CN111167286A - Pressure swing adsorption decarbonization and vent gas desulfurization device and method - Google Patents

Pressure swing adsorption decarbonization and vent gas desulfurization device and method Download PDF

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Publication number
CN111167286A
CN111167286A CN202010028171.0A CN202010028171A CN111167286A CN 111167286 A CN111167286 A CN 111167286A CN 202010028171 A CN202010028171 A CN 202010028171A CN 111167286 A CN111167286 A CN 111167286A
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tower
alkaline washing
pressure swing
vent gas
swing adsorption
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CN202010028171.0A
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孙彩军
王秀荣
张永成
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Anhui Jinhe Industrial Co Ltd
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Anhui Jinhe Industrial Co Ltd
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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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • 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
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • B01D53/8612—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/304—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to a device and a method for desulfurizing pressure swing adsorption decarbonization vent gas, which comprises a shift gas desulfurization tower and a pressure swing adsorption decarbonization tower, and is characterized in that: a first-stage alkaline washing tower, a second-stage alkaline washing tower and an active carbon adsorption tower are sequentially added behind the pressure swing adsorption decarbonizing tower, and the bottoms of the first-stage alkaline washing tower and the second-stage alkaline washing tower are connected with a regeneration tank; (1) the shift gas enters a desulfurizing tower for desulfurization, and an outlet H2The S content is reduced to 17mg/m3The following; (2) the variable-degassing gas enters a pressure swing adsorption decarbonizing tower to remove most of CO2，H2S is discharged along with the air; (3) the vent gas enters primary and secondary alkali washingDesulfurizing in tower and discharging in H2The S content is reduced to 10mg/m3The following; (4) the vent gas enters an active carbon adsorption tower for adsorption desulfurization, and an outlet H2The S content is reduced to 1.0mg/m3The mixture was directly discharged to the air. The invention has the beneficial effects that: two stages of alkaline washing towers and active carbon adsorption towers are additionally arranged, and the original pressure swing adsorption decarbonization vent gas is purified again through chemical absorption and physical adsorption, so that the problems of standard exceeding of hydrogen sulfide in the original vent gas and environmental pollution are effectively solved.

