CN105233623A - Novel technology of concentrating coal-mine low-concentration gas - Google Patents
Novel technology of concentrating coal-mine low-concentration gas Download PDFInfo
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- CN105233623A CN105233623A CN201510801927.XA CN201510801927A CN105233623A CN 105233623 A CN105233623 A CN 105233623A CN 201510801927 A CN201510801927 A CN 201510801927A CN 105233623 A CN105233623 A CN 105233623A
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Abstract
The invention discloses a novel technology of concentrating coal-mine low-concentration gas, and belongs to the technical field of gas separation. A novel pressure swing adsorption technology that feeding is conducted from a certain position in the middle of an adsorption tower, and weak adsorption light component gas back flow and strong adsorption heavy component gas back flow are adopted for the tower top and the tower bottom respectively is adopted. By means of the novel technology, methane in the coal-mine low-concentration gas can be directly concentrated from 3-10 vol% to over 60 vol% and from 20-30 vol% to over 90 vol%, the defects in an existing conventional pressure swing adsorption technology are effectively overcome, a multi-stage conventional pressure swing adsorption technology is not needed, and investment, operating cost and occupied space of a device are obviously reduced.
Description
Technical field
The present invention relates to the process of methane in a kind of concentrate coal mine light concentration mash gas, what be specifically related to be a kind of is the new technology that raw material carrys out concentrate methane with coal mine light concentration mash gas, belongs to gas separation technique field.
Background technology
Methane, as the green energy resource of clean and effective, plays important impetus in China's energy structure optimizing.Feature that China's primary energy structure has " the oil-poor weak breath of rich coal ", resource consumption (accounts for more than 70%) based on coal.With coal mining by a large amount of for by-product coal bed gas (being commonly called as gas), wherein buried depth 2000m is with shallow coal bed gas geological resources about 36.8 trillion m
3, suitable with conventional gas reserves.According to statistics, China's coal-mine gas pumping amount 17,000,000,000 m in 2014
3, wherein down-hole extraction 13,300,000,000 m
3, and in the gas of more than 70% down-hole extraction methane concentration lower than 30vol%, have even lower than 5vol%.Because methane concentration is low, utilize difficulty to cause greatly gas utilization rate only about 30%, a large amount of low concentration gas is directly emptying, causes the huge wasting of resources and environmental pollution.Comparatively outstanding for the Utilizing question of this low concentration gas at present, also very urgent to the demand of concentrate technology.If by the in addition enrichment of these emptying gas, concentrate, strong supplementing can will be formed to conventional gas.
For the concentrate of methane in low concentration gas, what possess commercial Application condition mainly contains pressure-variable adsorption, cold separation technology, wherein cryogenic separation due to complex process, equipment investment is large, energy consumption is high, there is no economic benefit, and the operating condition of pressure swing adsorption technique is gentle, technique is simple, it is little to invest, energy consumption is low, has now become most economical effective concentrate methane technology.Patent CN101732946A adopts and load explosion-suppressing material in pressure-changed adsorption concentrating methane device, solve the problem of plant running safety, the data wherein provided show the reduction with methane content in unstripped gas, in gas product, the content of methane and the rate of recovery all reduce, when in unstripped gas, methane content is 10vol%, in gas product, methane content only can reach 65vol%, and patent CN101096606, CN102728179A etc. also can only reach 60vol%.Patent 104436993A for adsorbent, adopts three grades of pressure-variable adsorptions that the concentration of methane in gas is increased to 80 ~ 90vol% by 5 ~ 20vol% in unstripped gas with BM-1 and BM-2 type carbon molecular sieve.Patent CN101502740, CN102380285A etc. disclose the technique adopting series connection absorption concentrate methane in gas, above pressure-swing absorption apparatus series connection is overlapped by two covers or two, using first set pressure-swing absorption apparatus absorption tail gas out as the unstripped gas of the second covering device, be communicated with in order successively, reduce the methane concentration in absorption tail gas.This process needs at least two cover pressure-swing absorption apparatus to run simultaneously, greatly adds equipment investment and operating cost undoubtedly.
The pressure swing adsorption technique adopted in above-mentioned patent is all conventional pressure swing adsorption technique, just technique has been done to the amendment of some novelties, has not had substantial technological break-through.The new technology that the present invention adopts is a kind of from adsorption tower certain position charging middle, at the bottom of tower top and tower, adopt light-component gas (weakly stable component) respectively, new pressure swing adsorption technique process that heavy constituent gas (strong absorbed component) refluxes, similar with rectification process principle, adopt this new technology can obtain light, the heavy constituent product of high concentration, and product recovery rate is high simultaneously.
