CN113234496A - Low-temperature methanol-rich solution flash steam CO2And H2S removing device - Google Patents

Low-temperature methanol-rich solution flash steam CO2And H2S removing device Download PDF

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Publication number
CN113234496A
CN113234496A CN202110570928.3A CN202110570928A CN113234496A CN 113234496 A CN113234496 A CN 113234496A CN 202110570928 A CN202110570928 A CN 202110570928A CN 113234496 A CN113234496 A CN 113234496A
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liquid
tower
flash
gas
inlet
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CN202110570928.3A
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Chinese (zh)
Inventor
刘金成
郭彦书
赵素峰
王洪忠
许建锋
赵艳平
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Priority to CN202110570928.3A priority Critical patent/CN113234496A/en
Publication of CN113234496A publication Critical patent/CN113234496A/en
Priority to CN202220762529.7U priority patent/CN219156823U/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
    • C10K1/165—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids at temperatures below zero degrees Celsius
    • 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
    • B01D53/14—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 absorption
    • B01D53/1456—Removing acid components
    • B01D53/1468—Removing hydrogen sulfide
    • 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
    • B01D53/14—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 absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • 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
    • B01D53/14—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 absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/005—Carbon dioxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Industrial Gases (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses low-temperature methanol washing pregnant solution flash steam CO2And H2The S removing device is characterized in that the conversion gas is connected with a gas inlet of a washing tower, and a liquid outlet of a decarburization section of the washing tower is respectively connected with a washing liquid inlet of a desulfurization section of the washing tower and a H-free liquid outlet of a desulfurization section of the washing tower2The inlet of the S rich solution flash tank is connected and does not contain H2Gas outlet and CO removal of S-rich liquid flash tank2、H2The gas inlet of the S tower is connected, and the liquid outlet of the desulfurization section of the washing tower is connected with the gas inlet containing H2The inlet of the S rich solution flash tank is connected and contains H2Gas outlet and CO removal of S-rich liquid flash tank2、H2The lower inlet of the S tower is connected without H2A part of the semi-lean methanol solution of S andCO removal2、H2The upper section of the S tower is connected with a liquid inlet, and the other part of the S tower is connected with CO removal2、H2The lower segment of the S tower is connected with a liquid inlet, and the flash steam is subjected to CO removal2、H2The upper section liquid outlet and the lower section liquid outlet of the S tower are converged and then connected with a regeneration system without H2Liquid outlet of S-rich liquid flash evaporation tank and H-containing liquid2The liquid outlets of the S rich liquid flash evaporation tank are respectively connected with a regeneration system, and the CO in the flash evaporation gas is removed2、H2The flash evaporation gas of the S tower is pressurized by the compressor and then is connected with the feed gas, so that the power consumption of the compressor is saved, and the operation load of the system is reduced.

