CN105838465B - Utilize the technique and system of Fischer-Tropsch process exhaust preparing liquefied natural gas - Google Patents
Utilize the technique and system of Fischer-Tropsch process exhaust preparing liquefied natural gas Download PDFInfo
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- CN105838465B CN105838465B CN201610342193.8A CN201610342193A CN105838465B CN 105838465 B CN105838465 B CN 105838465B CN 201610342193 A CN201610342193 A CN 201610342193A CN 105838465 B CN105838465 B CN 105838465B
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- tropsch process
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
Abstract
The technique and system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein system include：First cooler, the second cooler, heavy hydrocarbon scrubbing tower, water scrubber, absorption tower, regenerator, molecular sieve drying device, sulfur loading active carbon bed and liquefaction separation device.Technique using Fischer-Tropsch process exhaust preparing liquefied natural gas includes：Step 1: preliminary cooling；Step 2: cool down again；Step 3: carry out heavy hydrocarbon washing；Step 4: washing；Step 5: carbonization treatment；Step 6: processing is dried；Step 7: to being dried that treated, Fischer-Tropsch process exhaust carries out demercuration processing；Step 8: liquefaction separation is carried out to demercuration treated Fischer-Tropsch process exhaust.Technical scheme of the present invention can adequately remove the impurity such as heavy hydrocarbon, alcohol and acid in unstripped gas, carbon dioxide, water, mercury, and feed gas composition is separated into liquefied natural gas, hydrogen rich gas, rich CO gas, the utility value of unstripped gas is improved, there is higher economic benefit.
Description
Technical field
The present invention relates to waste gas recovery using field, Fischer-Tropsch process exhaust preparing liquefied natural gas is utilized more particularly to a kind of
Technique and system.
Background technology
F- T synthesis technology is the key technology in indirect coal liquefaction technique, and key reaction is CO and H2Reaction generation
Hydrocarbon has gaseous products, liquid product and solid product in the product of generation.The purpose of F- T synthesis is to turn coal
It changes gasoline, diesel oil, kerosene, fuel oil, liquefied petroleum gas and other products into, mainly includes coal gasification, synthesis gas transformation/net
The technical process such as change, F- T synthesis and Fischer-Tropsch synthetic upgrading.
Can generate some gaseous state tail gas products in Fischer-Tropsch synthesis, main component include methane, hydrogen, carbon monoxide,
Nitrogen and some hydrocarbon products further include a small amount of alcohols and acids product, and many ingredients are can to carry out in gaseous product
Recycling purification, Fischer-Tropsch process exhaust direct emission such as can be increased into greenhouse effects, environment is polluted, bring significant wastage.
Invention content
Being closed using Fischer-Tropsch for Fischer-Tropsch process exhaust can be made full use of the technical problem to be solved in the present invention is to provide a kind of
Into the technique and system of tail gas preparing liquefied natural gas.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, including：
For Fischer-Tropsch process exhaust to be made tentatively to cool down, and the first cooler of liquid water and heavy hydrocarbon is isolated, closed with Fischer-Tropsch
It is connected into tail gas air source by pipeline；
For the Fischer-Tropsch process exhaust tentatively to cool down to be made to cool down again, and it is further separated out the second of liquid water and heavy hydrocarbon
Cooler is connect with the first cooler by pipeline；
For carrying out heavy hydrocarbon washing to the Fischer-Tropsch process exhaust after cooling down again, Fischer-Tropsch process exhaust is made to remove C5 and C5
+ heavy hydrocarbon scrubbing tower, connect with the second cooler by pipeline；
It washes for the Fischer-Tropsch process exhaust after being washed to heavy hydrocarbon, makes Fischer-Tropsch process exhaust removing organic acid and alcohol
Water scrubber is connect with heavy hydrocarbon scrubbing tower by pipeline；
For carrying out carbonization treatment to the Fischer-Tropsch process exhaust after washing, make the suction of Fischer-Tropsch process exhaust carbon dioxide removal
It receives tower and regenerator, absorption tower is connect with water scrubber by pipeline, regenerator is connect with absorption tower by pipeline；
For to the withering molecular sieve drying device of Fischer-Tropsch process exhaust after carbonization treatment, leading to absorption tower
