CN106938170A - A kind of processing unit and processing method of cobalt-based fixed bed F- T synthesis off-gas - Google Patents
A kind of processing unit and processing method of cobalt-based fixed bed F- T synthesis off-gas Download PDFInfo
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- CN106938170A CN106938170A CN201710208632.0A CN201710208632A CN106938170A CN 106938170 A CN106938170 A CN 106938170A CN 201710208632 A CN201710208632 A CN 201710208632A CN 106938170 A CN106938170 A CN 106938170A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/08—Separating gaseous impurities from gases or gaseous mixtures or from liquefied gases or liquefied gaseous mixtures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/108—Hydrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
Abstract
The present invention relates to F- T synthesis field, the specifically related to a kind of processing unit and processing method of cobalt-based fixed bed F- T synthesis off-gas, processing unit includes off-gas fractional condensing unit, LPG scrubbing towers, water scrubber and cryogenic separation cold washing tower, the processing method of use above processing unit includes classification precooling, LPG washings, water washing and cryogenic separation step, it is simple in construction, it is safe and reliable, the active principle of cobalt-based fixed bed F- T synthesis off-gas is efficiently separated out, the economic benefit of cobalt-based fixed bed F- T synthesis is improved.
Description
Technical field
The present invention relates to F- T synthesis field, and in particular to a kind of processing unit of cobalt-based fixed bed F- T synthesis off-gas
And processing method.
Background technology
Cobalt-based fixed bed F- T synthesis is one of ICL for Indirect Coal Liquefaction technology, and it refers to synthesis gas (CO and H2) exist for raw material
The technical process of paraffin hydrocarbon is synthesized under the conditions of catalyst and appropriate reaction.Fischer-Tropsch tailgas disposing is always the important of F- T synthesis
Part, all has a certain impact to environmental protection and factory economy benefit.
The active principle of co-based fischer-tropsch off-gas has CO, H2、LPG（Liquefied Petroleum Gas abbreviation, liquid
Liquefied oil gas, key component is propane and butane, there is a small amount of propylene and butylene）And LNG（liquefied natural gas
Abbreviation, liquefied natural gas, main component is methane CH4）, impurity gas component has carbon dioxide, nitrogen, organic acid, alcohol, alkene
Hydrocarbon etc..
The processing of current iron-based or cobalt-based syrup state bed Fischer Tropsch off-gas is more ripe, and main process route has：Steam turns
Change+carbon monodixe conversion+PSA puies forward hydrogen method, and (Pressure Swing Adsorption abbreviation, pressure-variable adsorption carries hydrogen, according to suction
Attached dose of selectively removing foreign gas at various pressures to gas, obtains high-purity hydrogen)；Alkaline process decarburization+oil wash+part
Circulation/part PSA carries hydrogen etc..
But cobalt-based fixed bed F- T synthesis is paraffin wax product, the off-gas that device is emitted and slurry bed system difference compared with
Greatly, methane content is higher, and carbon dioxide content is relatively low, containing acid, containing fusel, heavy hydrocarbon wider distribution, and following process device hydrogen
Gas demand is few.There are many problems, such as alkaline process decarburization if using the process route of syrup state bed Fischer Tropsch tailgas disposing
Inapplicable to cobalt-based fixed bed Fischer-Tropsch off-gas, steam reformer investment is high, energy consumption is big, is also one to byproduct methane resource
Plant and waste.The cobalt-based fixed bed Fischer Tropsch Facility having been carried out both at home and abroad is less, most of device to discharge tolerance smaller, do not return
Effective gas component is received, but is used directly as fuel gas.
In consideration of it, overcoming above defect of the prior art, there is provided a kind of place of cobalt-based fixed bed F- T synthesis off-gas
Managing device and processing method turns into this area technical problem urgently to be resolved hurrily.
The content of the invention
It is an object of the invention to the shortcoming for overcoming prior art, there is provided a kind of cobalt-based fixed bed F- T synthesis off-gas
Processing unit and processing method, reclaim effective product in cobalt-based fixed bed F- T synthesis off-gas, it is to avoid the wasting of resources and
Environmental pollution, safe and reliable, economical rationality.