Description

Low-temperature methanol-rich solution flash steam CO2And H2S removing device
Technical Field
The invention relates to a method for removing CO from flash steam of low-temperature methanol rich washing liquid2、H2And S.
Background
At present, crude gas generated by coal pressure gasification in industry is converted and then cleaned into gas by using low-temperature methanol, and as shown in figure 1, a washing tower 1 absorbs CO in converted gas2、H2After S and other gases, the liquid in decarbonizing stage and desulfurizing stage are respectively fed into a reactor without H2S rich liquid flash drum 2 and H-containing2The S rich solution flash tank 4 is used for flash evaporation and contains about 80 percent of CO2And about 20% of H2The flash evaporation gas is pressurized by a recycle gas compressor 3 and then sent to a raw material gas pipeline to recover a useful component H2. But high concentration of CO in the flash gas2The gas not only increases the power consumption of the recycle gas compressor 3, but also increases the load of the decarburization system.
Disclosure of Invention
The invention provides low-temperature methanol rich washing solution flash steam CO2And H2An S removing device, which overcomes the defects of the prior art.
For the purpose of the invention, the low-temperature methanol rich solution flash steam CO is used2And H2An S removal unit comprising a wash column connected to a H-free column2S rich liquid flash tank and H-containing2The S rich liquid flash evaporation tank is characterized in that the conversion gas is connected with a gas inlet of a washing tower, and a liquid outlet at the bottom of a decarburization section of the washing tower is respectively connected with a washing liquid inlet and a H-free liquid inlet of a desulfurization section of the washing tower2The inlet of the S rich solution flash tank is connected and does not contain H2Flash evaporation of S rich liquidCO removal from the tank gas outlet and the flash gas2、H2The upper section gas inlet of the S tower is connected, and the desulfurization section liquid outlet of the washing tower is connected with the tower body containing H2The inlet of the S rich solution flash tank is connected and contains H2CO removal from gas outlet of S-rich liquid flash evaporation tank and flash evaporation gas2、H2The lower segment of the S tower is connected with a gas inlet without containing H2CO removal of part of semi-lean methanol liquid of S and flash evaporation gas2、H2The upper section of the S tower is connected with a liquid inlet, and the other part of the S tower is connected with flash steam for removing CO2、H2The lower segment of the S tower is connected with a liquid inlet, and the flash steam is subjected to CO removal2、H2The upper liquid outlet of the S tower does not contain H2The liquid outlet of the S rich liquid flash tank is connected with a regeneration system in a converging way, and the CO in the flash gas is removed2、H2The lower section of the S tower has a liquid outlet and contains H2The liquid outlet of the S rich liquid flash tank is connected with a regeneration system in a converging way or the flash gas is subjected to CO removal2、H2The upper section liquid outlet and the lower section liquid outlet of the S tower are converged and then connected with a regeneration system, and the CO is removed from the flash evaporation gas2、H2The flash evaporation gas of the S tower is pressurized by a circulating gas compressor and then is connected with a raw gas pipeline.
The invention achieves the technical progress that:
1. CO removal from flash steam2、H2The S tower does not contain H2S semi-poor methanol solution can be absorbed to remove H2S rich liquid flash tank and H-containing2Most of CO in flash gas of S rich liquid flash evaporation tank2、H2S, etc. gases, containing predominantly H2CO removal from flash gas by tail gas2、H2The knockout tower of the S tower is recovered, and most CO in the flash steam2、H2The removal of S and other gases saves the power consumption of the recycle gas compressor by about 50 to 70 percent, and reduces the running load of the decarburization system.
2. CO removal from flash steam2、H2The liquid outlet at the upper section of the S column is free of H2S methanol-rich liquid and lower segment liquid outlet mouth H2The S methanol-rich liquid can be regenerated after being mixed according to the requirements of the process and the equipment, and can also be respectively mixed with the flashed H-free methanol-rich liquid2S methanol-rich liquid and H-containing liquid2And combining the flash evaporated methanol-rich liquid of S and then sending the combined liquid to a regeneration system.
Drawings
FIG. 1 shows CO in flash gas2、H2S the structure schematic diagram of the existing removing device.
FIG. 2 is a schematic view of the structure of the present invention.
Fig. 3 is a schematic structural diagram of another implementation manner of the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1: as shown in FIG. 2, the low-temperature methanol rich liquid flash steam CO2And H2The S removal device comprises a washing tower 1 and a tower containing H2The S rich liquid flash tank 4, the conversion gas is connected with the gas inlet of the washing tower 1, and the lean methanol absorbs CO in the conversion gas in the washing tower 12And H2And (S) and the like, and discharging the purified gas from the tower top. The liquid outlet at the bottom of the decarbonization section of the washing tower 1 does not contain H2One part of the S methanol-rich liquid is sent to a desulfurizing section of a washing tower 1 to be used as H removal2S, and the other part of the washing liquid does not contain H2The inlet of the S rich liquid flash tank 2 is connected with the other end of the S rich liquid flash tank for gas flash evaporation, and H is not contained2CO removal from gas outlet of S rich solution flash tank 2 and flash steam2、H2The upper section gas inlet of the S tower 5 is connected, and the methanol-rich liquid and the H-containing liquid at the liquid outlet of the desulfurization section of the washing tower 12The inlet of the S rich liquid flash tank 4 is connected, and the flash tank 4 is used for gas flash evaporation. Containing H2CO removal from gas outlet of S rich liquid flash evaporation tank 4 and flash steam2、H2The lower segment of the S tower 5 is connected with a gas inlet and comes from a regeneration system without H2CO removal of part of S semi-lean methanol liquid and flash steam2、H2The upper section of the S tower 5 is connected with a liquid inlet, and the other part of the S tower is connected with flash steam for removing CO2、H2The liquid inlet at the lower section of the S tower 5 is connected, and CO in the flash steam entering the tower is absorbed in the tower2、H2S, etc. gas mainly containing H2The tail gas is discharged from the tower top into a circulating compressor 3, pressurized and then connected with a raw gas pipeline, and the CO is removed from flash gas2、H2An upper section liquid outlet and a lower section liquid outlet of the S tower 5 are converged through a pipeline 6 and then enter a regeneration system.
Example 2: as shown in FIG. 3, the difference between this example and example 1 is that the flash steam is subjected to decarburizationO2、H2The upper liquid outlet of the S-tower 5 is free of H2The liquid outlet of the S rich liquid flash tank 2 is converged through a pipeline 7 and then enters a regeneration system; CO removal by flash steam2、H2The lower liquid outlet of the S-tower 5 and the liquid containing H2And a liquid outlet of the S rich liquid flash tank 4 is converged through a pipeline 8 and then enters a regeneration system.

