CN112892146A - Method and system for separating hydrogen sulfide from industrial tail gas - Google Patents
Method and system for separating hydrogen sulfide from industrial tail gas Download PDFInfo
- Publication number
- CN112892146A CN112892146A CN202110100614.7A CN202110100614A CN112892146A CN 112892146 A CN112892146 A CN 112892146A CN 202110100614 A CN202110100614 A CN 202110100614A CN 112892146 A CN112892146 A CN 112892146A
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- Prior art keywords
- tail gas
- hydrogen sulfide
- gas
- industrial tail
- industrial
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- 239000007789 gas Substances 0.000 title claims abstract description 125
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000009835 boiling Methods 0.000 claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000002826 coolant Substances 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000012071 phase Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 2
- 239000012267 brine Substances 0.000 claims description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011268 retreatment Methods 0.000 description 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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
- B01D53/002—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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention relates to the technical field of environmental protection, in particular to a method and a system for separating hydrogen sulfide from industrial tail gas; the method comprises the following steps: (1) carrying out primary cooling on the industrial tail gas to obtain primary cooled tail gas with the temperature of less than or equal to 10 ℃; (2) carrying out secondary cooling on the primary cooling tail gas to obtain cryogenic tail gas with the temperature of less than or equal to-75 ℃; (3) carrying out gas-liquid separation on the cryogenic tail gas, and collecting liquid; the content of hydrogen sulfide in the industrial tail gas is more than or equal to 1 percent, and the boiling point difference value between the hydrogen sulfide and other substance components in the industrial tail gas is more than or equal to 20 ℃; the method can effectively separate the hydrogen sulfide from the industrial tail gas, and has the advantages of green and environment-friendly process, energy conservation, simplicity and convenience, and good economic benefit.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method and a system for separating hydrogen sulfide from industrial tail gas.
Background
The hydrogen sulfide gas in the tail gas discharged by industrial activities not only corrodes equipment and reduces the operating conditions, but also causes environmental pollution and environmental protection pressure. At present, the removal methods related to hydrogen sulfide are mainly classified into two methods, adsorption and oxidation. The adsorption method adopts physical or chemical materials to absorb hydrogen sulfide, so that the hydrogen sulfide in the tail gas is adsorbed and recovered by an adsorbent or adsorption equipment. The oxidation process refers to a process for oxidizing hydrogen sulfide gas to elemental sulfur or a sulfur-containing oxide in a gas phase or a liquid phase. The two methods have the following defects: after hydrogen sulfide in the industrial tail gas is absorbed or oxidized, byproducts or waste can be generated, the byproducts need to be subjected to secondary treatment, the waste has the problem of environmental pollution, and the problem of high operation cost exists in the retreatment process.
Disclosure of Invention
The invention aims to provide a method for separating hydrogen sulfide from industrial tail gas, which comprises the following steps:
(1) carrying out primary cooling on the industrial tail gas to obtain primary cooled tail gas with the temperature of less than or equal to 10 ℃;
(2) carrying out secondary cooling on the primary cooling tail gas to obtain cryogenic tail gas with the temperature of less than or equal to-75 ℃;
(3) carrying out gas-liquid separation on the cryogenic tail gas, and collecting liquid;
the content of hydrogen sulfide in the industrial tail gas is more than or equal to 1 percent, and the boiling point difference between the hydrogen sulfide and other substance components in the industrial tail gas is more than or equal to 20 ℃.
According to the preferable technical scheme, the primary cooling medium is circulating water or frozen brine, and the primary cooling equipment is a tube type heat exchanger.
According to the preferable technical scheme, the secondary cooling medium is liquid ammonia or liquid nitrogen, and the secondary cooling equipment is a main heat exchanger.
According to the preferable technical scheme, in the step (3), the discharged gas is reused for secondary cooling of the primary cooling tail gas, and is discharged after heat exchange.
According to the preferable technical scheme of the invention, the discharged gas is discharged after being absorbed by physical or chemical materials.