The purpose of the present invention can be realized by following technical measures：
A kind of processing unit of cobalt-based fixed bed F- T synthesis off-gas, it is located at F- T synthesis device and Fischer-Tropsch water treatment facilities
Between, it is characterised in that it includes
Off-gas fractional condensing unit, the off-gas fractional condensing unit includes one-level cooling device, the one-level being sequentially communicated
Divide flow container, two grades of cooling devices and two fraction flow containers, the relaxation of the one-level cooling device air inlet and the F- T synthesis device
Deflation outlet is connected, and the fraction flow container and the two fractions flow container are respectively arranged with the first heavy hydrocarbon outlet and the second weight
Hydrocarbon outlet；
LPG scrubbing towers, the LPG scrubbing towers top is provided with LPG input ports and LPG scrubbing tower exhaust outlets, the LPG scrubbing towers
Bottom is provided with LPG scrubbing towers air inlet and the 3rd heavy hydrocarbon outlet, the LPG scrubbing towers air inlet and the two fractions flow container
Gas outlet is connected；
Water scrubber, the water scrubber top is provided with washing gas outlet, and the water scrubber bottom is provided with water scrubber air inlet
With washings outlet, the water scrubber air inlet is connected with the LPG scrubbing towers exhaust outlet, the washings outlet connection
To the Fischer-Tropsch water treatment facilities；
With
Cold washing tower air inlet, tail gas row are provided with cryogenic separation cold washing tower, the cryogenic separation cold washing tower
Outlet, LNG outlets and LPG outlets, the washing of the cryogenic separation cold washing tower air inlet and the water scrubber
Gas outlet is connected.
By above technical scheme, wherein the water scrubber is provided with two sections filler.
By above technical scheme, wherein the first heavy hydrocarbon outlet, the second heavy hydrocarbon outlet and described triple
Hydrocarbon outlet is communicated to hydro-refining unit after converging.
By above technical scheme, wherein LPG scrubbing towers exhaust outlet is communicated to two grades of cooling devices, by described two grades
The heat exchange pipeline of cooling device, then it is communicated to the water scrubber air inlet.
By above technical scheme, wherein the LPG outlets of the cryogenic separation cold washing tower are communicated to the LPG
The LPG input ports of scrubbing tower.
A kind of processing method of cobalt-based fixed bed F- T synthesis off-gas, it is characterised in that：It comprises the following steps：
a）Cobalt-based fixed bed F- T synthesis off-gas is cooled to 35 ~ 45 DEG C, warp in advance by the recirculated water of the one-level cooling device
Isolated first heavy hydrocarbon of one fraction flow container and the first separation gas；
b）First separation gas is cooled to 3 ~ 7 DEG C by two grades of cooling devices heat exchange and refrigerant, through two fraction
Isolated second heavy hydrocarbon of flow container and the second separation gas；
c）Second separation gas is sent into LPG scrubbing towers by LPG scrubbing towers air inlet, LPG is washed by LPG input ports feeding LPG
Tower, the 3rd heavy hydrocarbon and the 3rd separation gas are obtained through the washing of LPG scrubbing towers；
d）By the 3rd separation gas heating to water scrubber is sent into after 25 ~ 35 DEG C, obtain washing gas by washing；
e）Washing pneumatic transmission is entered into cryogenic separation device cold washing tower, is washed by ice chest condensate liquid, isolates LPG, obtained
LNG, tail gas carries hydrogen by PSA.
By above technical scheme, wherein step d）By the way of two sections are washed, epimere washing is used at Fischer-Tropsch water
Manage device and handle qualified recycle-water and fresh water, hypomere washing is washed using bottom of towe part recirculation water, remaining bottom of towe water by described
Wash after water outlet is extracted out and send into the Fischer-Tropsch water treatment facilities.