Summary of the invention
The object of this invention is to provide a kind of concentrate coal mine light concentration mash gas new technology, methane (heavy constituent gas) in coal mine light concentration mash gas can be directly that the direct concentrate of 3 ~ 10vol% is to more than 60vol% from content by this new technology, from the direct concentrate of 20 ~ 30vol% to more than 90vol%, the deficiency of existing conventional pressure swing adsorption technique technology can also be efficiently solved.
For achieving the above object, the technical scheme taked of the present invention is as follows:
A kind of concentrate coal mine light concentration mash gas new technology, comprises following processing step:
Step 1: the first adsorption tower (1) is in low pressure feed/light component backflow adsorbed state, second adsorption tower (2) is in heavy constituent high pressure reflow adsorbed state, unstripped gas enters from the feed entrance point the first adsorption tower (1), first adsorption tower (1) bottom heavy constituent gas (high methane gas) out, gas product surge tank (4) is entered after compressor (3) compression, a part of gas product is exported, another part gas product is back to the second adsorption tower (2), second adsorption tower (2) top light component gas out (poor methane gas), a part exports as light component gas product, another part backflow enters the first adsorption tower (1),
Step 2: the first adsorption tower (1) and the second adsorption tower (2) are all pressed, the first adsorption tower (1) is equal voltage rise, and the second adsorption tower (2) is equal pressure drop;
Step 3: by the second adsorption tower (2) Pressure Drop to low pressure, the gas desorbed boosts to the first adsorption tower (1) after utilizing compressor (3) to compress;
Step 4: the first adsorption tower (1) is in heavy constituent high pressure reflow adsorbed state, second adsorption tower (2) is in low pressure feed/light component backflow adsorbed state, unstripped gas enters from the feed entrance point the second adsorption tower (2), second adsorption tower (2) bottom heavy constituent gas out, gas product surge tank (4) is entered after compressor (3) compression, a part of gas product is exported, another part gas product is back to the first adsorption tower (1), first adsorption tower (1) top light component gas out, a part exports as light component gas product, another part backflow enters the second adsorption tower (2),
Step 5: the first adsorption tower (1) and the second adsorption tower (2) are all pressed, the first adsorption tower (1) is equal pressure drop, and the second adsorption tower (2) is equal voltage rise;
Step 6: by the first adsorption tower (1) Pressure Drop to low pressure, the gas desorbed boosts to the second adsorption tower (2) after utilizing compressor (3) to compress.
The side tower body of adsorption tower is provided with at least 1 feed entrance point.
In described feed entrance point place adsorption tower, the methane content of gas is substantially equal with the methane content of unstripped gas.
In a cycle period, an adsorption tower is in low pressure, and another adsorption tower is then in high pressure accordingly.
Described low pressure is 0.1 ~ 0.4MPa.
Described high pressure is 0.2 ~ 0.8MPa.
Described adsorption temp is 0 ~ 40 DEG C.
For the concentrate of methane in coal mine light concentration mash gas, adopt novel pressure swing adsorption technique method of the present invention, have the following advantages: can be directly that the direct concentrate of 3 ~ 10vol% is to more than 60vol% by the methane (heavy constituent gas) in coal mine light concentration mash gas from content, and can also from the direct concentrate of 20 ~ 30vol% to more than 90vol%, do not need multistage conventional pressure swing adsorption technique, significantly reduce investment, operating cost and plant area.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
1. first adsorption towers, 2. the second adsorption tower in figure; 3. compressor; 4. surge tank.
Detailed description of the invention
Below by the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1
Shown in composition graphs 1, the coal mine gas being 3 ~ 10vol% with methane content is that unstripped gas carries out concentrate, and specific embodiment is as follows:
(1) unstripped gas feed entrance point of 30% height (in this position adsorption tower, the methane content of gas is substantially equal with the methane content of unstripped gas) at the bottom of distance tower from the first adsorption tower 1 enters, the adsorptive pressure of the first adsorption tower 1 is 0.2MPa, heavy constituent gas (high methane gas) out bottom first adsorption tower 1, be compressed to after 0.5MPa through compressor 3 and enter gas product surge tank 4, a part of gas product is exported, another part gas product is back to and drips two adsorption towers 2, the adsorptive pressure of the second adsorption tower 2 is 0.5MPa, adsorption tower 2 top light component gas out (poor methane gas), a part exports as light component gas product, another part backflow enters the first adsorption tower 1,
(2) when the methane content of heavy constituent gas product (high methane gas) is lower than 60vol%, stop into unstripped gas, the first adsorption tower 1 and the second adsorption tower 2 are all pressed, the first adsorption tower 1 is equal voltage rise, and the second adsorption tower 2 is equal pressure drop;
(3) after all pressure terminates, then by the second adsorption tower 2 Pressure Drop to 0.2MPa, after the gas desorbed utilizes compressor 3 to be compressed to 0.5MPa, the first adsorption tower 1 is boosted, make the pressure of the first adsorption tower 1 rise to 0.5MPa;
(4) after step 3 terminates, unstripped gas feed entrance point of 30% height (in this position adsorption tower, the methane content of gas is substantially equal with the methane content of unstripped gas) at the bottom of distance tower from the second adsorption tower 2 enters, the adsorptive pressure of adsorption tower 2 is 0.2MPa, heavy constituent gas (high methane gas) out bottom adsorption tower 2, be compressed to after 0.5MPa through compressor 3 and enter gas product surge tank 4, a part of gas product is exported, another part gas product is back to the first adsorption tower 1, the adsorptive pressure of the first adsorption tower 1 is 0.5MPa, first adsorption tower 1 top light component gas out (poor methane gas), a part exports as light component gas product, another part backflow enters the second adsorption tower 2,
(5) when the methane content of heavy constituent gas product (high methane gas) is lower than 60vol%, stop into unstripped gas, the first adsorption tower 1 and the second adsorption tower 2 are all pressed, the first adsorption tower 1 is equal pressure drop, and the second adsorption tower 2 is equal voltage rise;
(6) after all pressure terminates, then by the first adsorption tower 1 Pressure Drop to 0.2MPa, after the gas desorbed utilizes compressor 3 to be compressed to 0.5MPa, the second adsorption tower 2 is boosted, make the pressure of the second adsorption tower 2 rise to 0.5MPa.
