CN106938170B - Treatment device and treatment method for Fischer-Tropsch synthesis purge gas of cobalt-based fixed bed - Google Patents
Treatment device and treatment method for Fischer-Tropsch synthesis purge gas of cobalt-based fixed bed Download PDFInfo
- Publication number
- CN106938170B CN106938170B CN201710208632.0A CN201710208632A CN106938170B CN 106938170 B CN106938170 B CN 106938170B CN 201710208632 A CN201710208632 A CN 201710208632A CN 106938170 B CN106938170 B CN 106938170B
- Authority
- CN
- China
- Prior art keywords
- gas
- lpg
- washing
- washing tower
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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 invention relates to the field of Fischer-Tropsch synthesis, in particular to a treatment device and a treatment method for cobalt-based fixed bed Fischer-Tropsch synthesis purge gas.
Description
Technical Field
The invention relates to the field of Fischer-Tropsch synthesis, in particular to a device and a method for treating Fischer-Tropsch synthesis purge gas of a cobalt-based fixed bed.
Background
The Fischer-Tropsch synthesis of a cobalt-based fixed bed is one of coal indirect liquefaction technologies, and means that synthesis gas (CO and H) 2 ) The process for synthesizing paraffin hydrocarbon by using raw material under the condition of catalyst and proper reaction condition. The Fischer-Tropsch purge gas treatment is always an important component of Fischer-Tropsch synthesis, and has certain influence on environmental protection and economic benefit of factories.
The effective components of the cobalt-based Fischer-Tropsch purge gas comprise CO and H 2 LPG (abbreviation for Liquefied Petroleum Gas, main component of propane and butane with small amounts of propylene and butene) and LNG (abbreviation for Liquefied Natural Gas, main component of methane CH 4 ) The impurity gas comprises carbon dioxide, nitrogen and organic acidAlcohols, olefins, and the like.
At present, the treatment of the Fischer-Tropsch purge gas of an iron-based or cobalt-based slurry bed is mature, and the main process routes comprise: steam reforming + carbon monoxide shift + PSA hydrogen extraction (abbreviation of Pressure Swing Adsorption hydrogen extraction, which removes impurity gases according to the selectivity of adsorbents to gases at different pressures to obtain high-purity hydrogen); alkaline decarburization + oil washing + partial recycle/partial PSA hydrogen extraction, etc.
However, the Fischer-Tropsch synthesis of the cobalt-based fixed bed is a paraffin product, the difference between purge gas discharged by the device and a slurry bed is large, the methane content is high, the carbon dioxide content is low, acid and fusel are contained, the heavy hydrocarbon distribution is wide, and the hydrogen demand of a subsequent processing device is very small. If a process route for treating Fischer-Tropsch purge gas of a slurry bed is adopted, a plurality of problems exist, such as inapplicability of alkaline decarburization to the Fischer-Tropsch purge gas of a cobalt-based fixed bed, high investment and high energy consumption of a steam conversion device, and waste of byproduct methane resources. The cobalt-based fixed bed Fischer-Tropsch device which is implemented at home and abroad is less, the purge gas amount of most devices is less, and the effective gas components are not recovered but directly used as fuel gas.
In view of the above, the technical problems to be solved in the art are to provide a device and a method for treating a cobalt-based fixed bed fischer-tropsch synthesis purge gas.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a treatment device and a treatment method for cobalt-based fixed bed Fischer-Tropsch synthesis purge gas, which are used for recovering effective products in the cobalt-based fixed bed Fischer-Tropsch synthesis purge gas, avoiding resource waste and environmental pollution, and are safe, reliable, economical and reasonable.