Piping connects；
For the sulfur loading active carbon bed handled the Fischer-Tropsch process exhaust demercuration after drying process, with molecular sieve drying device
It is connected by pipeline；
For carrying out liquefaction separation to demercuration treated Fischer-Tropsch process exhaust, make Fischer-Tropsch process exhaust isolate mixed hydrocarbon,
Hydrogen rich gas, rich CO gas, liquefied natural gas liquefaction separation device, the liquefaction separation device and sulfur loading active carbon bed
It is connected by pipeline.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, the mixed hydrocarbon of liquefaction separation device goes out
Mouth is connect with the detergent entrance of heavy hydrocarbon scrubbing tower by return line.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, the liquefaction separation device includes：
For carrying out the first-class heat exchanger of preliminary cooling treatment to demercuration treated Fischer-Tropsch process exhaust, with carrying sulphur activity
Charcoal bed is connected by pipeline；
For the Fischer-Tropsch process exhaust after preliminary cooling treatment to be made to isolate the liquefied petroleum gas rectifying column of mixed hydrocarbon, with level-one
Heat exchanger is connected by pipeline, and the mixed hydrocarbon outlet of liquefied petroleum gas rectifying column and the detergent entrance of heavy hydrocarbon scrubbing tower pass through reflux
Pipeline connects；
For carrying out the secondary heat exchanger of cooling treatment again to isolating the Fischer-Tropsch process exhaust after mixed hydrocarbon, with the stone that liquefies
Oil gas rectifying column is connected by pipeline；
For the Fischer-Tropsch process exhaust after cooling treatment again to be made to isolate the dehydrogenation tower of hydrogen rich gas, lead to secondary heat exchanger
Piping connects；
For making to isolate the first that the Fischer-Tropsch process exhaust after hydrogen rich gas isolates rich CO gas, liquefied natural gas
Alkane tower is connect with dehydrogenation tower by pipeline.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, the liquefaction separation device also wraps
It includes to provide the nitrogen refrigeration system of cold of liquefaction separation and azeotrope refrigeration system.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, the hydrogen rich gas at the top of dehydrogenation tower
Outlet is connected with hydrogen rich gas discharge pipe, and hydrogen rich gas discharge pipe is successively by secondary heat exchanger, first-class heat exchanger, so that hydrogen rich gas is arranged
Hydrogen rich gas in outlet pipe is cooled by secondary heat exchanger and first-class heat exchanger, the rich carbon monoxide gas at the top of methane tower
Body is exported to be connected with rich CO gas discharge pipe, and rich CO gas discharge pipe is successively by secondary heat exchanger, level-one
Heat exchanger, so that the rich CO gas in rich CO gas discharge pipe passes through secondary heat exchanger and first-class heat exchanger
It cools.
The technique using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, including：
Step 1: Fischer-Tropsch process exhaust is made tentatively to cool down, and isolate liquid water and heavy hydrocarbon；
Step 2: the Fischer-Tropsch process exhaust tentatively to cool down is made to cool down again, and it is further separated out liquid water and heavy hydrocarbon；
Step 3: to after cooling down again Fischer-Tropsch process exhaust carry out heavy hydrocarbon washing, make Fischer-Tropsch process exhaust removing C5 with
And C5+；
Step 4: to heavy hydrocarbon wash after Fischer-Tropsch process exhaust wash, make Fischer-Tropsch process exhaust removing organic acid and
Alcohol；
Step 5: carrying out carbonization treatment to the Fischer-Tropsch process exhaust after washing, make Fischer-Tropsch process exhaust carbon dioxide removal；
Step 6: processing is dried to the Fischer-Tropsch process exhaust after carbonization treatment；
Step 7: demercuration processing is carried out to the Fischer-Tropsch process exhaust after drying process；
Step 8: carrying out liquefaction separation to demercuration treated Fischer-Tropsch process exhaust, isolate Fischer-Tropsch process exhaust mixed
Hydrocarbon, hydrogen rich gas, rich CO gas, liquefied natural gas.
The technique using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, it further includes：Liquefaction separation is obtained
Mixed hydrocarbon import for after cooling down again Fischer-Tropsch process exhaust carry out heavy hydrocarbon washing, make Fischer-Tropsch process exhaust removing C5 and
The heavy hydrocarbon scrubbing tower of C5+ is as detergent.