By above technical scheme, wherein step a）, step b）With step c）In the first heavy hydrocarbon, the second heavy hydrocarbon and triple
Hydrocarbon is discharged and converged by the first heavy hydrocarbon outlet, the second heavy hydrocarbon outlet and the 3rd heavy hydrocarbon outlet respectively
After send into hydro-refining unit.
By above technical scheme, wherein step d）In, the 3rd separation gas is used and step b）In first separation gas change
The mode of heat is heated up.
By above technical scheme, wherein step e）The LPG isolated is by sending into step c after heating）In LPG washing
Tower, for the washing to the second separation gas.
The processing unit and processing method of a kind of cobalt-based fixed bed F- T synthesis off-gas of the present invention, simple in construction, peace
It is complete reliable, existing F- T synthesis device, cryogenic separation device and Fischer-Tropsch water treatment facilities are made full use of, cobalt is efficiently separated out
The active principle of base fixed bed F- T synthesis off-gas, improves the economic benefit of cobalt-based fixed bed F- T synthesis.
Brief description of the drawings
Fig. 1 is embodiment of the present invention structural representation.
Wherein：1- F- T synthesis devices, 101- off-gas outlets, 201- one-level cooling devices, 2011- one-levels cooling dress
Put air inlet, the fraction flow containers of 202- mono-, 2021- the first heavy hydrocarbon outlets, bis- grades of cooling devices of 203-, the fraction flow containers of 204- bis-,
2041- the second heavy hydrocarbon outlets, the fraction flow container gas outlets of 2042- bis-, 3-LPG scrubbing towers, 301-LPG input ports, 302-LPG is washed
Tower exhaust outlet is washed, 303-LPG scrubbing tower air inlets, the heavy hydrocarbon outlets of 304- the 3rd, 4- water scrubbers, 401- washes gas outlet,
402- water scrubber air inlets, 403- washings outlets, 5- cryogenic separation cold washing towers, 501- cold washing tower air inlets,
502- tail gas outlets, 503-LNG outlets, 504-LPG outlets, 6- Fischer-Tropsch water treatment facilities, 7- hydro-refining units.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and specific implementation
Example is described in further detail to the present invention.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
It is not intended to limit the present invention.
The composition of cobalt-based fixed bed Fischer-Tropsch off-gas is sufficiently complex, effective gas component have methane, carbon monoxide, hydrogen, C1 ~
C10 n-alkanes, impurity gas component has carbon dioxide, nitrogen, organic acid, alcohol, alkene etc..Wherein hydrogen and carbon monoxide volume
Fraction sum is more than 60%, and methane volumetric fraction, in order to fully reclaim effective gas, improves the economy of process units more than 25%,
Need to extract the effectively gas such as methane, hydrogen and carbon monoxide, relatively more rational technique is to produce LNG, tail gas by cryogenic separation
Hydrogen is carried by PSA again, but cryogenic separation device is required to unstripped gas, must not contain heavy hydrocarbon, acid and alcohol etc., heavy hydrocarbon can block deep cooling
The ice chest of separation, acid and alcohol can cause decarburizer to foam.
The processing unit and processing method for a kind of cobalt-based fixed bed F- T synthesis off-gas that the present invention is provided, by simple
Pretreatment can meet the requirement of follow-up cryogenic separation device, flow is simple, operation flexibly, save the energy.
Specifically, refer to shown in Fig. 1, a kind of processing unit of cobalt-based fixed bed F- T synthesis off-gas of the invention,
It is located between F- T synthesis device 1 and Fischer-Tropsch water treatment facilities 6, it include off-gas fractional condensing unit, LPG scrubbing towers 3,
Water scrubber 4 and cryogenic separation cold washing tower 5.
Wherein, off-gas fractional condensing unit includes one-level cooling device 201, the fraction flow container 202, two being sequentially communicated
The level fraction flow container 204 of cooling device 203 and two, the off-gas of one-level cooling device air inlet 2011 and F- T synthesis device is discharged
Mouth 101 is connected, and a fraction flow container 202 and two fraction flow containers 204 are respectively arranged with the first heavy hydrocarbon outlet 2021 and the second heavy hydrocarbon
Outlet 2041.