The object of the invention can be achieved by the following technical measures:
the treatment device for the Fischer-Tropsch synthesis purge gas of the cobalt-based fixed bed is positioned between a Fischer-Tropsch synthesis device and a Fischer-Tropsch water treatment device and is characterized by comprising
The device comprises a purge gas fractional condensation device, a first-stage cooling device, a first-stage liquid separation tank, a second-stage cooling device and a second-stage liquid separation tank, wherein the first-stage cooling device, the first-stage liquid separation tank, the second-stage liquid separation tank and the first-stage cooling device are sequentially communicated;
the upper part of the LPG washing tower is provided with an LPG input port and an LPG washing tower exhaust port, the lower part of the LPG washing tower is provided with an LPG washing tower air inlet and a third hydrocarbon discharge port, and the LPG washing tower air inlet is communicated with the secondary liquid separating tank air outlet;
the upper part of the washing tower is provided with a washing gas exhaust port, the lower part of the washing tower is provided with a washing tower gas inlet and a washing water exhaust port, the washing tower gas inlet is communicated with the LPG washing tower gas exhaust port, and the washing water exhaust port is communicated to the Fischer-Tropsch water treatment device;
and
cryogenic separation cryogenic scrubber, be provided with cryogenic scrubber air inlet, tail gas discharge port, LNG discharge port and LPG discharge port on the cryogenic separation cryogenic scrubber, cryogenic separation cryogenic scrubber air inlet with the scrubbing tower water scrubbing gas discharge port intercommunication.
According to the technical scheme, the washing tower is provided with an upper section of packing and a lower section of packing.
According to the technical scheme, the first heavy hydrocarbon discharge port, the second heavy hydrocarbon discharge port and the third heavy hydrocarbon discharge port are converged and then communicated to a hydrofining device.
According to the technical scheme, the exhaust port of the LPG washing tower is communicated to the secondary cooling device, passes through the heat exchange pipeline of the secondary cooling device and is communicated to the air inlet of the water washing tower.
According to the technical scheme, the LPG discharge port of the cryogenic separation low-temperature washing tower is communicated to the LPG input port of the LPG washing tower.
A treatment method of Fischer-Tropsch synthesis purge gas of a cobalt-based fixed bed is characterized by comprising the following steps: which comprises the following steps:
a) Precooling the Fischer-Tropsch synthesis purge gas of the cobalt-based fixed bed to 35-45 ℃ through circulating water of the primary cooling device, and separating by using the primary liquid separation tank to obtain first heavy hydrocarbon and first separated gas;
b) Exchanging heat of the first separated gas through the secondary cooling device, cooling the first separated gas to 3-7 ℃ through a refrigerant, and separating the first separated gas through the secondary liquid separation tank to obtain second heavy hydrocarbon and second separated gas;
c) Feeding the second separated gas into an LPG washing tower from an LPG washing tower gas inlet, feeding LPG into the LPG washing tower from an LPG input port, and washing the LPG washing tower to obtain third heavy hydrocarbon and third separated gas;
d) Heating the third separated gas to 25-35 ℃, sending the third separated gas into a water washing tower, and washing the third separated gas with water to obtain water washing gas;
e) And (3) feeding the washing gas into a cryogenic separation device low-temperature washing tower, washing by using condensate of a cold box, separating LPG (liquefied petroleum gas) to obtain LNG (liquefied natural gas), and extracting hydrogen from tail gas by using PSA (pressure swing adsorption).
According to the technical scheme, the step d) adopts an upper-section washing mode and a lower-section washing mode, qualified recycle water and fresh water are treated by the Fischer-Tropsch water treatment device in the upper-section washing mode, return water is distributed at the bottom of the tower in the lower-section washing mode, and residual tower bottom water is pumped out from the washing water discharge port and then is fed into the Fischer-Tropsch water treatment device.
According to the technical scheme, the first heavy hydrocarbon, the second heavy hydrocarbon and the third heavy hydrocarbon in the steps a), b) and c) are discharged and merged through the first heavy hydrocarbon discharge outlet, the second heavy hydrocarbon discharge outlet and the third heavy hydrocarbon discharge outlet respectively and then are sent to a hydrofining device.