The technique using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, it is described that demercuration, treated takes
Synthesis tail gas is ask to carry out liquefaction separation, Fischer-Tropsch process exhaust is made to isolate mixed hydrocarbon, hydrogen rich gas, rich CO gas, liquefaction day
Right gas bag includes：
Preliminary cooling treatment is carried out to demercuration treated Fischer-Tropsch process exhaust；
The Fischer-Tropsch process exhaust after preliminary cooling treatment is made to isolate mixed hydrocarbon；
Cooling treatment is carried out again to isolating the Fischer-Tropsch process exhaust after mixed hydrocarbon；
The Fischer-Tropsch process exhaust after cooling treatment again is made to isolate hydrogen rich gas；
Make to isolate the Fischer-Tropsch process exhaust after hydrogen rich gas and isolate rich CO gas, liquefied natural gas.
Technical scheme of the present invention can adequately remove heavy hydrocarbon, alcohol and acid in unstripped gas, carbon dioxide, water, mercury etc.
Feed gas composition by liquefaction separation device, is separated into liquefied natural gas, hydrogen rich gas, rich CO gas by impurity.This hair
Bright technical solution can ensure the operation of liquefaction separation safe and stable arrangement, while tail gas separation is into liquefied natural gas, hydrogen-rich
Gas, rich CO gas, improve the utility value of unstripped gas, have higher economic benefit.
Description of the drawings
Fig. 1 is the structure diagram of the system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention；
Fig. 2 is the structure diagram of liquefaction separation device.
Specific embodiment
As shown in Figure 1 and Figure 2, the system of the invention using Fischer-Tropsch process exhaust preparing liquefied natural gas, including：
For Fischer-Tropsch process exhaust to be made tentatively to cool down, and the first cooler 1 of liquid water and heavy hydrocarbon is isolated, closed with Fischer-Tropsch
It is connected into tail gas air source by pipeline；
For the Fischer-Tropsch process exhaust tentatively to cool down to be made to cool down again, and it is further separated out the second of liquid water and heavy hydrocarbon
Cooler 2 is connect with the first cooler 1 by pipeline；
For carrying out heavy hydrocarbon washing to the Fischer-Tropsch process exhaust after cooling down again, Fischer-Tropsch process exhaust is made to remove C5 and C5
+ heavy hydrocarbon scrubbing tower 3, connect with the second cooler by pipeline；
It washes for the Fischer-Tropsch process exhaust after being washed to heavy hydrocarbon, makes Fischer-Tropsch process exhaust removing organic acid and alcohol
Water scrubber 4 is connect with heavy hydrocarbon scrubbing tower by pipeline；
For carrying out carbonization treatment to the Fischer-Tropsch process exhaust after washing, make the suction of Fischer-Tropsch process exhaust carbon dioxide removal
It receives tower 5 and regenerator, absorption tower 5 is connect with water scrubber 4 by pipeline, regenerator is connect with absorption tower 5 by pipeline；
For to the withering molecular sieve drying device 6 of Fischer-Tropsch process exhaust after carbonization treatment, with absorption tower
It is connected by pipeline；
For the sulfur loading active carbon bed 7 handled the Fischer-Tropsch process exhaust demercuration after drying process, dry and fill with molecular sieve
6 are put to connect by pipeline；
For carrying out liquefaction separation to demercuration treated Fischer-Tropsch process exhaust, make Fischer-Tropsch process exhaust isolate mixed hydrocarbon,
Hydrogen rich gas, rich CO gas, liquefied natural gas liquefaction separation device 8, liquefaction separation device 8 and sulfur loading active carbon bed 7
It is connected by pipeline.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, the mixed hydrocarbon of liquefaction separation device goes out
Mouth is connect with the detergent entrance of heavy hydrocarbon scrubbing tower by return line.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, liquefaction separation device includes：
For carrying out the first-class heat exchanger of preliminary cooling treatment to demercuration treated Fischer-Tropsch process exhaust, with carrying sulphur activity
Charcoal bed is connected by pipeline；
For the Fischer-Tropsch process exhaust after preliminary cooling treatment to be made to isolate the liquefied petroleum gas rectifying column of mixed hydrocarbon, with level-one