Wherein, the top of LPG scrubbing towers 3 is provided with LPG input ports 301 and LPG scrubbing towers exhaust outlet 302, and bottom is set
There are LPG scrubbing towers air inlet 303 and the 3rd heavy hydrocarbon outlet 304, LPG scrubbing towers air inlet 303 and two fraction flow container gas outlets
2042 connections.
Wherein, the top of water scrubber 4 is provided with washing gas outlet 401, and bottom is provided with water scrubber air inlet 402 and washed
Water outlet 403 is washed, water scrubber air inlet 402 is connected with LPG scrubbing towers exhaust outlet 302, and washings outlet 403 is communicated to expense
Hold in the palm water treatment facilities 6.
Wherein, cold washing tower air inlet 501, tail gas outlet 502, LNG are provided with cryogenic separation cold washing tower 5
Outlet 503 and LPG outlets 504, the washing gas outlet 401 of cryogenic separation cold washing tower air inlet 501 and water scrubber
Connection.
The embodiment of the present invention, which has been also correspondingly provided, carries out cobalt-based fixed bed F- T synthesis off-gas with above-mentioned processing unit
The method of processing, comprises the following steps：
a）Cobalt-based fixed bed F- T synthesis off-gas is cooled to 35 ~ 45 DEG C in advance by the recirculated water of one-level cooling device 201, through one
Isolated first heavy hydrocarbon of fraction flow container 202 and the first separation gas；
b）First separation gas is exchanged heat by two grades of cooling devices 203 and be cooled to 3 ~ 7 DEG C with refrigerant, through two fraction flow containers
204 isolated second heavy hydrocarbons and the second separation gas；
c）Second separation gas is sent into LPG scrubbing towers 3 by LPG scrubbing towers air inlet 303, LPG is sent into by LPG input ports 301
LPG scrubbing towers 3, the 3rd heavy hydrocarbon and the 3rd separation gas are obtained through the washing of LPG scrubbing towers 3；
d）By the 3rd separation gas heating to feeding water scrubber 4 after 25 ~ 35 DEG C, obtain washing gas by washing；
e）Washing pneumatic transmission is entered into cryogenic separation device cold washing tower 5, is washed by ice chest condensate liquid, isolates LPG, obtained
LNG, tail gas carries hydrogen by PSA.
Further, water scrubber 4 is provided with two sections filler, step d）By the way of two sections are washed, epimere
Washing handles qualified recycle-water and fresh water using Fischer-Tropsch water treatment facilities 6, and hypomere washing is remained using bottom of towe part recirculation water
Remaining bottom of towe water sends into Fischer-Tropsch water treatment facilities 6 after being extracted out by washings outlet 403, the modes of two sections of washings can be removed fully
Acid and fusel in 3rd separation gas, can reduce the water consume of water scrubber, high-efficiency environment friendly again.
Further, step a）, step b）With step c）In the first heavy hydrocarbon, the second heavy hydrocarbon and the 3rd heavy hydrocarbon pass through respectively
First heavy hydrocarbon outlet 2021, the second heavy hydrocarbon outlet 2041 and the 3rd heavy hydrocarbon outlet 304 send into hydrogenation after discharging and converging
Refining plant 7.
Further, LPG scrubbing towers exhaust outlet 302 is communicated to two grades of cooling devices 203, by two grades of cooling devices 203
Heat exchange pipeline, then be communicated to the water scrubber air inlet 402, step d）In, the 3rd separation gas enters two grades of cooling devices
203, with step b）In the first separation gas converting heat, so as to reach the effect of heating, without individually to the 3rd separation gas heating
With to the first separation gas cooling, the energy and the resources of production have greatly been saved.
Further, the LPG outlets 504 of cryogenic separation cold washing tower 5 are communicated to the LPG input ports of LPG scrubbing towers 3
301, step e）The LPG isolated is by sending into step c after heating）In LPG scrubbing towers 3, for the second separation gas
Washing, reaches the effect that LPG is recycled with this, simplifies production procedure, it is to avoid the wasting of resources.
