows into Methanol Recovery storage tank 202 through visor 201, then is sent by oil transfer pump 203 to user's storage tank；It can through visor 201
Be intuitive to see by methanol solution condensation effect；The second fluid level controller on oil transfer pump 203 and Methanol Recovery storage tank 202
It is chain, the methanol being collected into be transferred out in real time, namely: upper liquid level provides signal when Methanol Recovery storage tank 202 collects full
Start oil transfer pump, liquid level provides signal-off oil transfer pump to 202 slack tank of Methanol Recovery storage tank at present.
Embodiment 3: the methanol gas recovering device of the present embodiment, treating capacity 400m3/ h, structure is same as Example 2,
Be configured mainly to: level-one refrigeration compressor selects CSR170Ex (containing again in Taiwan) explosion-proof helical-lobe compressor, second level refrigeration compressor
4GE-23 (German Bitzer) piston compressor is selected, condensing heat exchanger is VLV442 (Nanjing is all happy), ice chest heat exchanger ZB400
(Nanjing is all happy), flame-proof converter air pump select FSR100 (Feng Yuan is mechanical), and absorption tower XST400 × 4500 (Nanjing is all happy) is not
Rust steel material, tourie XSG4000 (Nanjing is all happy) are stainless steel material, and oil transfer pump and circulating pump are YG25/YG40 (Kai Quan),
Explosion-proof type fire arrester FA-E-100 (German PROTEGO), electric elements are Schneider, and control system is Siemens S7-1200.
The total power consumption of the present embodiment is 60.9kW, and outer dimension is 12000 × 2550 × 6700mm.Methanol gas detailed data is shown in Table 1:
1 methanol gas detailed data of table
The methanol gas provided such as Fig. 2 absorbs in each test point shown in process flow, and at 1 corresponding air inlet, 2 is corresponding
The exit of first awkward silence at a meeting inlet channel, the exit of 3 corresponding second awkward silence at a meeting inlet channels, 4 corresponding third awkward silence at a meeting inlet channels
Exit, the exit of 5 corresponding 4th awkward silence at a meeting return gas channels, at 6 corresponding absorption tower top gas outlets, respectively with 6 in table 1
A test point corresponds, and embodies the processing result of different links.
From Figure 2 it can be seen that in the gas to be processed being located at the air inlet of corresponding test point 1, containing 80% air,
2% water and 18% methanol (wherein % be molar percentage), methanol concentration is 281.94g/m at this time3；Through ice chest heat exchanger
After the processing of 105 cryogenic condensations, 99% or more methanol gas, which is cooled to liquid, to be recycled by the liquid outlet of ice chest exchanger base,
After condensation process in the gas of the outlet of the 4th awkward silence at a meeting return gas channel of ice chest heat exchanger (corresponding test point 5), contain
99.997% air, 0.001% water and 0.002% methanol, methanol concentration is reduced to 0.35g/m at this time3, methanol gas
Concentration is lower, and for clean methanol gas, methanol content is less than 400mg/m3；And then gas enters in absorption tower through filler and circulation
The lower absorbent of reciprocal spray comes into full contact with absorption processing is carried out to the methanol in gas after, positioned at the absorption of correspondence test point 6
Tower top is brought out in the gas at port, containing 97.999% air, 2% water and 0.001% methanol, first in gas at this time
Determining alcohol further decreases as 0.023g/m3, 99.9% or more methanol gas is cleaned, and absorbing that treated, gas methanol contains
Amount is lower than 50mg/m3, up to standard and can be drained into atmosphere safely.
The above implementation column does not constitute restriction to the present invention, and relevant staff is in the range without departing from technical thought of the invention
Various change and modification that are interior, being carried out, fall within the scope of protection of the present invention.