According to the technical scheme, in the step d), the temperature of the third separation gas is raised in a heat exchange mode with the first separation gas in the step b).
According to the technical scheme, the LPG separated in the step e) is sent to the LPG washing tower in the step c) after being heated, and is used for washing the second separated gas.
The treatment device and the treatment method for the Fischer-Tropsch synthesis purge gas of the cobalt-based fixed bed are simple in structure, safe and reliable, the existing Fischer-Tropsch synthesis device, cryogenic separation device and Fischer-Tropsch water treatment device are fully utilized, effective components of the Fischer-Tropsch synthesis purge gas of the cobalt-based fixed bed are effectively separated, and the economic benefit of Fischer-Tropsch synthesis of the cobalt-based fixed bed is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Wherein: the system comprises a 1-Fischer-Tropsch synthesis device, a 101-purge gas discharge port, a 201-primary cooling device, a 2011-primary cooling device air inlet, a 202-primary liquid separation tank, a 2021-first heavy hydrocarbon discharge port, a 203-secondary cooling device, a 204-secondary liquid separation tank, a 2041-second heavy hydrocarbon discharge port, a 2042-secondary liquid separation tank air outlet, a 3-LPG washing tower, a 301-LPG input port, a 302-LPG washing tower air outlet, a 303-LPG washing tower air inlet, a 304-third heavy hydrocarbon discharge port, a 4-washing tower, a 401-water washing gas discharge port, a 402-water washing tower air inlet, a 403-washing water discharge port, a 5-cryogenic separation low-temperature washing tower, a 501-low-temperature washing tower air inlet, a 502-tail gas discharge port, a 503-LNG discharge port, a 504-LPG discharge port, a 6-water treatment device and a 7-hydrofining device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The Fischer-Tropsch purge gas of the cobalt-based fixed bed is quite complex in composition, effective gas components comprise methane, carbon monoxide, hydrogen and C1-C10 normal alkanes, and impurity gas components comprise carbon dioxide, nitrogen, organic acid, alcohol, olefin and the like. Wherein hydrogen and carbon monoxide volume fraction sum exceed 60%, methane volume fraction exceeds 25%, in order fully to retrieve the active gas, the economic nature of apparatus for producing is improved, need draw methane, active gas such as hydrogen and carbon monoxide, more reasonable technology is through cryogenic separation preparation LNG, tail gas is again through PSA hydrogen extraction, but cryogenic separation device has the requirement to the feed gas, must not contain heavy hydrocarbon, acid and alcohol etc, heavy hydrocarbon can block the cold box of cryogenic separation, acid and alcohol can cause the decarbonizer to foam.
The treatment device and the treatment method for the Fischer-Tropsch synthesis purge gas of the cobalt-based fixed bed can meet the requirements of a subsequent cryogenic separation device through simple pretreatment, and have the advantages of simple flow, flexible operation and energy conservation.
Specifically, referring to fig. 1, the treatment device for the cobalt-based fixed bed fischer-tropsch synthesis purge gas is located between a fischer-tropsch synthesis device 1 and a fischer-tropsch water treatment device 6, and comprises a purge gas fractional condensation device, an LPG washing tower 3, a water washing tower 4 and a cryogenic separation low-temperature washing tower 5.
The classified condensation device of the purge gas comprises a first-stage cooling device 201, a first-stage liquid separation tank 202, a second-stage cooling device 203 and a second-stage liquid separation tank 204 which are sequentially communicated, wherein a first-stage cooling device air inlet 2011 is communicated with a purge gas outlet 101 of the Fischer-Tropsch synthesis device, and the first-stage liquid separation tank 202 and the second-stage liquid separation tank 204 are respectively provided with a first heavy hydrocarbon outlet 2021 and a second heavy hydrocarbon outlet 2041.