The invention also aims to provide a separation system of hydrogen sulfide in industrial tail gas, which comprises a primary cooling unit, a secondary cooling unit, a gas-liquid separator and a liquid storage unit, wherein the industrial tail gas is communicated with a first tail gas inlet of the primary cooling unit from the outside through a pipeline, a second tail gas inlet and a second tail gas outlet of the secondary cooling unit are respectively connected with a first tail gas outlet of the primary cooling unit and an inlet of the gas-liquid separator, a liquid phase outlet of the gas-liquid separator is communicated into the liquid storage unit, the content of hydrogen sulfide in the industrial tail gas is more than or equal to 1 percent, and the boiling point difference value of hydrogen sulfide and other substance components in the industrial tail gas is more than or equal to 20.
According to the preferable technical scheme, the primary cooling unit is a tube type heat exchanger and comprises a first cold source inlet and a first cold source outlet which are communicated with a shell pass, and the first tail gas inlet and the first tail gas outlet are communicated with the tube pass.
According to the preferable technical scheme, the secondary cooling unit is a main heat exchanger and comprises a second tail gas inlet, a second tail gas outlet, a second cold source inlet, a second cold source outlet, a backflow gas inlet and a backflow gas outlet.
According to the preferable technical scheme, a gas-phase outlet of the gas-liquid separator is communicated with a return gas inlet of the secondary cooling unit.
The preferable technical scheme of the invention also comprises an absorption unit, and a return gas outlet of the secondary cooling unit is communicated with the absorption unit.
Compared with the prior art, the invention has the following beneficial technical effects: the method can effectively separate the hydrogen sulfide from the industrial tail gas, and has the advantages of green and environment-friendly process, energy conservation, simplicity and convenience, and good economic benefit.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Industrial tail gas generated by producing CIGS thin film solar energy is collected from a Kaishan photovoltaic material company Limited production workshop, and the main components in the industrial tail gas are as follows through detection: 98.32 percent of nitrogen (with the boiling point of-196 ℃) and 1.68 percent of hydrogen sulfide (with the boiling point of-60.4 ℃); temperature of industrial tail gas: 40-60 ℃; industrial tail gas pressure: -400 pa; flow rate of industrial tail gas: 768.932m3/h。
Example 1
Referring to fig. 1, a separation system for hydrogen sulfide in industrial tail gas includes a primary cooling unit 10, a secondary cooling unit 20, a gas-liquid separator 30, a liquid storage unit 40, and an absorption unit 50.
The primary cooling unit 10 is used for primarily cooling the industrial exhaust gas, and includes a first exhaust gas inlet 11, a first exhaust gas outlet 12, a first cold source inlet 13, and a first cold source outlet 14. Specifically, the primary cooling unit 10 may be a tubular heat exchanger, and thus the first exhaust gas inlet 11 and the first exhaust gas outlet 12 may be communicated with a tube side of the tubular heat exchanger, and the first cold source inlet 13 and the first cold source outlet 14 may be communicated with and with a shell side of the tubular heat exchanger, so that the first cold source and the industrial exhaust gas perform heat exchange in the tubular heat exchanger.
The secondary cooling unit 20 is used for deeply cooling the industrial exhaust gas, and includes a second exhaust gas inlet 21, a second exhaust gas outlet 22, a second cold source inlet 23, a second cold source outlet 24, a return gas inlet 25, and a return gas outlet 26. Specifically, the secondary cooling unit 20 may be a main heat exchanger. The main heat exchanger is used for exchanging the positive flow air and the return flow air by recovering the cold energy of the product gas in the air separation equipment. In the invention, the main heat exchanger has the function of heat exchange between the return gas and the industrial tail gas by the second cold source, and the consumption of the second cold source is saved by recovering cold energy, thereby reducing the cooling cost.
The gas-liquid separator 30 is used for performing gas-liquid separation on the deeply cooled industrial tail gas.
The liquid storage unit 40 is a storage tank for collecting and storing hydrogen sulfide liquid.
The absorption unit 50 is a container containing a hydrogen sulfide absorbent for absorbing hydrogen sulfide remaining in the exhaust gas. The hydrogen sulfide absorbent may be sodium hydroxide solution, soda lime, or the like.