Description

Pressure swing adsorption decarbonization and vent gas desulfurization device and method
Technical Field
The invention belongs to the technical field of synthetic ammonia production, and relates to a device and a method for pressure swing adsorption decarburization and vent gas desulfurization.
Background
In the existing production of synthetic ammonia, the vent gas of the shift gas after desulfurization and decarburization in the desulfurization tower and the decarburization tower is mostly directly discharged, but with the use of the shift device, the desulfurization capacity of the desulfurization system matched with the shift device is gradually reduced, thereby causing H in the vent gas of the rear working section (the decarburization tower)2The S content does not reach the standard (17 mg/m)3Left and right), direct discharge not only can cause environmental pollution, but also has certain potential safety hazard to the operation of equipment because the acid gas in the blow-down gas has corrosivity.
Disclosure of Invention
The invention aims to solve the problems that pressure swing adsorption decarburization vent gas pollutes the environment, equipment is corroded and is unsafe to operate, and provides a device and a method for desulfurization of adsorption decarburization vent gas.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a desulfurization device of pressure swing adsorption decarbonization unloading, includes transform gas desulfurizing tower, pressure swing adsorption decarbonization tower, its characterized in that: and a primary alkaline washing tower, a secondary alkaline washing tower and an active carbon adsorption tower are sequentially added behind the pressure swing adsorption decarbonizing tower, wherein the bottoms of the primary alkaline washing tower and the secondary alkaline washing tower are connected with a regeneration tank through pipelines to form a circulation loop.
A method for desulfurizing pressure swing adsorption decarbonization vent gas is characterized by comprising the following steps:
(1) the shift gas enters a desulfurizing tower to react with desulfurizing liquid (mixed liquid consisting of sodium carbonate solution and 888 desulfurizing catalyst) in the desulfurizing tower, and H in the shift gas is controlled to be discharged2The S content is 17mg/m3The following;
(2) the desulfurized variable-degassing gas enters a pressure swing adsorption decarbonizing tower, and most CO in the variable-degassing gas2By adsorption removal of H2S with transformationDischarging the vent gas after adsorption and decarburization;
(3) air release (H)2S content is 30mg/m3) Sequentially enters a first-stage alkaline washing tower and a second-stage alkaline washing tower for desulfurization, and H in vent gas from a secondary alkaline washing tower is controlled2The S content is reduced to 10mg/m3The following; wherein, the alkaline washing liquid in the first-stage alkaline washing tower and the second-stage alkaline washing tower is sodium hydroxide solution, and the PH value in the first-stage alkaline washing tower and the second-stage alkaline washing tower is kept between 8.3 and 8.5;
(4) vent gas (containing H) from secondary caustic tower2S) enters an active carbon adsorption tower for adsorption desulfurization, and H in discharged vent gas is controlled2The S content is reduced to 1.0mg/m3And (5) emptying after reaching the standard.
The invention has the beneficial effects that: according to the invention, two stages of alkaline washing towers (a first stage alkaline washing tower and a second stage alkaline washing tower) and an active carbon adsorption tower are additionally arranged, and the original pressure swing adsorption decarburization vent gas is purified again by a chemical absorption and physical adsorption method, so that the problem that hydrogen sulfide in the pressure swing adsorption decarburization vent gas exceeds the standard is effectively solved, wherein alkaline washing liquid (sodium hydroxide) in the first stage alkaline washing tower and the second stage alkaline washing tower can be recycled, and the system has zero liquid discharge.
Drawings
FIG. 1 is a schematic diagram of a pressure swing adsorption decarburization vent gas desulfurization process.
Detailed Description
The invention is further illustrated with reference to fig. 1:
a device for pressure swing adsorption decarburization and vent gas desulfurization comprises the following equipment:
the shift gas desulfurization tower is connected with a pressure swing adsorption decarbonization tower, a first-stage alkaline washing tower, a second-stage alkaline washing tower and an active carbon adsorption tower in sequence,
wherein, the bottom outlet of the first-level alkaline tower is connected to the upper inlet of the first-level alkaline tower through a first-level circulating pump and a control valve by pipelines, the inlet of the circulating pump is connected with the bottom outlet of the regeneration tank, and the pipeline between the circulating pump and the control valve is connected with a pipeline (control valve) connected with the upper inlet of the regeneration tank;
the bottom outlet of the second-stage alkaline washing tower is connected to the upper inlet of the second-stage alkaline washing tower through a second-stage circulating pump and a control valve by pipelines, the inlet of the second-stage circulating pump is connected with the bottom outlet of the regeneration tank, and a pipeline (the control valve) is connected to the pipeline between the second-stage circulating pump and the control valve and is connected with the upper inlet of the regeneration tank.
A method for desulfurizing pressure swing adsorption decarbonization vent gas is characterized by comprising the following steps:
(1) transform the gas to 90000m3The amount of the hydrogen peroxide/H enters a desulfurizing tower to react with desulfurizing liquid in the desulfurizing tower, wherein the desulfurizing is a mixed liquid consisting of sodium carbonate with the total alkalinity of 0.9 gram equivalent per liter and 888 desulfurizing catalyst with the content of 15ppm (known by a person skilled in the art), and H in the degassing is controlled to be changed and discharged2The S content is 17mg/m3The following;
(2) the desulfurized gas is changed into 90000m3The volume of the gas enters a pressure swing adsorption decarbonizing tower, and most CO in the gas is changed and removed2By adsorption removal of H2S is discharged along with the discharged air after pressure swing adsorption decarburization;
(3) air release (H)2S content is 30mg/m3) Sequentially enters a first-stage alkaline washing tower and a second-stage alkaline washing tower for desulfurization, and H in vent gas from a secondary alkaline washing tower is controlled2The S content is reduced to 10mg/m3The alkaline washing liquid in the first-stage alkaline washing tower and the second-stage alkaline washing tower is sodium hydroxide solution, so that the pH value in the first-stage alkaline washing tower and the second-stage alkaline washing tower is kept at 8.5; partial alkaline washing liquid (30-40% of the volume of the alkaline washing liquid) in the primary and secondary alkaline washing towers enters a regeneration tank, sulfur ions in the solution are converted into elemental sulfur for flotation (sulfur is prepared for self-use by a sulfur melting kettle) through oxygen absorption and regeneration, and the regenerated alkaline washing liquid returns to the primary and secondary alkaline washing towers for continuous use;
(4) vent gas (containing H) from secondary caustic tower2S) enters an active carbon adsorption tower for adsorption desulfurization, and H in the discharged gas is removed2The S content is reduced to 0.8 mg/m3And directly discharging.