An LPG input port 301 and an LPG washing tower exhaust port 302 are arranged at the upper part of the LPG washing tower 3, an LPG washing tower air inlet 303 and a third heavy hydrocarbon exhaust port 304 are arranged at the lower part of the LPG washing tower 3, and the LPG washing tower air inlet 303 is communicated with a secondary liquid separating tank air outlet 2042.
Wherein, the upper part of the water washing tower 4 is provided with a water washing gas exhaust port 401, the lower part is provided with a water washing tower air inlet 402 and a washing water exhaust port 403, the water washing tower air inlet 402 is communicated with the LPG washing tower exhaust port 302, and the washing water exhaust port 403 is communicated with the Fischer-Tropsch water treatment device 6.
Wherein, the cryogenic separation cryogenic scrubber 5 is provided with a cryogenic scrubber gas inlet 501, a tail gas outlet 502, an LNG outlet 503 and an LPG outlet 504, and the cryogenic separation cryogenic scrubber gas inlet 501 is communicated with the water scrubber gas outlet 401 of the water scrubber.
The embodiment of the invention also correspondingly provides a method for carrying out cobalt-based fixed bed Fischer-Tropsch synthesis purge gas treatment by using the treatment device, which comprises the following steps:
a) Precooling the Fischer-Tropsch synthesis purge gas of the cobalt-based fixed bed to 35-45 ℃ through circulating water of a primary cooling device 201, and separating by a primary liquid separation tank 202 to obtain first heavy hydrocarbon and first separated gas;
b) Exchanging heat of the first separated gas through a secondary cooling device 203, cooling the first separated gas to 3-7 ℃ through a refrigerant, and separating the first separated gas through a secondary liquid separation tank 204 to obtain second heavy hydrocarbon and second separated gas;
c) The second separation gas is sent into an LPG washing tower 3 from an LPG washing tower gas inlet 303, LPG is sent into the LPG washing tower 3 from an LPG input port 301, and third heavy hydrocarbon and third separation gas are obtained through washing in the LPG washing tower 3;
d) Heating the third separated gas to 25-35 ℃, sending the third separated gas into a water washing tower 4, and washing the third separated gas with water to obtain water washing gas;
e) And (3) feeding the washing gas into a cryogenic separation device low-temperature washing tower 5, washing by using a cold box condensate to separate LPG (liquefied petroleum gas) to obtain LNG (liquefied natural gas), and extracting hydrogen from tail gas by using PSA (pressure swing adsorption).
Furthermore, the washing tower 4 is provided with an upper section of packing and a lower section of packing, the step d) adopts a mode of upper and lower sections of washing, the upper section of washing uses the Fischer-Tropsch water treatment device 6 to treat qualified recycled water and fresh water, the lower section of washing adopts the bottom part of the tower to carry back water, and the residual bottom water is pumped out from the washing water discharge port 403 and then is sent into the Fischer-Tropsch water treatment device 6.
Further, the first heavy hydrocarbon, the second heavy hydrocarbon and the third heavy hydrocarbon in the steps a), b) and c) are discharged and merged through the first heavy hydrocarbon discharge port 2021, the second heavy hydrocarbon discharge port 2041 and the third heavy hydrocarbon discharge port 304 respectively, and then are fed into the hydrorefining unit 7.
Further, the LPG washing tower exhaust port 302 is communicated to the secondary cooling device 203, passes through a heat exchange pipeline of the secondary cooling device 203 and is communicated to the water washing tower air inlet 402, in the step d), the third separation gas enters the secondary cooling device 203 to exchange heat with the first separation gas in the step b), so that the effect of temperature rise is achieved, independent temperature rise and temperature reduction of the third separation gas are not needed, and energy and production resources are greatly saved.
Further, an LPG discharge port 504 of the cryogenic separation low-temperature washing tower 5 is communicated to an LPG input port 301 of the LPG washing tower 3, the LPG separated in the step e) is heated and then is sent to the LPG washing tower 3 in the step c) for washing the second separated gas, so that the effect of recycling the LPG is achieved, the production flow is simplified, and resource waste is avoided.