The connection relationship of the separation system is as follows: the industrial tail gas is communicated with a first tail gas inlet 11 of the primary cooling unit 10 through a pipeline, a second tail gas inlet 21 and a second tail gas outlet 22 of the secondary cooling unit 20 are respectively connected with a first tail gas outlet 12 of the primary cooling unit 10 and an inlet 31 of the gas-liquid separator 30, a liquid phase outlet 32 of the gas-liquid separator 30 leads to the liquid storage unit 40, a gas phase outlet 33 of the gas-liquid separator 30 leads to a return gas inlet 25 of the secondary cooling unit 20, and a return gas outlet 26 of the secondary cooling unit 20 is communicated with the absorption unit 50.
The separation system described in this example was used to separate hydrogen sulfide from the industrial tail gas of example 2.
Example 2
A method for separating hydrogen sulfide from industrial tail gas comprises the following steps:
(1) using circulating water as a cold source, performing primary cooling on the industrial tail gas by using a primary cooling unit 10 to obtain primary cooled tail gas with the temperature of 0-10 ℃, and feeding the primary cooled tail gas into a secondary cooling unit 20;
(2) using liquid nitrogen as a cold source, performing secondary cooling on the primary cold tail gas by using a secondary cooling unit 20 to obtain cryogenic tail gas with the temperature of minus 80 ℃ to minus 75 ℃, and feeding the cryogenic tail gas into a gas-liquid separator 30;
(3) and (3) carrying out gas-liquid separation on the cryogenic tail gas by using a gas-liquid separator 30, wherein liquid is led into the liquid storage unit 40, gas is led into the secondary cooling unit 20, is heated to 5-10 ℃ by heat exchange, and is discharged after being treated by the absorption unit 50.
Through detection, the content of hydrogen sulfide in the liquid storage unit 40 is 99.92%, and after the hydrogen sulfide is treated by the absorption unit 50, the content of hydrogen sulfide in the discharged gas is 13mg/m3And the requirement of tail gas emission is met.
The above description of the specific embodiments of the present invention is not intended to limit the present invention, and those skilled in the art may make various changes and modifications according to the present invention without departing from the spirit of the present invention, which is defined in the appended claims.
Claims (10)
1. A method for separating hydrogen sulfide from industrial tail gas is characterized by comprising the following steps:
(1) carrying out primary cooling on the industrial tail gas to obtain primary cooled tail gas with the temperature of less than or equal to 10 ℃;
(2) carrying out secondary cooling on the primary cooling tail gas to obtain cryogenic tail gas with the temperature of less than or equal to-75 ℃;
(3) carrying out gas-liquid separation on the cryogenic tail gas, and collecting liquid;
the content of hydrogen sulfide in the industrial tail gas is more than or equal to 1 percent, and the boiling point difference between the hydrogen sulfide and other substance components in the industrial tail gas is more than or equal to 20 ℃.
2. The method for separating hydrogen sulfide from industrial tail gas according to claim 1, characterized in that: the primary cooling medium is circulating water or frozen brine, and the primary cooling equipment is a tube type heat exchanger.
3. The method for separating hydrogen sulfide from industrial tail gas according to claim 1, characterized in that: the secondary cooling medium is liquid ammonia or liquid nitrogen, and the secondary cooling equipment is a main heat exchanger.
4. The method for separating hydrogen sulfide from industrial tail gas according to claim 1, characterized in that: and (3) in the step (3), the discharged gas is reused for carrying out secondary cooling on the primary cooling tail gas, and is discharged after heat exchange.
5. The method for separating hydrogen sulfide from industrial tail gas according to claim 4, characterized in that: the discharged gas is discharged after being absorbed by physical or chemical materials.
6. A separation system of hydrogen sulfide in industrial tail gas is characterized in that: the industrial tail gas cooling system comprises a primary cooling unit (10), a secondary cooling unit (20), a gas-liquid separator (30) and a liquid storage unit (40), wherein the industrial tail gas is communicated with a first tail gas inlet (11) of the primary cooling unit (10) through a pipeline from the outside, a second tail gas inlet (21) and a second tail gas outlet (22) of the secondary cooling unit (20) are respectively connected with a first tail gas outlet (12) of the primary cooling unit (10) and an inlet (31) of the gas-liquid separator (30), a liquid phase outlet (32) of the gas-liquid separator (30) leads into the liquid storage unit (40), the content of hydrogen sulfide in the industrial tail gas is more than or equal to 1%, and the boiling point difference value of the hydrogen sulfide and other substance components in the industrial tail gas is more.