Embodiment 1
The method that cobalt-based fixed bed F- T synthesis tailgas disposing is carried out using above-mentioned processing unit is present embodiments provided, specifically
Comprise the following steps：
S101, classification precooling：Cobalt-based fixed bed F- T synthesis off-gas is cooled in advance by the recirculated water of one-level cooling device 201
35 ~ 45 DEG C, through isolated first heavy hydrocarbon of a fraction flow container 202 and the first separation gas, the first separation gas is passed through two grades
Cooling device 203 exchanges heat and refrigerant is cooled to 3 ~ 7 DEG C, is separated through isolated second heavy hydrocarbon of two fraction flow container 204 and second
Gas.
S102, LPG are washed：Second separation gas is sent into LPG scrubbing towers 3 by LPG scrubbing towers air inlet 303, LPG by
The feeding LPG scrubbing towers of LPG input ports 301 3, the 3rd heavy hydrocarbon and the 3rd separation gas are obtained through the washing of LPG scrubbing towers 3.
S103, heavy hydrocarbon collection processing：First heavy hydrocarbon, the second heavy hydrocarbon and the 3rd heavy hydrocarbon pass through the first heavy hydrocarbon outlet respectively
2021st, hydro-refining unit 7 is sent into after the second heavy hydrocarbon outlet 2041 and the 3rd heavy hydrocarbon outlet 304 are discharged and converged.
S104, water washing：By the 3rd separation gas heating to sending into water scrubber 4 after 25 ~ 35 DEG C, by washing go deacidification and
Obtain washing gas after fusel, by the way of two sections are washed, epimere washing handles qualified using Fischer-Tropsch water treatment facilities 6
Recycle-water and fresh water, hypomere washing are extracted out using bottom of towe part recirculation water, remaining bottom of towe water by the washings outlet 403
After send into the Fischer-Tropsch water treatment facilities 6.
S105, cryogenic separation：Washing pneumatic transmission is entered into cryogenic separation device cold washing tower 5, washed by ice chest condensate liquid,
LPG is isolated, LNG is obtained, tail gas carries hydrogen by PSA, LPG is by sending into LPG scrubbing towers 3 after heating, for being separated to second
The washing of gas.
The advantage of the present embodiment processing method is:Check on, separate step by step step by step, classification precooling and LPG washings are thoroughly gone
Except the heavy hydrocarbon in off-gas；Washing removes the acid and fusel in off-gas, and using two sections of water-washing methods, removes more thorough,
More save water and energy；The LPG that cryogenic separation device cold washing tower is isolated sends the recycling of LPG scrubbing towers back to, energy-saving.
Package unit technique is simple, safe and reliable, saves the energy, has effectively reclaimed the gas componant with economic benefit.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, all essences in the present invention
Any modification, equivalent and improvement made within refreshing and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of processing unit of cobalt-based fixed bed F- T synthesis off-gas, it is located at F- T synthesis device and Fischer-Tropsch water process is filled
Between putting, it is characterised in that it includes
Off-gas fractional condensing unit, the off-gas fractional condensing unit includes one-level cooling device, the one-level being sequentially communicated
Divide flow container, two grades of cooling devices and two fraction flow containers, the relaxation of the one-level cooling device air inlet and the F- T synthesis device
Deflation outlet is connected, and the fraction flow container and the two fractions flow container are respectively arranged with the first heavy hydrocarbon outlet and the second weight
Hydrocarbon outlet；
LPG scrubbing towers, the LPG scrubbing towers top is provided with LPG input ports and LPG scrubbing tower exhaust outlets, the LPG scrubbing towers
Bottom is provided with LPG scrubbing towers air inlet and the 3rd heavy hydrocarbon outlet, the LPG scrubbing towers air inlet and the two fractions flow container
Gas outlet is connected；
Water scrubber, the water scrubber top is provided with washing gas outlet, and the water scrubber bottom is provided with water scrubber air inlet
With washings outlet, the water scrubber air inlet is connected with the LPG scrubbing towers exhaust outlet, the washings outlet connection
To the Fischer-Tropsch water treatment facilities；
With
Cold washing tower air inlet, tail gas row are provided with cryogenic separation cold washing tower, the cryogenic separation cold washing tower
Outlet, LNG outlets and LPG outlets, the washing of the cryogenic separation cold washing tower air inlet and the water scrubber
Gas outlet is connected.
