CN219156823U - Low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 S removing device - Google Patents

Low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 S removing device Download PDF

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Publication number
CN219156823U
CN219156823U CN202220762529.7U CN202220762529U CN219156823U CN 219156823 U CN219156823 U CN 219156823U CN 202220762529 U CN202220762529 U CN 202220762529U CN 219156823 U CN219156823 U CN 219156823U
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liquid
flash
gas
tower
inlet
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刘金成
董樵
许建锋
赵艳平
刘慧琴
吴海良
牛肖锋
石松涛
黄启辰
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Hebei Zhengyuan Hydrogen Energy Technology Co Ltd
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Hebei Zhengyuan Hydrogen Energy Technology Co Ltd
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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 utility model relates to a low-temperature methanol-washing rich liquid flash steam CO2 and H2S removing device, which comprises a washing tower provided with a conversion gas inlet, wherein a liquid outlet of a decarburization section of the washing tower is respectively connected with a washing liquid inlet of a desulfurization section and a rich liquid flash tank inlet without H2S, a liquid outlet of the desulfurization section is connected with a rich liquid flash tank inlet with H2S, gas outlets of the two rich liquid flash tanks are respectively connected with a gas inlet of an upper section and a gas inlet of a lower section of a flash gas CO2 removing tower and a gas inlet of an H2S removing tower, the upper section and the lower section of the tower are respectively provided with a semi-lean methanol liquid inlet without H2S, liquid outlets of the upper section and the lower section of the tower and liquid outlets of the two rich liquid flash tanks are both connected with a regeneration system, and flash gas outlets of the flash gas CO2 removing tower and the H2S removing tower are connected with a raw material pipeline through a circulating gas compressor. The utility model uses semi-lean methanol to remove CO2 in flash steam of more than 80%, saves 50% -70% power consumption of a circulating gas compressor, and effectively reduces the operation load of a decarburization system.