Claims (2)

1. Low-temperature methanol-rich solution flash steam CO2And H2An S removal device comprising a wash column (1) connected to a hydrogen-free H-free S removal system2S rich liquid flash tank (2) and H-containing liquid2The S rich liquid flash evaporation tank (4) is characterized in that the conversion gas is connected with a gas inlet of the washing tower (1), and a liquid outlet at the bottom of a decarburization section of the washing tower (1) is respectively connected with a washing liquid inlet of a desulfurization section of the washing tower (1) and a washing liquid inlet without H2The inlet of the S rich liquid flash tank (2) is connected and does not contain H2CO removal from the gas outlet of the S rich solution flash tank (2) and the flash gas2、H2The upper section gas inlet of the S tower (5) is connected, and the desulfurization section liquid outlet of the washing tower (1) is connected with the tower body containing H2The inlet of the S rich liquid flash tank (4) is connected and contains H2CO removal from the gas outlet of the S rich solution flash tank (4) and the flash gas2、H2The lower segment of the S tower (5) is connected with a gas inlet without H2CO removal of part of semi-lean methanol liquid of S and flash evaporation gas2、H2The upper section liquid inlet of the S tower (5) is connected, and the other part is connected with flash steam for CO removal2、H2The lower segment of the S tower (5) is connected with a liquid inlet, and the flash steam is used for removing CO2、H2The upper section liquid outlet and the lower section liquid outlet of the S tower (5) are converged and then connected with a regeneration system without containing H2Liquid outlet of S rich liquid flash tank (2) and H-containing liquid2The liquid outlets of the S rich liquid flash tank (4) are respectively connected with a regeneration system, and the CO is removed from the flash steam2、H2Flash steam of the S tower (5) is pressurized by a recycle gas compressor (3) and then is connected with a raw gas pipeline.
2. The low-temperature methanol washing rich liquid flash gas CO according to claim 12And H2The S removing device is characterized in that the flash evaporation gas is subjected to CO removal2、H2S column (A)5) Upper liquid outlet and no H2The liquid outlet of the S rich liquid flash tank (2) is merged and then connected with a regeneration system, and the CO is removed from flash steam2、H2The lower section liquid outlet of the S tower (5) and the liquid containing H2And a liquid outlet of the S rich liquid flash tank (4) is converged and then connected with a regeneration system.
CN202110570928.3A 2021-05-25 2021-05-25 Low-temperature methanol-rich solution flash steam CO2And H2S removing device Withdrawn CN113234496A (en)

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CN202110570928.3A CN113234496A (en) 2021-05-25 2021-05-25 Low-temperature methanol-rich solution flash steam CO2And H2S removing device
CN202220762529.7U CN219156823U (en) 2021-05-25 2022-04-02 Low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 S removing device

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CN202110570928.3A CN113234496A (en) 2021-05-25 2021-05-25 Low-temperature methanol-rich solution flash steam CO2And H2S removing device

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CN202220762529.7U Active CN219156823U (en) 2021-05-25 2022-04-02 Low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 S removing device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114015481A (en) * 2021-11-16 2022-02-08 兰州理工大学 Short-flow low-temperature methanol washing system and process thereof
CN117125673A (en) * 2023-08-22 2023-11-28 山东福富新材料科技有限公司 Large-scale carbon capture system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114015481A (en) * 2021-11-16 2022-02-08 兰州理工大学 Short-flow low-temperature methanol washing system and process thereof
CN114015481B (en) * 2021-11-16 2023-09-05 兰州理工大学 Short-flow low-temperature methanol washing system and process thereof
CN117125673A (en) * 2023-08-22 2023-11-28 山东福富新材料科技有限公司 Large-scale carbon capture system
CN117125673B (en) * 2023-08-22 2024-02-13 山东福富新材料科技有限公司 Large-scale carbon capture system

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