Repeating above-mentioned 6 processing steps, can be that the direct concentrate of 3 ~ 10vol% is to more than 60vol% from content by the methane in coal mine gas.
Embodiment 2
Shown in composition graphs 1, the coal mine gas being 20 ~ 30vol% with methane content is that unstripped gas carries out concentrate, and specific embodiment is as follows:
(1) unstripped gas feed entrance point of 50% height (in this position adsorption tower, the methane content of gas is substantially equal with the methane content of unstripped gas) at the bottom of distance tower from the first adsorption tower 1 enters, the adsorptive pressure of the first adsorption tower 1 is 0.2MPa, heavy constituent gas (high methane gas) out bottom first adsorption tower 1, be compressed to after 0.6MPa through compressor 3 and enter gas product surge tank 4, a part of gas product is exported, another part gas product is back to adsorption tower 2, the adsorptive pressure of the second adsorption tower 2 is 0.6MPa, second adsorption tower 2 top light component gas out (poor methane gas), a part exports as light component gas product, another part backflow enters adsorption tower 1,
(2) when the methane content of heavy constituent gas product (high methane gas) is lower than 90vol%, stop into unstripped gas, the first adsorption tower 1 and the second adsorption tower 2 are all pressed, the first adsorption tower 1 is equal voltage rise, and the second adsorption tower 2 is equal pressure drop;
(3) after all pressure terminates, then by the second adsorption tower 2 Pressure Drop to 0.2MPa, after the gas desorbed utilizes compressor 3 to be compressed to 0.6MPa, the first adsorption tower 1 is boosted, make the pressure of the first adsorption tower 1 rise to 0.6MPa;
(4) after step 3 terminates, unstripped gas feed entrance point of 50% height (in this position adsorption tower, the methane content of gas is substantially equal with the methane content of unstripped gas) at the bottom of distance tower from the second adsorption tower 2 enters, the adsorptive pressure of the second adsorption tower 2 is 0.2MPa, heavy constituent gas (high methane gas) out bottom second adsorption tower 2, be compressed to after 0.6MPa through compressor 3 and enter gas product surge tank 4, a part of gas product is exported, another part gas product is back to the first adsorption tower 1, the adsorptive pressure of the first adsorption tower 1 is 0.6MPa, first adsorption tower 1 top light component gas out (poor methane gas), a part exports as light component gas product, another part backflow enters the second adsorption tower 2,
(5) when the methane content of heavy constituent gas product (high methane gas) is lower than 90vol%, stop into unstripped gas, the first adsorption tower 1 and the second adsorption tower 2 are all pressed, the first adsorption tower 1 is equal pressure drop, and the second adsorption tower 2 is equal voltage rise;
(6) after all pressure terminates, then by the first adsorption tower 1 Pressure Drop to 0.2MPa, after the gas desorbed utilizes compressor 3 to be compressed to 0.6MPa, the second adsorption tower 2 is boosted, make the pressure of the second adsorption tower 2 rise to 0.6MPa.
Repeating above-mentioned 6 processing steps, can be that the direct concentrate of 20 ~ 30vol% is to more than 90vol% from content by the methane in coal mine gas.