Claims (10)
1. a kind of methanol gas recovering device characterized by comprising the condensing circuit and absorption and regeneration connected by pipeline returns
Road；
Condensing circuit include the refrigeration compressor (101) sequentially connected, high-efficiency oil separator (102), condensing heat exchanger (103),
Restricting element (104), ice chest heat exchanger (105) and gas-liquid separator (106), the gas-liquid separator (106) and refrigerant compression
Machine (101) connection；Ice chest heat exchanger (105) bottom offers liquid outlet；
Absorption and regeneration circuit include tourie (301), absorption tower (303), first outlet switching valve (403), emptying cylinder (404),
Second outlet switching valve (405) and frequency conversion air pump (401)；Tourie (301) and absorption tower (303) are connected by circulating pump (302)
It connects and constitutes absorbent circulated sprinkling circuit；The outlet of frequency conversion air pump (401) is connected with the liquid passage inlet of ice chest heat exchanger (105),
The gas circuit outlet of ice chest heat exchanger (105) is connected with the air inlet of absorption tower (303) bottom；The outlet on absorption tower (303) top
Mouth is connected by first outlet switching valve (403) with emptying cylinder (404), while passing through second outlet switching valve (405) and frequency conversion
The entrance of air pump (401) is connected, and the entrance of frequency conversion air pump (401) is also connected with oil gas entrance switching valve (408).
2. methanol gas recovering device as described in claim 1, which is characterized in that wherein absorbent circulated sprinkling circuit is to pass through
Circulating pump (302) sprays the top that the absorbent in tourie (301) is extracted into absorption tower (303) to be fallen after rise via filler again
Into tourie (301), so that absorbent passes through circulating pump (302) reciprocation cycle between tourie (301) and absorption tower (303)
Absorbent circulated sprinkling circuit.
3. methanol gas recovering device as described in claim 1, which is characterized in that the absorption tower (303) includes tower body, filling
In the intracorporal filler of absorption tower chamber and absorbent spray equipment positioned at absorption tower cavity top；The chamber of the tourie (301)
Body is for containing stripping liquid and the interior inner cavity equipped with helical form inner coil pipe；The tourie (301) and absorption tower
(303) in the absorbent circulated sprinkling circuit connected and composed by circulating pump (302): the cavity of absorption tower (303) be located at it
The cavity of the tourie (301) of lower part is connected to, the liquid outlet of tourie (301) lower part and the spray on absorption tower (303) top
Circulating pump (302) are equipped between the inlet of device.
4. methanol gas recovering device as described in claim 1, which is characterized in that the entrance of frequency conversion air pump (401) passes through first
Fire arrester (407) is connected with oil gas entrance switching valve (408), and passes through the first fire arrester 407 and second outlet switching valve (405)
It is connected；The outlet of frequency conversion air pump (401) is connected by the second fire arrester (402) with the liquid passage inlet of ice chest heat exchanger (105)；The
One outlet switching valve (403) is connected by third fire arrester (406) with emptying cylinder (404).
5. methanol gas recovering device as described in claim 1, which is characterized in that refrigeration compressor (101) is explosion-proof refrigeration pressure
Contracting machine, frequency conversion air pump (401) are that flame-proof converter air pump, oil transfer pump (203) and circulating pump (302) pump for explosion-proof centrifugal；Absorption tower
In filler be random packing or structured packing.
6. methanol gas recovering device as described in claim 1, which is characterized in that the device further includes Methanol Recovery storage tank
(202)；The liquid outlet of ice chest heat exchanger (105) bottom is connected with oil return pipe, and the entrance of Methanol Recovery storage tank (202) passes through visor
(201) it is connected to the oil return pipe of ice chest heat exchanger (105) bottom, the outlet of Methanol Recovery storage tank (202) is connected with oil transfer pump
(203)；The second fluid level controller on oil transfer pump (203) and Methanol Recovery storage tank (202) is chain；
The first fluid level controller is additionally provided in the cavity of tourie (301)；The intracorporal helical form inner coil pipe of tourie chamber is that can draw
Enter the stainless steel spiral shape inner coil pipe of saturated vapor or hot water；Filler in absorption tower is the structured packing of stainless steel efficient corrugated.