Heat exchanger is connected by pipeline, and the mixed hydrocarbon outlet of liquefied petroleum gas rectifying column and the detergent entrance of heavy hydrocarbon scrubbing tower pass through reflux
Pipeline connects；
For carrying out the secondary heat exchanger of cooling treatment again to isolating the Fischer-Tropsch process exhaust after mixed hydrocarbon, with the stone that liquefies
Oil gas rectifying column is connected by pipeline；
For the Fischer-Tropsch process exhaust after cooling treatment again to be made to isolate the dehydrogenation tower of hydrogen rich gas, lead to secondary heat exchanger
Piping connects；
For making to isolate the first that the Fischer-Tropsch process exhaust after hydrogen rich gas isolates rich CO gas, liquefied natural gas
Alkane tower is connect with dehydrogenation tower by pipeline.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, liquefaction separation device further includes use
In the offer nitrogen refrigeration system of cold of liquefaction separation and azeotrope refrigeration system.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, the hydrogen rich gas at the top of dehydrogenation tower
Outlet is connected with hydrogen rich gas discharge pipe, and hydrogen rich gas discharge pipe is successively by secondary heat exchanger, first-class heat exchanger, so that hydrogen rich gas is arranged
Hydrogen rich gas in outlet pipe is cooled by secondary heat exchanger and first-class heat exchanger, the rich carbon monoxide gas at the top of methane tower
Body is exported to be connected with rich CO gas discharge pipe, and rich CO gas discharge pipe is successively by secondary heat exchanger, level-one
Heat exchanger, so that the rich CO gas in rich CO gas discharge pipe passes through secondary heat exchanger and first-class heat exchanger
It cools.
The technique using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, including：
Step 1: Fischer-Tropsch process exhaust is made tentatively to cool down, and isolate liquid water and heavy hydrocarbon；
Step 2: the Fischer-Tropsch process exhaust tentatively to cool down is made to cool down again, and it is further separated out liquid water and heavy hydrocarbon；
Step 3: to after cooling down again Fischer-Tropsch process exhaust carry out heavy hydrocarbon washing, make Fischer-Tropsch process exhaust removing C5 with
And C5+；
Step 4: to heavy hydrocarbon wash after Fischer-Tropsch process exhaust wash, make Fischer-Tropsch process exhaust removing organic acid and
Alcohol；
Step 5: carrying out carbonization treatment to the Fischer-Tropsch process exhaust after washing, make Fischer-Tropsch process exhaust carbon dioxide removal；
Step 6: processing is dried to the Fischer-Tropsch process exhaust after carbonization treatment；
Step 7: demercuration processing is carried out to the Fischer-Tropsch process exhaust after drying process；
Step 8: carrying out liquefaction separation to demercuration treated Fischer-Tropsch process exhaust, isolate Fischer-Tropsch process exhaust mixed
Hydrocarbon, hydrogen rich gas, rich CO gas, liquefied natural gas.
The technique using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, it further includes：Liquefaction separation is obtained
Mixed hydrocarbon import for after cooling down again Fischer-Tropsch process exhaust carry out heavy hydrocarbon washing, make Fischer-Tropsch process exhaust removing C5 and
The heavy hydrocarbon scrubbing tower of C5+ is as detergent.
The technique using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, demercuration treated Fischer-Tropsch is closed
Liquefaction separation is carried out into tail gas, Fischer-Tropsch process exhaust is made to isolate mixed hydrocarbon, hydrogen rich gas, rich CO gas, liquefied natural gas
Including：
Preliminary cooling treatment is carried out to demercuration treated Fischer-Tropsch process exhaust；
The Fischer-Tropsch process exhaust after preliminary cooling treatment is made to isolate mixed hydrocarbon；
Cooling treatment is carried out again to isolating the Fischer-Tropsch process exhaust after mixed hydrocarbon；
The Fischer-Tropsch process exhaust after cooling treatment again is made to isolate hydrogen rich gas；
Make to isolate the Fischer-Tropsch process exhaust after hydrogen rich gas and isolate rich CO gas, liquefied natural gas.
Technical scheme of the present invention can adequately remove heavy hydrocarbon, alcohol and acid in unstripped gas, carbon dioxide, water, mercury etc.
Feed gas composition by liquefaction separation device, is separated into liquefied natural gas, hydrogen rich gas, rich CO gas by impurity.