2. the processing unit of a kind of cobalt-based fixed bed F- T synthesis off-gas according to claim 1, wherein the washing
Tower is provided with two sections filler.
3. the processing unit of a kind of cobalt-based fixed bed F- T synthesis off-gas according to claim 1, wherein described first
Heavy hydrocarbon outlet, the second heavy hydrocarbon outlet and the 3rd heavy hydrocarbon outlet are communicated to hydro-refining unit after converging.
4. a kind of processing unit of cobalt-based fixed bed F- T synthesis off-gas according to claim 1, wherein LPG scrubbing towers
Exhaust outlet is communicated to two grades of cooling devices, by the heat exchange pipeline of two grades of cooling devices, then is communicated to the washing
Tower air inlet.
5. the processing unit of a kind of cobalt-based fixed bed F- T synthesis off-gas according to claim 1, wherein the deep cooling
The LPG outlets of separation cold washing tower are communicated to the LPG input ports of the LPG scrubbing towers.
6. a kind of processing method of cobalt-based fixed bed F- T synthesis off-gas, it is characterised in that：It comprises the following steps：
a）Cobalt-based fixed bed F- T synthesis off-gas is cooled to 35 ~ 45 DEG C, warp in advance by the recirculated water of the one-level cooling device
Isolated first heavy hydrocarbon of one fraction flow container and the first separation gas；
b）First separation gas is cooled to 3 ~ 7 DEG C by two grades of cooling devices heat exchange and refrigerant, through two fraction
Isolated second heavy hydrocarbon of flow container and the second separation gas；
c）Second separation gas is sent into LPG scrubbing towers by LPG scrubbing towers air inlet, LPG is washed by LPG input ports feeding LPG
Tower, the 3rd heavy hydrocarbon and the 3rd separation gas are obtained through the washing of LPG scrubbing towers；
d）By the 3rd separation gas heating to water scrubber is sent into after 25 ~ 35 DEG C, obtain washing gas by washing；
e）Washing pneumatic transmission is entered into cryogenic separation device cold washing tower, is washed by ice chest condensate liquid, isolates LPG, obtained
LNG, tail gas carries hydrogen by PSA.
7. a kind of processing method of cobalt-based fixed bed F- T synthesis off-gas according to claim 6, wherein step d）Adopt
The mode washed with two sections, epimere washing handles qualified recycle-water and fresh water, hypomere using Fischer-Tropsch water treatment facilities
Washing is sent into the Fischer-Tropsch water process and filled using bottom of towe part recirculation water, remaining bottom of towe water after being extracted out by the washings outlet
Put.
8. a kind of processing method of cobalt-based fixed bed F- T synthesis off-gas according to claim 6, wherein step a）, step
Rapid b）With step c）In the first heavy hydrocarbon, the second heavy hydrocarbon and the 3rd heavy hydrocarbon pass through the first heavy hydrocarbon outlet, described respectively
Two heavy hydrocarbon outlets and the 3rd heavy hydrocarbon outlet are discharged and send into hydro-refining unit after converging.
9. a kind of processing method of cobalt-based fixed bed F- T synthesis off-gas according to claim 6, wherein step d）In,
3rd separation gas is used and step b）In first separation gas converting heat mode heated up.
10. a kind of processing method of cobalt-based fixed bed F- T synthesis off-gas according to claim 6, wherein step e）Point
The LPG separated out is by sending into step c after heating）In LPG scrubbing towers, for second separation gas washing.
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