7. methanol gas recovering device as described in claim 1, which is characterized in that being arranged side by side in ice chest heat exchanger (105) has
First awkward silence at a meeting, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting, the first awkward silence at a meeting, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting bottom
Correspondence is provided with the liquid outlet being connected to heat exchanger channels；First awkward silence at a meeting, the second awkward silence at a meeting, third awkward silence at a meeting and the 4th awkward silence at a meeting temperature are successively
It reduces.
8. a kind of methanol gas recovery method, which comprises the steps of:
(1) cryogenic condensation step: methanol gas is passed through in ice chest heat exchanger (105) by frequency conversion air pump (401), by condensing circuit
Circulating cooling, make methanol gas cooling liquid, 99% or more methanol gas is cooled to liquid, by ice chest heat exchanger (105)
The liquid outlet of bottom recycles, methanol content≤400mg/m in the gas of the gas circuit outlet of ice chest heat exchanger after condensation3；
(2) absorb processing step: second outlet switching valve (405) is closed, and first outlet switching valve (403) is opened, at condensation
Methanol gas after reason is input in absorption tower (303), is filled through in the intracorporal filler of absorption tower chamber and is moved in circles under spray
Absorbent come into full contact with to carry out absorption processing to the methanol in gas, methanol content in the gas that absorbs that treated≤
50mg/m3, up to standard to be drained into atmosphere；
(3) it absorption and regeneration step: is saturated when absorbent absorbs, second outlet switching valve (405) is opened, first outlet switching valve
(403) it closes, is passed through steam or hot water into the intracorporal inner coil pipe of tourie (301) chamber and heating solution is carried out to absorbent indirectly
The methanol absorbed in absorbent is desorbed out by analysis, returns to condensation front end, Jin Ertong by second outlet switching valve (405)
It crosses frequency conversion air pump (401) and enters next cryogenic condensation step, while absorbent is restored to reset condition.
9. methanol gas recovery method as claimed in claim 8, which is characterized in that be filled through in the step (2) in absorption tower
The intracorporal filler of chamber comes into full contact with the absorbent under spraying that moves in circles absorb to the methanol in gas the step of processing
Suddenly it specifically includes: the top that the absorbent in tourie is extracted into absorption tower being sprayed by circulating pump and is fallen after rise again via filler
Into tourie, so that absorbent passes through circulating pump reciprocation cycle between tourie and absorption tower；By the methanol after condensation process
Gas is input in absorption tower (303), is come into full contact with via the intracorporal filler of absorption tower chamber is filled in the absorbent under spray
Absorption processing is carried out to the methanol in gas.
10. methanol gas recovery method as claimed in claim 8, which is characterized in that methanol gas described in step (1) is passed through cold
In case heat exchanger, successively by the first awkward silence at a meeting, the second awkward silence at a meeting, third awkward silence at a meeting, the 4th awkward silence at a meeting and refrigerant and cold methanol gas into
Row heat exchange processing, finally obtains -75 ± 3 DEG C of methanol gas；Then -75 ± 3 DEG C of methanol gas successively pass through the 4th awkward silence at a meeting,
It is input in absorption tower after third awkward silence at a meeting, the second awkward silence at a meeting, the first awkward silence at a meeting warming up treatment and carries out absorption processing；First awkward silence at a meeting is backheat
Its treatment temperature of awkward silence at a meeting is 25 ± 3 DEG C, and the treatment temperature of the second awkward silence at a meeting is 4 ± 3 DEG C, and the treatment temperature of third awkward silence at a meeting is -25 ± 3
DEG C, the treatment temperature of the 4th awkward silence at a meeting is -75 ± 3 DEG C.
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| CN109126181B (en) | 2024-07-02 |
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