Technical scheme of the present invention can ensure the operation of liquefaction separation safe and stable arrangement, while Fischer-Tropsch process exhaust point
From into liquefied natural gas, hydrogen rich gas, rich CO gas, the utility value of unstripped gas is improved, there is higher economic effect
Benefit.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, the first cooler can be water cooling
Device or air cooler.
The system using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention, wherein, the second cooler is freon system
Cold or lithium bromide precooling machine or the refrigeration machine of his type.
Unstripped gas enters from the bottom of towe of heavy hydrocarbon scrubbing tower, goes out from tower top, and detergent is sprayed into from tower top in tower, is gone out from bottom of towe,
The C5 and C5+ in unstripped gas (Fischer-Tropsch process exhaust) are fallen in removing after heavy hydrocarbon washs, and are less than the content of C5 and C5+
1ppm。
Detergent is mixed hydrocarbon in liquefaction separation process, system drive initial stage using pentane, amylene, butane, butylene,
The mixture of one or several kinds of compositions in propane, propylene is as detergent.
Washing step uses water scrubber, and unstripped gas enters water scrubber from bottom of towe, goes out from tower top, and desalted water sprays into tower from tower top
It is interior, go out from bottom of towe, remove the organic acid and alcohol in unstripped gas after washing, the content of acid and alcohol is made to be less than 0.5ppm.
Unstripped gas enters decarbonization process after washing step, removes the carbon dioxide in unstripped gas, contains carbon dioxide
Amount is less than 50ppm, and decarbonization process uses MDEA decarburizations, and MDEA decarburizations use an absorption tower and a regenerator.
Unstripped gas enters drying process after decarbonization process, and drying process uses molecular sieve drying process, makes water dew point
Less than -65 DEG C.
Unstripped gas enters demercuration process after drying process, and demercuration uses sulfur loading active carbon, and mercury content is made to be less than 10ng/
m3。
Unstripped gas enters liquefaction separation process after demercuration process, and liquefaction separation process is mainly by liquefied petroleum gas rectifying
Tower, dehydrogenation tower, methane tower and heat exchanger, separator composition, mixed hydrocarbon, tower top are isolated in the bottom of towe of liquefied petroleum gas rectifying column
Unstripped gas after cooling enter dehydrogenation tower, isolate hydrogen rich gas from tower top, bottom liquid product enters methane tower, in methane tower
Tower top isolate rich CO gas, bottom of towe isolates liquefied natural gas.
Embodiment using the system job using Fischer-Tropsch process exhaust preparing liquefied natural gas of the present invention is as follows：
Temperature 60 C, pressure 31bar, flow 23000Nm3The Fischer-Tropsch process exhaust of/h, is cooled to by water-cooling process
40 DEG C, and part water and heavy hydrocarbon are isolated, subsequently into pre- cooling working procedure, further the temperature of tail gas is reduced, is again separate out
Part water and heavy hydrocarbon, into heavy hydrocarbon washing procedure, in heavy hydrocarbon washing procedure, tail gas passes through the mixed hydrocarbon from liquefaction separation process
After washing, the content of C5 and C5+ components is down to 1ppm, and hereinafter, device is driven, initial stage is washed using isopentane, after taking off heavy hydrocarbon
Fischer-Tropsch process exhaust enter washing process, the content of acid and alcohol is down to 0.5ppm hereinafter, subsequently into de- by removing acid and alcohol
Carbon dioxide content in tail gas is down to 50ppm hereinafter, subsequently into drying process by carbon technique, will be in Fischer-Tropsch process exhaust
Water dew point be reduced to -65 DEG C, and mercury content is down to 10ng/Nm by demercuration process3, liquefying separation process is finally entered,
Liquefying separation process is provided the cold of liquefaction separation, purified tail gas warp by nitrogen refrigeration system and azeotrope refrigeration system
It crosses and enters liquefied petroleum gas rectifying column after first-class heat exchanger cools, isolated in the bottom of towe of liquefied petroleum gas rectifying column mixed
Hydrocarbon isolates the tail gas of light component in tower top, and tail gas enters dehydrogenation tower after secondary heat exchanger further cools down, in dehydrogenation tower
Tower top isolates hydrogen rich gas, enters methane tower in the liquid-phase product that bottom of towe is isolated, and liquefaction day is isolated in the bottom of towe of methane tower
Right gas isolates rich CO gas in tower top, is finally completed the purification of Fischer-Tropsch process exhaust and liquefaction separation process.