7. The system for separating hydrogen sulfide from industrial tail gas according to claim 6, characterized in that: the primary cooling unit (10) is a tube type heat exchanger and comprises a first cold source inlet (13) and a first cold source outlet (14) which are communicated with a shell pass, and a first tail gas inlet (11) and a first tail gas outlet (12) are communicated with the tube pass.
8. The system for separating hydrogen sulfide from industrial tail gas according to claim 6, characterized in that: the secondary cooling unit (20) is a main heat exchanger and comprises a second tail gas inlet (21), a second tail gas outlet (22), a second cold source inlet (23), a second cold source outlet (24), a backflow gas inlet (25) and a backflow gas outlet (26).
9. The system for separating hydrogen sulfide from industrial tail gas according to claim 8, characterized in that: the gas phase outlet (33) of the gas-liquid separator (30) leads to the return gas inlet (25) of the secondary cooling unit (20).
10. The system for separating hydrogen sulfide from industrial tail gas according to claim 8, characterized in that: the device also comprises an absorption unit (50), and a return gas outlet (26) of the secondary cooling unit (20) is communicated with the absorption unit (50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110100614.7A CN112892146A (en) | 2021-01-26 | 2021-01-26 | Method and system for separating hydrogen sulfide from industrial tail gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110100614.7A CN112892146A (en) | 2021-01-26 | 2021-01-26 | Method and system for separating hydrogen sulfide from industrial tail gas |
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| CN112892146A true CN112892146A (en) | 2021-06-04 |
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| CN202110100614.7A Pending CN112892146A (en) | 2021-01-26 | 2021-01-26 | Method and system for separating hydrogen sulfide from industrial tail gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417183A (en) * | 2011-08-31 | 2012-04-18 | 上海优华系统集成技术有限公司 | Improved recovery condensation system for tail gas in preparation of polysilicon |
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| CN104941383A (en) * | 2015-06-16 | 2015-09-30 | 浙江省天正设计工程有限公司 | Method and device for recycling methane chloride tail gas in depth |
| CN205710634U (en) * | 2016-04-29 | 2016-11-23 | 神雾环保技术股份有限公司 | A kind of decarbonization desulfurization system of synthetic natural gas |
| CN106268162A (en) * | 2015-06-12 | 2017-01-04 | 新特能源股份有限公司 | A kind of exhaust gas recovery system |
| WO2018132339A1 (en) * | 2017-01-10 | 2018-07-19 | Cameron Solutions, Inc. | Carbon dioxide and hydrogen sulfide recovery system using a combination of membranes and low temperature cryogenic separation processes |
| CN110143571A (en) * | 2019-06-21 | 2019-08-20 | 山东三维石化工程股份有限公司 | The apparatus and method of the hydrogen manufacturing of environment-friendly type hydrogen sulfide and insoluble sulfur |
-
2021
- 2021-01-26 CN CN202110100614.7A patent/CN112892146A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417183A (en) * | 2011-08-31 | 2012-04-18 | 上海优华系统集成技术有限公司 | Improved recovery condensation system for tail gas in preparation of polysilicon |
| CN104437004A (en) * | 2014-11-25 | 2015-03-25 | 赛鼎工程有限公司 | Method suitable for controlling concentration of hydrogen sulfide tail gas in low-temperature methanol washing process |
| CN106268162A (en) * | 2015-06-12 | 2017-01-04 | 新特能源股份有限公司 | A kind of exhaust gas recovery system |
| CN104941383A (en) * | 2015-06-16 | 2015-09-30 | 浙江省天正设计工程有限公司 | Method and device for recycling methane chloride tail gas in depth |
| CN205710634U (en) * | 2016-04-29 | 2016-11-23 | 神雾环保技术股份有限公司 | A kind of decarbonization desulfurization system of synthetic natural gas |
| WO2018132339A1 (en) * | 2017-01-10 | 2018-07-19 | Cameron Solutions, Inc. | Carbon dioxide and hydrogen sulfide recovery system using a combination of membranes and low temperature cryogenic separation processes |
| CN110143571A (en) * | 2019-06-21 | 2019-08-20 | 山东三维石化工程股份有限公司 | The apparatus and method of the hydrogen manufacturing of environment-friendly type hydrogen sulfide and insoluble sulfur |
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