Claims (7)
1. a concentrate coal mine light concentration mash gas new technology, is characterized in that comprising following processing step:
Step 1: the first adsorption tower (1) is in low pressure feed/light component backflow adsorbed state, second adsorption tower (2) is in heavy constituent high pressure reflow adsorbed state, unstripped gas enters from the feed entrance point the first adsorption tower (1), first adsorption tower (1) bottom heavy constituent gas (high methane gas) out, gas product surge tank (4) is entered after compressor (3) compression, a part of gas product is exported, another part gas product is back to the second adsorption tower (2), second adsorption tower (2) top light component gas out (poor methane gas), a part exports as light component gas product, another part backflow enters the first adsorption tower (1),
Step 2: the first adsorption tower (1) and the second adsorption tower (2) are all pressed, the first adsorption tower (1) is equal voltage rise, and the second adsorption tower (2) is equal pressure drop;
Step 3: by the second adsorption tower (2) Pressure Drop to low pressure, the gas desorbed boosts to the first adsorption tower (1) after utilizing compressor (3) to compress;
Step 4: the first adsorption tower (1) is in heavy constituent high pressure reflow adsorbed state, second adsorption tower (2) is in low pressure feed/light component backflow adsorbed state, unstripped gas enters from the feed entrance point the second adsorption tower (2), second adsorption tower (2) bottom heavy constituent gas out, gas product surge tank (4) is entered after compressor (3) compression, a part of gas product is exported, another part gas product is back to the first adsorption tower (1), first adsorption tower (1) top light component gas out, a part exports as light component gas product, another part backflow enters the second adsorption tower (2),
Step 5: the first adsorption tower (1) and the second adsorption tower (2) are all pressed, the first adsorption tower (1) is equal pressure drop, and the second adsorption tower (2) is equal voltage rise;
Step 6: by the first adsorption tower (1) Pressure Drop to low pressure, the gas desorbed boosts to the second adsorption tower (2) after utilizing compressor (3) to compress.
2. concentrate coal mine light concentration mash gas new technology according to claim 1, the side tower body that it is characterized in that adsorption tower is provided with at least 1 feed entrance point.
3. concentrate coal mine light concentration mash gas new technology according to claim 1 and 2, is characterized in that the methane content of gas in described feed entrance point place adsorption tower is substantially equal with the methane content of unstripped gas.
4. concentrate coal mine light concentration mash gas new technology according to claim 1, is characterized in that, in a cycle period, an adsorption tower is in low pressure, and another adsorption tower is then in high pressure accordingly.
5. concentrate coal mine light concentration mash gas new technology according to claim 1, is characterized in that low pressure is 0.1 ~ 0.4MPa.
6. concentrate coal mine light concentration mash gas new technology according to claim 1, is characterized in that high pressure is 0.2 ~ 0.8MPa.
7. concentrate coal mine light concentration mash gas new technology according to claim 1, is characterized in that adsorption temp is 0 ~ 40 DEG C.
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| CN201510801927.XA CN105233623A (en) | 2015-11-19 | 2015-11-19 | Novel technology of concentrating coal-mine low-concentration gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114191939A (en) * | 2020-09-02 | 2022-03-18 | 中国科学院理化技术研究所 | Methane and nitrogen mixture separation system and separation process |
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| CN1061161A (en) * | 1990-10-25 | 1992-05-20 | 联合碳化工业气体技术公司 | Duplex adsorption process |
| CN103585856A (en) * | 2013-11-11 | 2014-02-19 | 天津大学 | Multi-backflow pressure swing adsorption method |
| CN103695063A (en) * | 2013-12-25 | 2014-04-02 | 四川省达科特能源科技有限公司 | Method for concentrating low-concentration methane gas |
-
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- 2015-11-19 CN CN201510801927.XA patent/CN105233623A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061161A (en) * | 1990-10-25 | 1992-05-20 | 联合碳化工业气体技术公司 | Duplex adsorption process |
| CN103585856A (en) * | 2013-11-11 | 2014-02-19 | 天津大学 | Multi-backflow pressure swing adsorption method |
| CN103695063A (en) * | 2013-12-25 | 2014-04-02 | 四川省达科特能源科技有限公司 | Method for concentrating low-concentration methane gas |
Non-Patent Citations (4)
| Title |
|---|
| THOMAS L.SALEMAN ET AL: "Capture of low grade methane from nitrogen gas using dual-reflux pressure swing adsorption", 《CHEMICAL ENGINEERING JOURNAL》 * |
| TUSHAR S.BHATT ET AL: "Experimental and Modeling Analysis of Dual-Reflux Pressure Swing Adsorption Process", 《INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH》 * |
| YECHUN ZHANG ET AL: "A Numerical Modelling Approach for Dual Reflux PSA Separation of N2 and CH4 in LNG Production", 《COMPUTER AIDED CHEMICAL ENGINEERING 》 * |
| 鲁东东 等: "双回流真空变压吸附空分模拟", 《现代化工》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114191939A (en) * | 2020-09-02 | 2022-03-18 | 中国科学院理化技术研究所 | Methane and nitrogen mixture separation system and separation process |
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Application publication date: 20160113 |