Example 1
The embodiment provides a method for performing cobalt-based fixed bed Fischer-Tropsch synthesis purge gas treatment by using the treatment device, which specifically comprises the following steps:
s101, graded precooling: and precooling the cobalt-based fixed bed Fischer-Tropsch synthesis purge gas to 35-45 ℃ through circulating water of a primary cooling device 201, separating the gas through a primary separating tank 202 to obtain first heavy hydrocarbon and first separated gas, exchanging heat of the first separated gas through a secondary cooling device 203, cooling the gas to 3-7 ℃ through a refrigerant, and separating the gas through a secondary separating tank 204 to obtain second heavy hydrocarbon and second separated gas.
S102, LPG washing: and the second separated gas is sent into an LPG washing tower 3 from an LPG washing tower gas inlet 303, LPG is sent into the LPG washing tower 3 from an LPG input port 301, and the third hydrocarbon and the third separated gas are obtained by washing the LPG washing tower 3.
S103, heavy hydrocarbon collection treatment: the first heavy hydrocarbon, the second heavy hydrocarbon and the third heavy hydrocarbon are discharged through a first heavy hydrocarbon discharge port 2021, a second heavy hydrocarbon discharge port 2041 and a third heavy hydrocarbon discharge port 304 respectively, are merged and then are sent to the hydrorefining device 7.
S104, water washing: and heating the third separated gas to 25-35 ℃, sending the third separated gas into a washing tower 4, washing with water to remove acid and fusel to obtain washing gas, treating qualified recycled water and fresh water by using a Fischer-Tropsch water treatment device 6 in the upper washing section by adopting a mode of upper and lower washing sections, and pumping the rest water at the bottom of the tower from a washing water discharge port 403 and sending the water into the Fischer-Tropsch water treatment device 6 in the lower washing section by adopting partial reflux water at the bottom of the tower.
S105, cryogenic separation: and (3) sending the water washing gas into a cryogenic separation device low-temperature washing tower 5, washing through condensate of a cold box, separating out LPG (liquefied petroleum gas) to obtain LNG, extracting hydrogen from tail gas through PSA (pressure swing adsorption), and sending the LPG into an LPG washing tower 3 after temperature rise for washing second separated gas.
The treatment method has the advantages that the treatment method comprises the steps of closing stage by stage, separating stage by stage, precooling stage by stage and scrubbing LPG to thoroughly remove heavy hydrocarbon in purge gas; acid and fusel in the purge gas are removed by washing, and a two-stage washing mode is adopted, so that the purge gas is removed more thoroughly, and water and energy are saved; LPG separated by the cryogenic separation device low-temperature washing tower is returned to the LPG washing tower for recycling, so that energy is saved and consumption is reduced. The whole device has simple process, safety and reliability, saves energy and effectively recovers gas components with economic benefits.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (6)
1. The treatment device for the Fischer-Tropsch synthesis purge gas of the cobalt-based fixed bed is positioned between a Fischer-Tropsch synthesis device and a Fischer-Tropsch water treatment device and is characterized by comprising
The device comprises a purge gas fractional condensation device, a gas inlet of the first-stage cooling device is communicated with a purge gas discharge port of the Fischer-Tropsch synthesis device, and the first-stage liquid separation tank and the second-stage liquid separation tank are respectively provided with a first heavy hydrocarbon discharge port and a second heavy hydrocarbon discharge port;
the upper part of the LPG washing tower is provided with an LPG input port and an LPG washing tower exhaust port, the lower part of the LPG washing tower is provided with an LPG washing tower air inlet and a third hydrocarbon exhaust port, and the LPG washing tower air inlet is communicated with the secondary liquid separating tank air outlet;
the upper part of the washing tower is provided with a washing gas exhaust port, the lower part of the washing tower is provided with a washing tower gas inlet and a washing water exhaust port, the washing tower gas inlet is communicated with the LPG washing tower gas exhaust port, and the washing water exhaust port is communicated to the Fischer-Tropsch water treatment device;
and
the cryogenic separation low-temperature washing tower is provided with a low-temperature washing tower air inlet, a tail gas outlet, an LNG outlet and an LPG outlet, and the cryogenic separation low-temperature washing tower air inlet is communicated with the washing gas outlet of the washing tower;
the gas outlet of the LPG washing tower is communicated to the secondary cooling device, passes through a heat exchange pipeline of the secondary cooling device and is communicated to the gas inlet of the water washing tower;
wherein the LPG discharge of the cryogenic separation cryogenic wash column is communicated to the LPG input of the LPG wash column.