Description

Low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 S removing device
Technical Field
The utility model relates to a low-temperature methanol-washing rich liquid flash vapor CO 2 And H 2 S remove device belongs to crude gas purification technical field.
Background
At present, the raw gas generated by pressurized gasification of industrial coal is converted and then is cleaned by low-temperature methanol, as shown in figure 1, and the CO in the converted gas is absorbed by a washing tower 2 、H 2 S and other gases, the liquid of the decarburization section and the desulfurization section respectively enter the gas without H 2 S-rich liquid flash tank and H-containing liquid flash tank 2 Flash evaporation is carried out in an S rich solution flash evaporation tank, and the S rich solution contains about 80 percent of CO 2 And about 20% of H 2 Is pressurized by a recycle gas compressor and then sent to a raw material gas pipeline to recover useful component H 2 . But high concentration of CO in flash gas 2 The gas not only increases the power consumption of the recycle gas compressor, but also severely increases the load on the decarbonization system.
Disclosure of Invention
The utility model aims to provide a low-temperature methanol-rich liquid flash vapor CO 2 And H 2 S removing device to overcome the defect existing in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 The S removing device comprises a washing tower, wherein the washing tower is provided with a change gas inlet, and a liquid outlet at the bottom of a decarbonization section of the washing tower is respectively connected with a washing liquid inlet of a desulfurization section of the washing tower and does not contain H 2 The inlet of the S rich liquid flash tank is connected, and the S rich liquid flash tank does not contain H 2 Gas outlet of S-rich liquid flash tank and CO removal of flash gas 2 、H 2 The upper section gas inlet of the S tower is connected; liquid outlet of desulfurization section of washing tower and H-containing liquid 2 The inlet of the S rich liquid flash tank is connected with the H-containing flash tank 2 Gas outlet of S-rich liquid flash tank and CO removal of flash gas 2 、H 2 The lower gas inlet of the S tower is connected, and the flash gas is used for removing CO 2 、H 2 The upper section and the lower section of the S tower are respectively provided with a tower which does not contain H 2 S semi-lean methanol liquid inlet, the flash gas is used for CO removal 2 、H 2 The upper section liquid outlet and the lower section liquid outlet of the S tower are connected with a regeneration system after being converged through a pipeline; the composition does not contain H 2 Liquid outlet of S-rich liquid flash tank and H-containing liquid 2 The liquid outlets of the S-rich liquid flash tanks are respectively connected with a regeneration system, and the flash gas is subjected to CO removal 2 、H 2 The flash gas outlet of the S tower is connected with a raw material gas pipeline after passing through a circulating gas compressor.
The technical scheme of the utility model is further improved as follows: the flash gas is used for removing CO 2 、H 2 S tower upper section liquid outletDoes not contain H 2 The liquid outlets of the S-rich liquid flash tank are converged and then connected with a regeneration system, and the flash gas is subjected to CO removal 2 、H 2 S tower lower section liquid outlet and H-containing liquid outlet 2 And the liquid outlets of the S rich liquid flash tanks are converged and then connected with a regeneration system.
By adopting the technical scheme, the utility model has the following technical effects:
the utility model flash steam is used for removing CO 2 、H 2 The S tower does not contain H 2 S semi-lean methanol liquid can absorb H-free 2 S-rich liquid flash tank and H-containing liquid flash tank 2 Most of the CO in the flash gas of the S-rich flash drum 2 、H 2 S and other gases, tail gas H 2 CO removal from flash gas 2 、H 2 The ejection tower of the S tower is recovered, and most of CO in flash steam 2 、H 2 The removal of S and other gases saves about 50-70% of power consumption of the circulating gas compressor, and meanwhile, the operation load of a decarburization system is effectively reduced.
The utility model flash steam is used for removing CO 2 、H 2 S column upper liquid outlet free of H 2 S methanol-rich liquid and H-containing liquid at lower liquid outlet 2 The S-rich methanol liquid can be mixed according to the requirements of the process and equipment and then regenerated, and can also be respectively mixed with the flash-evaporated H-free liquid 2 S-rich methanol liquid and H-containing liquid after flash evaporation 2 And (3) merging the S-rich methanol solution and then sending the mixed solution to a regeneration system.
Drawings
FIG. 1 is CO in flash gas 2 、H 2 S, a structural schematic diagram of the existing removing device;
FIG. 2 is a schematic diagram of the structure of the present utility model;
FIG. 3 is a schematic structural view of embodiment 2 of the present utility model;
wherein, 1, a washing tower, 2, no H 2 S rich liquid flash tank, 3 circulating gas compressor, 4, H-containing 2 S-rich liquid flash tank, 5, flash gas CO removal 2 、H 2 S tower.
Detailed Description
The utility model is further described in detail below with reference to the attached drawings and specific examples:
example 1
Low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 S removing device, as shown in FIG. 2, comprises a washing tower 1 and an H-containing device 2 The S rich solution flash drum 4, the lower end of the washing tower 1 is provided with a gas inlet, the shift gas is connected with the gas inlet of the washing tower 1, and the lean methanol absorbs H in the shift gas in the desulfurization section at the lower section and the decarbonization section at the upper section of the washing tower 1 2 S and CO 2 After waiting for the gas, the purified gas is discharged from the tower top. The liquid outlet at the bottom of the decarbonization section of the washing tower 1 is respectively connected with the washing liquid inlet of the desulfurization section of the washing tower 1 and does not contain H 2 The inlet of the S rich liquid flash tank 2 is connected, and the liquid outlet at the bottom of the decarbonization section of the washing tower 1 does not contain H 2 Part of the S methanol-rich liquid is sent to a desulfurization section of the washing tower 1 to be used for removing H 2 S and other parts of the washing liquid containing no H 2 The inlet of the S rich liquid flash tank 2 is connected to carry out gas flash evaporation; does not contain H 2 S-rich liquid flash tank 2 gas outlet and flash evaporation steam CO removal 2 、H 2 The gas inlet at the upper section of the S tower 5 is connected, and the liquid outlet at the desulfurization section of the washing tower 1 is connected with the H-containing gas inlet 2 The inlet of the S rich liquid flash tank 4 is connected with H-containing 2 S rich solution containing H 2 The gas flash evaporation is performed in the S-rich liquid flash tank 4. Containing H 2 Gas outlet of S-rich liquid flash tank 4 and flash evaporation steam CO removal 2 、H 2 The gas inlet of the lower section of the S tower 5 is connected, and the gas inlet is free of H from a regeneration system 2 Part of semi-lean methanol liquid of S and flash steam for CO removal 2 、H 2 The upper liquid inlet of the S tower 5 is connected, and the other part is connected with the flash steam to remove CO 2 、H 2 The liquid inlet at the lower section of the S tower 5 is connected, and the CO absorbed into the flash gas in the tower is absorbed in the tower 2 、H 2 S and other gases, mainly H 2 Is discharged from the top of the tower and enters a circulating compressor 3 to be pressurized and then is connected with a raw material gas pipeline, and the flash gas is used for removing CO 2 、H 2 The upper liquid outlet and the lower liquid outlet of the S tower 5 are connected with a regeneration system after being converged through pipelines, and the S tower does not contain H 2 Liquid outlet of S-rich liquid flash tank 2 and H-containing liquid 2 The liquid outlets of the S-rich liquid flash tanks 4 are respectively connected with a regeneration system.
Example 2
As shown in fig. 3, this embodiment is different from embodiment 1The flash gas is used for removing CO 2 、H 2 Upper liquid outlet of S column 5 and no H 2 The liquid outlets of the S rich liquid flash tank 2 are converged through a pipeline and then are sent to a regeneration system; flash steam CO removal 2 、H 2 Lower liquid outlet of S column 5 and H-containing liquid 2 The liquid outlets of the S-rich liquid flash tanks 4 are converged through pipelines and then are sent to a regeneration system.