It the above is only the preferred embodiment of the present invention, it is noted that those skilled in the art are come
It says, without departing from the principle of the present invention, several improvements and modifications can also be made, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (8)
1. a kind of system using Fischer-Tropsch process exhaust preparing liquefied natural gas, which is characterized in that including：
For Fischer-Tropsch process exhaust to be made tentatively to cool down, and the first cooler of liquid water and heavy hydrocarbon is isolated, with F- T synthesis tail
Gas air source is connected by pipeline；
For the Fischer-Tropsch process exhaust tentatively to cool down to be made to cool down again, and it is further separated out the second cooling of liquid water and heavy hydrocarbon
Device is connect with the first cooler by pipeline；
For carrying out heavy hydrocarbon washing to the Fischer-Tropsch process exhaust after cooling down again, make Fischer-Tropsch process exhaust removing C5's and C5+
Heavy hydrocarbon scrubbing tower is connect with the second cooler by pipeline；
It is washed for the Fischer-Tropsch process exhaust after being washed to heavy hydrocarbon, makes the washing of Fischer-Tropsch process exhaust removing organic acid and alcohol
Tower is connect with heavy hydrocarbon scrubbing tower by pipeline；
For carrying out carbonization treatment to the Fischer-Tropsch process exhaust after washing, make the absorption tower of Fischer-Tropsch process exhaust carbon dioxide removal
With regenerator, absorption tower is connect with water scrubber by pipeline, and regenerator is connect with absorption tower by pipeline；
For to the withering molecular sieve drying device of Fischer-Tropsch process exhaust after carbonization treatment, passing through pipe with absorption tower
Road connects；
For the sulfur loading active carbon bed handled the Fischer-Tropsch process exhaust demercuration after drying process, pass through with molecular sieve drying device
Pipeline connects；
For carrying out liquefaction separation to demercuration treated Fischer-Tropsch process exhaust, Fischer-Tropsch process exhaust is made to isolate mixed hydrocarbon, hydrogen-rich
Gas, rich CO gas, liquefied natural gas liquefaction separation device, the liquefaction separation device passes through with sulfur loading active carbon bed
Pipeline connects.
2. the system of Fischer-Tropsch process exhaust preparing liquefied natural gas is utilized as described in claim 1, which is characterized in that liquefaction separation
The mixed hydrocarbon outlet of device is connect with the detergent entrance of heavy hydrocarbon scrubbing tower by return line.
3. the system of Fischer-Tropsch process exhaust preparing liquefied natural gas is utilized as claimed in claim 2, which is characterized in that the liquefaction
Separator includes：
For carrying out the first-class heat exchanger of preliminary cooling treatment to demercuration treated Fischer-Tropsch process exhaust, with sulfur loading active carbon bed
It is connected by pipeline；
For the Fischer-Tropsch process exhaust after preliminary cooling treatment to be made to isolate the liquefied petroleum gas rectifying column of mixed hydrocarbon, exchange heat with level-one
Device is connected by pipeline, and the mixed hydrocarbon outlet of liquefied petroleum gas rectifying column and the detergent entrance of heavy hydrocarbon scrubbing tower pass through return line
Connection；
For carrying out the secondary heat exchanger of cooling treatment again to isolating the Fischer-Tropsch process exhaust after mixed hydrocarbon, with liquefied petroleum gas
Rectifying column is connected by pipeline；
For the Fischer-Tropsch process exhaust after cooling treatment again to be made to isolate the dehydrogenation tower of hydrogen rich gas, pass through pipe with secondary heat exchanger
Road connects；
For making to isolate the methane that the Fischer-Tropsch process exhaust after hydrogen rich gas isolates rich CO gas, liquefied natural gas
Tower is connect with dehydrogenation tower by pipeline.
4. the system of Fischer-Tropsch process exhaust preparing liquefied natural gas is utilized as claimed in claim 3, which is characterized in that the liquefaction
Separator further includes to provide the nitrogen refrigeration system of cold of liquefaction separation and azeotrope refrigeration system.