2. The apparatus for treating purge gas from Fischer-Tropsch synthesis of a cobalt-based fixed bed according to claim 1, wherein the water scrubber is provided with upper and lower stages of packing.
3. The apparatus for treating purge gas from Fischer-Tropsch synthesis of a cobalt-based fixed bed according to claim 1, wherein the first heavy hydrocarbon discharge port, the second heavy hydrocarbon discharge port and the third heavy hydrocarbon discharge port are merged and then communicated to a hydrorefining device.
4. A treatment method of Fischer-Tropsch synthesis purge gas of a cobalt-based fixed bed is characterized by comprising the following steps: the treatment method is carried out by using the treatment device of any one of claims 1 to 3, and comprises the following steps:
a) Precooling the Fischer-Tropsch synthesis purge gas of the cobalt-based fixed bed to 35-45 ℃ through circulating water of the primary cooling device, and separating by using the primary separating tank to obtain first heavy hydrocarbon and first separated gas;
b) Exchanging heat of the first separated gas through the secondary cooling device, cooling the first separated gas to 3-7 ℃ through a refrigerant, and separating the first separated gas through the secondary liquid separation tank to obtain second heavy hydrocarbon and second separated gas;
c) Feeding the second separated gas into an LPG washing tower from an LPG washing tower gas inlet, feeding LPG into the LPG washing tower from an LPG input port, and washing the LPG washing tower to obtain third heavy hydrocarbon and third separated gas;
d) Heating the third separated gas to 25-35 ℃, then sending the third separated gas into a water washing tower, and washing the third separated gas with water to obtain water washing gas;
e) Feeding the washing gas into a cryogenic separation device low-temperature washing tower, washing by using condensate of a cold box, separating LPG (liquefied petroleum gas) to obtain LNG (liquefied natural gas), and extracting hydrogen from tail gas by using PSA (pressure swing adsorption);
in the step d), the temperature of the third separated gas is raised in a heat exchange mode with the first separated gas in the step b);
wherein the LPG separated in the step e) is sent to the LPG washing tower in the step c) after being heated for washing the second separated gas.
5. The method for treating Fischer-Tropsch synthesis purge gas of a cobalt-based fixed bed according to claim 4, wherein a manner of upper and lower water washing sections is adopted in step d), the upper water washing section uses a Fischer-Tropsch water treatment device to treat qualified recycle water and fresh water, the lower water washing section uses reflux water from the bottom of the tower, and the residual water from the bottom of the tower is pumped out from the washing water discharge port and then is fed into the Fischer-Tropsch water treatment device.