Claims (2)

1. The utility model provides a desulfurization device of pressure swing adsorption decarbonization unloading, includes transform gas desulfurizing tower, pressure swing adsorption decarbonization tower, its characterized in that: and a primary alkaline washing tower, a secondary alkaline washing tower and an active carbon adsorption tower are sequentially added behind the pressure swing adsorption decarbonizing tower, wherein the bottoms of the primary alkaline washing tower and the secondary alkaline washing tower are connected with a regeneration tank through pipelines to form a circulation loop.
2. A method for desulfurizing pressure swing adsorption decarbonization vent gas is characterized by comprising the following steps:
(1) the shift gas enters a desulfurizing tower to react with desulfurizing liquid in the desulfurizing tower, wherein the desulfurizing liquid is mixed liquid consisting of sodium carbonate solution and 888 desulfurizing catalyst, and H in the outlet variable degassing is controlled2The S content is 17mg/m3The following;
(2) the desulfurized variable-degassing gas enters a pressure swing adsorption decarbonizing tower, and most CO in the variable-degassing gas2By adsorption removal of H2S is discharged along with the vent gas after pressure swing adsorption decarburization;
(3) the vent gas sequentially enters a first-stage alkaline washing tower and a second-stage alkaline washing tower for desulfurization, and H in the vent gas from a secondary alkaline washing tower is controlled2The S content is reduced to 10mg/m3The following; wherein, the alkaline washing liquid in the first-stage alkaline washing tower and the second-stage alkaline washing tower is sodium hydroxide solution, and the PH value in the first-stage alkaline washing tower and the second-stage alkaline washing tower is kept between 8.3 and 8.5;
(4) the vent gas from the secondary alkaline tower enters an active carbon adsorption tower for adsorption desulfurization, and H in the discharged vent gas is controlled2The S content is reduced to 1.0mg/m3And (5) emptying after reaching the standard.
CN202010028171.0A 2020-01-10 2020-01-10 Pressure swing adsorption decarbonization and vent gas desulfurization device and method Pending CN111167286A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113521985A (en) * 2021-08-17 2021-10-22 安徽金禾实业股份有限公司 Device and method for purifying and recycling vent gas in purification section

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103275777A (en) * 2013-06-08 2013-09-04 华电重工股份有限公司 Method for preparing hydrogen and liquefied natural gas through using gas retort raw gas
CN105505480A (en) * 2015-12-23 2016-04-20 四川中航超高分子量管业有限公司 Desulfurization purification system applicable to coke oven gas
US20170021301A1 (en) * 2015-07-24 2017-01-26 Air Products And Chemicals, Inc. Sour Pressure Swing Adsorption Process
CN107441901A (en) * 2017-09-07 2017-12-08 宁波顺泽橡胶有限公司 A kind of rubber production tail gas alkaline cleaning tower absorption technique
CN107585737A (en) * 2016-07-08 2018-01-16 王玲 A kind of syngas for synthetic ammonia sulfur method
CN110124445A (en) * 2019-05-13 2019-08-16 安徽华尔泰化工股份有限公司 A kind of PSA decarbonated exhaust gas sulfur removal technology

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103275777A (en) * 2013-06-08 2013-09-04 华电重工股份有限公司 Method for preparing hydrogen and liquefied natural gas through using gas retort raw gas
US20170021301A1 (en) * 2015-07-24 2017-01-26 Air Products And Chemicals, Inc. Sour Pressure Swing Adsorption Process
CN105505480A (en) * 2015-12-23 2016-04-20 四川中航超高分子量管业有限公司 Desulfurization purification system applicable to coke oven gas
CN107585737A (en) * 2016-07-08 2018-01-16 王玲 A kind of syngas for synthetic ammonia sulfur method
CN107441901A (en) * 2017-09-07 2017-12-08 宁波顺泽橡胶有限公司 A kind of rubber production tail gas alkaline cleaning tower absorption technique
CN110124445A (en) * 2019-05-13 2019-08-16 安徽华尔泰化工股份有限公司 A kind of PSA decarbonated exhaust gas sulfur removal technology

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113521985A (en) * 2021-08-17 2021-10-22 安徽金禾实业股份有限公司 Device and method for purifying and recycling vent gas in purification section

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Application publication date: 20200519