Claims (2)

1. Low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 S remove device, including scrubbing tower (1), its characterized in that: the washing tower (1) is provided with a gas inlet for changing gas, and a liquid outlet at the bottom of the decarbonization section of the washing tower (1) is respectively connected with a washing liquid inlet of the desulfurization section of the washing tower (1) and does not contain H 2 The inlet of the S rich liquid flash tank (2) is connected, and the S rich liquid flash tank does not contain H 2 Gas outlet of S-rich liquid flash tank (2) and CO removal of flash gas 2 、H 2 The upper section gas inlet of the S tower (5) is connected; the liquid outlet of the desulfurization section of the washing tower (1) contains H 2 The inlet of the S rich liquid flash tank (4) is connected, and the H-containing flash tank comprises 2 Gas outlet of S-rich liquid flash tank (4) and CO removal of flash gas 2 、H 2 The lower gas inlet of the S tower (5) is connected, and the flash gas is used for removing CO 2 、H 2 The upper section and the lower section of the S tower (5) are respectively provided with a tower without H 2 S semi-lean methanol liquid inlet, the flash gas is used for CO removal 2 、H 2 The upper section liquid outlet and the lower section liquid outlet of the S tower (5) are connected with a regeneration system after being converged through pipelines; the composition does not contain H 2 Liquid outlet of S-rich liquid flash tank (2) and H-containing liquid 2 The liquid outlets of the S-rich liquid flash tank (4) are respectively connected with a regeneration system, and the flash gas is subjected to CO removal 2 、H 2 The flash gas outlet of the S tower (5) is connected with a raw material gas pipeline after passing through a circulating gas compressor (3).
2. A low temperature methanol rich liquid flash vapor CO according to claim 1 2 And H 2 S remove device, its characterized in that: the flash gas is used for removing CO 2 、H 2 S tower (5) upper liquid outlet and no H 2 S-rich liquid flash tank (2) liquid outletThe flash gas is connected with a regeneration system after the port is converged, and CO is removed 2 、H 2 S tower (5) lower liquid outlet and H-containing liquid outlet 2 The liquid outlets of the S-rich liquid flash tanks (4) are converged and then connected with a regeneration system.
CN202220762529.7U 2021-05-25 2022-04-02 Low-temperature methanol washing rich liquid flash vapor CO 2 And H 2 S removing device Active CN219156823U (en)

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CN2021105709283 2021-05-25
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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CN114015481B (en) * 2021-11-16 2023-09-05 兰州理工大学 Short-flow low-temperature methanol washing system and process thereof
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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