CN101502740B - Method for extracting concentrated methane from mash gas with middle concentration of methane by pressure varying adsorption technology - Google Patents
Method for extracting concentrated methane from mash gas with middle concentration of methane by pressure varying adsorption technology Download PDFInfo
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- CN101502740B CN101502740B CN 200910058352 CN200910058352A CN101502740B CN 101502740 B CN101502740 B CN 101502740B CN 200910058352 CN200910058352 CN 200910058352 CN 200910058352 A CN200910058352 A CN 200910058352A CN 101502740 B CN101502740 B CN 101502740B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001179 sorption measurement Methods 0.000 title claims description 32
- 238000005516 engineering process Methods 0.000 title claims description 5
- 238000010521 absorption reaction Methods 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 239000012141 concentrate Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims 1
- 238000005336 cracking Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 86
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000010926 purge Methods 0.000 abstract 2
- 239000002994 raw material Substances 0.000 description 9
- 238000009835 boiling Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000004480 active ingredient Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Landscapes
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a method for concentrating methane gas with low concentration, using the technique of series absorption. Gas mixture containing methane with concentration of 4-25% is referred to as feed gas, and the method for increasing the concentration of methane thereof to 30% at least and 100% at most is characterized by using the technique of pressure swing absorption gas separation and comprises the following steps: (1) the pressure of the feed gas is 0.02-0.4 MPa; the technique of multilevel pressure swing absorption is used for concentrating methane: on the first level, the concentration of gas methane at absorption exit is reduced to 20-70% of the concentration of raw gas methane; on the second level, the concentration of gas methane at absorption exit is reduced to less than 1%; (2) evacuated gas of the first level is taken as raw gas of the third level, therefore the concentration of methane in evacuated gas of the third level is increased to 30% at least and 100% at most; (3) evacuated gas of the second level is taken as raw gas of the first level; (4) gas of the third level at the absorption exit is the raw gas of the first level. The method used by gas, furnace gas, oven gas, cracked gas purge gas and other purge gases for separating methane can contribute to reducing cost.
Description
One, technical field
The present invention relates to the gas separation field, is a kind of method of using part component in the pressure swing adsorption separating gas mixture.
Two, background technology
Reclaim the technology of methane component for device in Gas, the usual method of using reclaims for deep cooling.Due to the huge equipment of needs and more operation energy consumption, therefore, industry is promoted because economic cause is more difficult.
Use light concentration gas as industrial chemicals, generally due to active ingredient, divide and force down, the reaction motive force is little, is unfavorable for the raising of utilization rate of equipment and installations, therefore, and must be by improving gas concentration or improving gas pressure and realize that the active ingredient dividing potential drop improves.The light concentration gas compression, certainly will consume a large amount of idle works, therefore, improves gas concentration, becomes an effective approach.
Pressure swing adsorption has application for concentrate methane technology in a lot of environments for use, still, due in actual applications, due to the explosion limit gas of gas separation process generation 5-25%, therefore, rare industrial applied research.
Three, summary of the invention
In order to improve methane concentration, the present invention utilizes the strategy of plural serial stage absorption, is used for improving gas reclaiming rate, avoids explosion gas directly to compress the danger of generation simultaneously.
In order to reduce energy consumption, can use lower adsorptive pressure.Before using pressure swing absorption process recovery low concentration available gas, must guarantee raw gas pressure 0.02～0.4MPa (table), through pretreatment, remove high boiling component.
To send into adsorption tower under lower pressure 0.02～0.4MPa containing methane 26-80% device in Gas, in first order adsorption tower, methane is adsorbed agent absorption, and lower first order absorption effluent gases is directly sent into second level adsorption tower than feed gas methane concentration; In the adsorption tower of the second level, methane is adsorbed agent absorption, and exhaust can be used as first order unstripped gas, and second level absorption effluent gases concentration is directly sent into waste gas system lower than 1%; The first order is found time gas as third level adsorption tower unstrpped gas, and methane is adsorbed agent absorption, and the exhaust bulk concentration directly brings up at least 95% maximum 100% as the output of finished product gas, and the absorption effluent gases can be used as first order unstripped gas;
The utilization desorption absorption tower of finding time.
Can use the find time non-methane gas of stripping gas backflow displacement sorption tower dead space of the corresponding levels or next stage, improve thus the adsorption tower methane concentration in stripping gas of finding time.
Like this, the gas methane concentration of finding time of the third level can reach 95～100%.
The pressure swing adsorption technique that the present invention is alleged can be that 2～12 adsorption towers form every one-level.
Four, the specific embodiment
Embodiment 1: certain device in Gas methane concentration 30%, and more than needing to improve methane concentration to 95%.
(1) be 0.12MPa (table) through being compressed to pressure, through preliminary clearning, remove the low-boiling composition of ratio methane in unstripped gas; (2) first order imported raw material gas methane concentration 30%, first order adsorption tower effluent gases methane concentration 15%, first order exhaust methane concentration 77%; Second level imported raw material gas is first order adsorption tower effluent gases, methane concentration 15%, and second level adsorption tower effluent gases methane concentration 0.2%, second level exhaust methane concentration 40% returns to the first order as unstripped gas; Third level imported raw material gas is first order adsorption tower exhaust, methane concentration 77%, and third level adsorption tower effluent gases methane concentration 28% returns to the first order as unstripped gas, and third level exhaust methane concentration 96% is exported as gas product.