6. The method for treating the cobalt-based fixed bed Fischer-Tropsch synthesis purge gas of claim 4, wherein the first heavy hydrocarbon, the second heavy hydrocarbon and the third heavy hydrocarbon in the steps a), b) and c) are discharged from the first heavy hydrocarbon discharge outlet, the second heavy hydrocarbon discharge outlet and the third heavy hydrocarbon discharge outlet respectively and are merged and then sent to a hydrofining device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710208632.0A CN106938170B (en) | 2017-03-31 | 2017-03-31 | Treatment device and treatment method for Fischer-Tropsch synthesis purge gas of cobalt-based fixed bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710208632.0A CN106938170B (en) | 2017-03-31 | 2017-03-31 | Treatment device and treatment method for Fischer-Tropsch synthesis purge gas of cobalt-based fixed bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106938170A CN106938170A (en) | 2017-07-11 |
| CN106938170B true CN106938170B (en) | 2023-02-28 |
Family
ID=59464598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710208632.0A Active CN106938170B (en) | 2017-03-31 | 2017-03-31 | Treatment device and treatment method for Fischer-Tropsch synthesis purge gas of cobalt-based fixed bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106938170B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981287A (en) * | 2018-09-09 | 2018-12-11 | 杭州紫明冷链科技有限责任公司 | A kind of anti-icing stifled multistage drain formula liquefier |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1944358A (en) * | 2006-09-05 | 2007-04-11 | 上海兖矿能源科技研发有限公司 | Method for recovering low carbon hydrocarbon from Fischer-Tropsch process exhaust |
| KR20090116054A (en) * | 2008-05-06 | 2009-11-11 | 한국화학연구원 | Cobalt-based catalyst for fischer-tropsch synthesis and method for preparing the same |
| CA2687015A1 (en) * | 2008-12-11 | 2010-06-11 | General Electric Company | Deep chilled air washer |
| CN102353233A (en) * | 2011-08-03 | 2012-02-15 | 成都蜀远煤基能源科技有限公司 | Process method and device for cryogenically separating and liquefying gas obtained after coal gas methanation |
| CN102485850A (en) * | 2010-12-06 | 2012-06-06 | 贵州兴化化工股份有限公司 | Semi-water gas dedusting cooling method and device thereof |
| CN104150670A (en) * | 2014-08-29 | 2014-11-19 | 神华集团有限责任公司 | Processing device and method for Fischer-Tropsch synthetic water |
| CN105461172A (en) * | 2015-12-16 | 2016-04-06 | 中科合成油技术有限公司 | Purifying and recycling method of fetto synthetic water |
| CN105838465A (en) * | 2016-05-20 | 2016-08-10 | 北京中科瑞奥能源科技股份有限公司 | Process and system for preparing liquefied natural gas by utilizing Fischer-Tropsch synthesis tail gas |
| CN105944544A (en) * | 2016-07-13 | 2016-09-21 | 北京华福工程有限公司 | Petrochemical acidic tail gas treatment system |
| CN106256813A (en) * | 2015-06-16 | 2016-12-28 | 中国石化工程建设有限公司 | A kind of separation and recovery method of Fischer-Tropsch process exhaust |
| CN206652355U (en) * | 2017-03-31 | 2017-11-21 | 武汉金中石化工程有限公司 | A kind of processing unit of cobalt-based fixed bed F- T synthesis off-gas |
-
2017
- 2017-03-31 CN CN201710208632.0A patent/CN106938170B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1944358A (en) * | 2006-09-05 | 2007-04-11 | 上海兖矿能源科技研发有限公司 | Method for recovering low carbon hydrocarbon from Fischer-Tropsch process exhaust |
| KR20090116054A (en) * | 2008-05-06 | 2009-11-11 | 한국화학연구원 | Cobalt-based catalyst for fischer-tropsch synthesis and method for preparing the same |
| CA2687015A1 (en) * | 2008-12-11 | 2010-06-11 | General Electric Company | Deep chilled air washer |
| CN102485850A (en) * | 2010-12-06 | 2012-06-06 | 贵州兴化化工股份有限公司 | Semi-water gas dedusting cooling method and device thereof |
| CN102353233A (en) * | 2011-08-03 | 2012-02-15 | 成都蜀远煤基能源科技有限公司 | Process method and device for cryogenically separating and liquefying gas obtained after coal gas methanation |