5. the system of Fischer-Tropsch process exhaust preparing liquefied natural gas is utilized as claimed in claim 4, which is characterized in that dehydrogenation tower
The hydrogen rich gas outlet at top is connected with hydrogen rich gas discharge pipe, and hydrogen rich gas discharge pipe passes through secondary heat exchanger, first-class heat exchanger successively,
So that the hydrogen rich gas in hydrogen rich gas discharge pipe is cooled by secondary heat exchanger and first-class heat exchanger, the top of methane tower
Rich CO gas outlet is connected with rich CO gas discharge pipe, and rich CO gas discharge pipe passes through two level successively
Heat exchanger, first-class heat exchanger so that rich CO gas in rich CO gas discharge pipe by secondary heat exchanger with
And first-class heat exchanger cools.
6. a kind of technique using Fischer-Tropsch process exhaust preparing liquefied natural gas, which is characterized in that including：
Step 1: Fischer-Tropsch process exhaust is made tentatively to cool down, and isolate liquid water and heavy hydrocarbon；
Step 2: the Fischer-Tropsch process exhaust tentatively to cool down is made to cool down again, and it is further separated out liquid water and heavy hydrocarbon；
Step 3: carrying out heavy hydrocarbon washing to the Fischer-Tropsch process exhaust after cooling down again, Fischer-Tropsch process exhaust is made to remove C5 and C5
+；
Step 4: the Fischer-Tropsch process exhaust after being washed to heavy hydrocarbon is washed, make Fischer-Tropsch process exhaust removing organic acid and alcohol；
Step 5: carrying out carbonization treatment to the Fischer-Tropsch process exhaust after washing, make Fischer-Tropsch process exhaust carbon dioxide removal；
Step 6: processing is dried to the Fischer-Tropsch process exhaust after carbonization treatment；
Step 7: demercuration processing is carried out to the Fischer-Tropsch process exhaust after drying process；
Step 8: carrying out liquefaction separation to demercuration treated Fischer-Tropsch process exhaust, Fischer-Tropsch process exhaust is made to isolate mixed hydrocarbon, richness
Hydrogen, rich CO gas, liquefied natural gas.
7. the technique of Fischer-Tropsch process exhaust preparing liquefied natural gas is utilized as claimed in claim 6, which is characterized in that further include：
The mixed hydrocarbon that liquefaction separation is obtained is imported for carrying out heavy hydrocarbon washing to the Fischer-Tropsch process exhaust after cooling down again, makes F- T synthesis
The heavy hydrocarbon scrubbing tower of tail gas removing C5 and C5+ is as detergent.
8. the technique of Fischer-Tropsch process exhaust preparing liquefied natural gas is utilized as claimed in claim 7, which is characterized in that described pair de-
Mercury treated Fischer-Tropsch process exhaust carries out liquefaction separation, and Fischer-Tropsch process exhaust is made to isolate mixed hydrocarbon, hydrogen rich gas, rich carbon monoxide
Gas, liquefied natural gas include：
Preliminary cooling treatment is carried out to demercuration treated Fischer-Tropsch process exhaust；
The Fischer-Tropsch process exhaust after preliminary cooling treatment is made to isolate mixed hydrocarbon；
Cooling treatment is carried out again to isolating the Fischer-Tropsch process exhaust after mixed hydrocarbon；
The Fischer-Tropsch process exhaust after cooling treatment again is made to isolate hydrogen rich gas；
Make to isolate the Fischer-Tropsch process exhaust after hydrogen rich gas and isolate rich CO gas, liquefied natural gas.
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| CN106938170B (en) * | 2017-03-31 | 2023-02-28 | 武汉金中石化工程有限公司 | Treatment device and treatment method for Fischer-Tropsch synthesis purge gas of cobalt-based fixed bed |
| CN108384594B (en) * | 2018-05-02 | 2023-10-17 | 中科瑞奥能源科技股份有限公司 | Process and device for purifying Fischer-Tropsch synthesis tail gas and recovering light hydrocarbon |
| CN109111336B (en) * | 2018-09-28 | 2024-04-05 | 北京恒泰洁能科技有限公司 | Deep cooling recovery device and process for waste towed synthetic tail gas |
| CN113975939A (en) * | 2020-07-27 | 2022-01-28 | 山西潞安煤基清洁能源有限责任公司 | Decarbonization method of Fischer-Tropsch synthesis tail gas |
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