Every grade all adopts 3 adsorption towers.
Embodiment 2: certain device in Gas methane concentration 60%, and more than needing to improve methane concentration to 99%.
(1) be 0.2MPa (table) through being compressed to pressure, through preliminary clearning, remove the low-boiling composition of ratio methane in unstripped gas; (2) first order imported raw material gas methane concentration 60%, first order adsorption tower effluent gases methane concentration 22%, first order exhaust methane concentration 88%; Second level imported raw material gas is first order adsorption tower effluent gases, methane concentration 22%, and second level adsorption tower effluent gases methane concentration 0.9%, second level exhaust methane concentration 54% returns to the first order as unstripped gas; Third level imported raw material gas is first order adsorption tower exhaust, methane concentration 88%, and third level adsorption tower effluent gases methane concentration 67%, third level exhaust methane concentration 99% is exported as gas product.
Every grade all adopts 4 adsorption towers.
Embodiment 3: certain device in Gas methane concentration 40%, and more than needing to improve concentration to 99%.
(1) be 0.4MPa (table) through being compressed to pressure, through preliminary clearning, remove the low-boiling composition of ratio methane in unstripped gas; (2) first order imported raw material gas methane concentration 40%, first order adsorption tower effluent gases methane concentration 4%, first order exhaust methane concentration 76%; Second level imported raw material gas is first order adsorption tower effluent gases, methane concentration 4%, and second level adsorption tower effluent gases methane concentration 0.1%, second level exhaust methane concentration 33% returns to the first order as unstripped gas; Third level imported raw material gas is first order adsorption tower exhaust, methane concentration 76%, and third level adsorption tower effluent gases methane concentration 43%, third level exhaust methane concentration 99% is exported as gas product.
Every grade all adopts 4 adsorption towers.
This patent reclaims methane through actual the use in device in Gas, and effect is fairly obvious, effectively reduces the energy consumption in the gas removal process, has saved cost.
Claims (1)
1. the technique of a pressure-changed adsorption concentrating methane, it is characterized in that, using and drop a hint as unstripped gas containing device in Gas, stove gas, oven gas, the cracking of methane constituent concentration 26～85%, use PSA Gas Separation Technology, methane concentration is brought up to at least 95% the highest 100% method, it comprises following steps: (1) raw gas pressure 0.02～0.4MPa, use stage variable pressure absorbing process concentrate methane: the first order, absorption exit gas methane concentration is reduced to 20～70% of feed gas methane concentration; The second level, absorption exit gas methane concentration is reduced to below 1%; (2) gas of finding time that uses the first order is as third level unstripped gas, improves thus methane concentration that the third level finds time in gas and reaches at least 95% the highest by 100%; (3) using the unstripped gas of gas as the first order of finding time of the second level; (4) third level absorption exit gas is as the unstripped gas of the first order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910058352 CN101502740B (en) | 2009-02-17 | 2009-02-17 | Method for extracting concentrated methane from mash gas with middle concentration of methane by pressure varying adsorption technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910058352 CN101502740B (en) | 2009-02-17 | 2009-02-17 | Method for extracting concentrated methane from mash gas with middle concentration of methane by pressure varying adsorption technology |
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| Publication Number | Publication Date |
|---|---|
| CN101502740A CN101502740A (en) | 2009-08-12 |
| CN101502740B true CN101502740B (en) | 2013-12-18 |
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| CN 200910058352 Expired - Fee Related CN101502740B (en) | 2009-02-17 | 2009-02-17 | Method for extracting concentrated methane from mash gas with middle concentration of methane by pressure varying adsorption technology |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284226A (en) * | 2010-06-18 | 2011-12-21 | 上海瑞气气体设备有限公司 | Pressure swing adsorption and copious cooling combined process for separating methane from low-concentration coalbed methane |
| CN102698563B (en) * | 2012-06-11 | 2014-07-09 | 四川亚连科技有限责任公司 | High purity and high recovery rate methane concentration production process and implementing device thereof |
| CN104436993A (en) * | 2014-11-27 | 2015-03-25 | 煤炭科学技术研究院有限公司 | Concentration separation method for methane in low-concentration gas |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1175474A (en) * | 1997-04-14 | 1998-03-11 | 成都华西化工研究所 | Multi-tower pressure swing adsorption method and apparatus for separation of gas |
| EP1867379A2 (en) * | 2006-06-13 | 2007-12-19 | Air Products and Chemicals, Inc. | Pressure swing adsorption process with improved recovery of high-purity product |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6576043B2 (en) * | 2001-10-12 | 2003-06-10 | Air Products And Chemicals, Inc. | Recovery of nitrogen and light hydrocarbons from polyalkene purge gas |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1175474A (en) * | 1997-04-14 | 1998-03-11 | 成都华西化工研究所 | Multi-tower pressure swing adsorption method and apparatus for separation of gas |
| EP1867379A2 (en) * | 2006-06-13 | 2007-12-19 | Air Products and Chemicals, Inc. | Pressure swing adsorption process with improved recovery of high-purity product |
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| CN101502740A (en) | 2009-08-12 |
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