| CN104150670A (en) * | 2014-08-29 | 2014-11-19 | 神华集团有限责任公司 | Processing device and method for Fischer-Tropsch synthetic water |
| CN106256813A (en) * | 2015-06-16 | 2016-12-28 | 中国石化工程建设有限公司 | A kind of separation and recovery method of Fischer-Tropsch process exhaust |
| CN105461172A (en) * | 2015-12-16 | 2016-04-06 | 中科合成油技术有限公司 | Purifying and recycling method of fetto synthetic water |
| CN105838465A (en) * | 2016-05-20 | 2016-08-10 | 北京中科瑞奥能源科技股份有限公司 | Process and system for preparing liquefied natural gas by utilizing Fischer-Tropsch synthesis tail gas |
| CN105944544A (en) * | 2016-07-13 | 2016-09-21 | 北京华福工程有限公司 | Petrochemical acidic tail gas treatment system |
| CN206652355U (en) * | 2017-03-31 | 2017-11-21 | 武汉金中石化工程有限公司 | A kind of processing unit of cobalt-based fixed bed F- T synthesis off-gas |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106938170A (en) | 2017-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9856197B2 (en) | Systems and methods for manufacture of dimethyl ether (DME) from natural gas and flare gas feedstock | |
| CN103232312B (en) | Device and process for preparing isobutylene by dehydrogenating isobutane | |
| CN102382680B (en) | Combined technology of catalytic cracking absorbing stabilizing system and C3 intercooling oil absorption | |
| CN103275777A (en) | Method for preparing hydrogen and liquefied natural gas through using gas retort raw gas | |
| CN203794811U (en) | Reaction product separation system for methanol-to-propylene and methanol-to-olefin | |
| EA006062B1 (en) | Integrated processing of natural gas into liquid products | |
| CN104628508A (en) | System and process for preparing alkene from raw materials of coal and natural gas by virtue of synthesis | |
| CN104119975A (en) | Method of combined production of methanol and liquefied natural gas in coking plant | |
| CN103820183B (en) | A kind of oven gas directly mends the method for carbon dioxide synthetic natural gas | |
| CN104177214B (en) | A kind of catalytic cracking rich gas and methanol to olefins reaction product composite liberation method | |
| CN104609369B (en) | A kind ofly petroleum refinery is resolved the method that exhaust gas conversion becomes process for making hydrogen unstripped gas | |
| CN105779046A (en) | Method for preparing LNG (Liquefied Natural Gas) by using Fischer-Tropsch synthesis tail gas as raw material | |
| RU2502717C1 (en) | Method for comprehensive treatment of refinery hydrocarbon gas | |
| CN106938170B (en) | Treatment device and treatment method for Fischer-Tropsch synthesis purge gas of cobalt-based fixed bed | |
| CN210560161U (en) | Fischer-Tropsch synthesis tail gas recycling device | |
| CN105838465A (en) | Process and system for preparing liquefied natural gas by utilizing Fischer-Tropsch synthesis tail gas | |
| CN104560194B (en) | Refinery saturated dry gas recovery system and recovery method | |
| CN107245357A (en) | A kind of energy saving technique for coal gasification synthesis gas preparing natural gas | |
| CN109456139B (en) | Oil absorption separation method for reaction product of preparing ethylene from methane | |
| CN208356427U (en) | Fischer-Tropsch process exhaust purification device | |
| CN113368663B (en) | Treatment method of Fischer-Tropsch synthesis decarbonized tail gas and equipment system for implementing method | |
| CN208182936U (en) | A kind of device for producing LNG/CNG and hydrogen using methanol-to-olefins Methane offgas | |
| CN206652355U (en) | A kind of processing unit of cobalt-based fixed bed F- T synthesis off-gas | |
| CA2751540C (en) | A method for recovering hydrocarbon compounds and a hydrocarbon recovery apparatus from a gaseous by-product | |
| US20210102753A1 (en) | Process for producing synthesis gas originating from a natural gas liquefaction process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |