CN101096908B - Two stage low pressure method for coal bed gas producing natural gas - Google Patents
Two stage low pressure method for coal bed gas producing natural gas Download PDFInfo
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- CN101096908B CN101096908B CN2006100281782A CN200610028178A CN101096908B CN 101096908 B CN101096908 B CN 101096908B CN 2006100281782 A CN2006100281782 A CN 2006100281782A CN 200610028178 A CN200610028178 A CN 200610028178A CN 101096908 B CN101096908 B CN 101096908B
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- pressure
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- 239000007789 gas Substances 0.000 title claims abstract description 176
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000003245 coal Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000003345 natural gas Substances 0.000 title claims abstract description 39
- 238000010521 absorption reaction Methods 0.000 claims abstract description 32
- 239000013067 intermediate product Substances 0.000 claims abstract description 25
- 230000008929 regeneration Effects 0.000 claims abstract description 18
- 238000011069 regeneration method Methods 0.000 claims abstract description 18
- 238000011084 recovery Methods 0.000 claims abstract description 17
- 239000000047 product Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000001179 sorption measurement Methods 0.000 claims description 117
- 238000005516 engineering process Methods 0.000 claims description 27
- 239000003463 adsorbent Substances 0.000 claims description 21
- 238000006073 displacement reaction Methods 0.000 claims description 21
- 241000282326 Felis catus Species 0.000 claims description 14
- 239000000470 constituent Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000002808 molecular sieve Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000012141 concentrate Substances 0.000 abstract 2
- 239000002594 sorbent Substances 0.000 abstract 1
- 238000003825 pressing Methods 0.000 description 4
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a method for producing natural gas from coal bed gas with a two-stage low pressure method capable of concentrating the coal bed gas with extremely low CH4 content at a low pressure to the natural gas concentration, namely over 99%, and keeping an extremely high CH4 recovery, which is characterized by the following: adopting two-stage low pressure CH4 gas absorption and concentration series cycle of operation; loading 2-3 species high effective CH4 gas sorbent in an absorption tower at each concentration stage; concentrating CH4 gas at a low pressure less than 0.05MPa. G, and adopting vacuum regeneration mode to obtain the CH4 gas with high concentration. The two-stage structure comprises: 1) obtaining the CH4 gas product with high concentration through absorption and concentration and vacuum regeneration technique in the former stage, at the same time further purifiying vent gas of the former stage as raw material gas for the rear stage, obtaining the CH4 with higher concentration after concentration at the rear stage, then returning to the former stage as raw material gas for the former stage to recycle and concentrate; 2) obtaining CH4 gas intermediate product with relative higher concentration through absorption and concentration and vacuum regeneration technique at the former stage as raw material gas for the rear stage, further concentrating, the vent gas at the rear stage returning to the former stage to continue to concentrate.
Description
Technical field
The present invention relates to the method for a kind of two stage low pressure method coal bed gas producing natural gas (high concentration methane).
Technical background
At present, in disclosed at home and abroad patent documentation or the report technical data, still not having any technology can reach: under less than the low pressure of 0.05MPa.G with CH
4Concentration be lower than 50% in addition be low to moderate 10% coal bed gas carry dense to methane content greater than the natural gas more than 90%, reach the methane recovery index more than 95% simultaneously.
China is coal production big country, and a large amount of by-product coal bed gas is arranged in coal production, wherein most CH
4Content all is lower than 50%, have in addition be low to moderate 10%, this part Device in Gas is because CH
4Gas concentration is low, and therefore the oxygen content height is difficult to direct utilization, all directly emptying of major part usually.This has not only caused the waste of a large amount of energy, and because CH
4Gas is a kind of strong greenhouse gas, therefore also causes serious environmental issue.And the huge and resource wretched insufficiency of the Natural Gas Demand amount of China needs a large amount of imports, produces the natural gas technology so press for a kind of efficient, safe coal bed gas.For improving this The Application of Technology scope and efficient, this technology also must have can adapt to low CH simultaneously
4Gas concentration coal bed gas (CH
4Gas content can be lower than 10%) condition and high CH
4The characteristics of gas recovery rate.
Summary of the invention
The objective of the invention is, provide a kind of two stage low pressure method coal bed gas producing natural gas method, can realize extremely to hang down CH for solving an above-mentioned difficult problem
4The coal bed gas of gas content (can be lower than 10%) is carried dense to concentration of natural gas, keeps high CH simultaneously
4Gas recovery rate.
The present invention adopts two sections low pressure CH
4Aspiration is attached proposes the series circulation operation of dense workshop section, and the work relationship between two workshop sections has two kinds of patterns:
First kind: a kind of two stage low pressure method coal bed gas producing natural gas method, by two low pressure CH
4The attached dense workshop section series circulation of carrying of aspiration forms; Each CH
4Gas is carried dense workshop section all has 2～6 to be filled with 2-3 kind CH
4The adsorption tower of adsorbent; Preceding workshop section and back workshop section all adopt following vacuum regeneration technology:
From the coal bed gas of coal bed gas extracting device, temperature is a normal temperature, and pressure at first enters the adsorption tower of preceding workshop section, CH in preceding workshop section adsorption tower less than 0.05MPa.G
4Under the selection absorption of gas adsorbent, the H in the coal bed gas
2O and CH
4Be adsorbed agent and absorb etc. component, the constituent of air that is not adsorbed then flows out from cat head, the dropping a hint of workshop section before being called, and dropping a hint of preceding workshop section will be proceeded CH as the unstripped gas of back workshop section
4The recovery of gas is carried dense;
Then preceding workshop section adsorption tower is vacuumized, make the CH in workshop section's adsorption tower before being attracted to
4Gas is born again, thereby obtains CH
4Gas purity is greater than 90% gas product;
Then former the dropping a hint of workshop section of back workshop section is unstripped gas, is to utilize the CH that loads in the back workshop section adsorption tower equally
4CH during the gas adsorbent is dropped a hint preceding workshop section earlier
4Aspiration is attached to get off, and vacuumizes acquisition concentration then and has improved 2～3 times intermediate products gas; The unstripped gas of workshop section inlet house steward before this intermediate products gas returns again mixes back circulation carrying out CH with the raw material coal bed gas of preceding workshop section
4The recovery of gas is carried dense, forms juice circulation between two workshop sections.
The specific embodiment of each adsorption tower all as mentioned above, the above operation that hockets of 2-6 adsorption tower can obtain continuous high concentration CH
4The natural gas product.
Second kind: a kind of two stage low pressure method coal bed gas producing natural gas method, by two low pressure CH
4The attached dense workshop section series circulation of carrying of aspiration forms; Each CH
4Gas is carried dense workshop section all has 2～6 to be filled with 2-3 kind CH
4The adsorption tower of gas adsorbent; Preceding workshop section and back workshop section all adopt following vacuum regeneration technology:
From the coal bed gas of coal bed gas extracting device, temperature is a normal temperature, and pressure at first enters the adsorption tower of preceding workshop section, CH in preceding workshop section adsorption tower less than 0.05MPa.G
4Under the selection absorption of gas adsorbent, the H in the coal bed gas
2O and CH
4Be adsorbed agent and absorb etc. component, the constituent of air that is not adsorbed then flows out from cat head, and workshop section drops a hint the direct emptying of dropping a hint of preceding workshop section before being called;
Then preceding workshop section adsorption tower is vacuumized, make the CH of absorption
4Gas is born again, thereby obtains CH
4Gas purity is greater than 50% intermediate products gas;
The back workshop section then intermediate products gas of former workshop section is a unstripped gas, is equally to utilize the CH that loads in the back workshop section adsorption tower
4CH during adsorbent is dropped a hint preceding workshop section earlier
4Aspiration is attached to get off, and vacuumizes to obtain concentration greater than 90% product natural gas; Workshop section's unstripped gas inlet house steward before the dropping a hint of back workshop section then loops back and carries out CH after the raw material coal bed gas of preceding workshop section is mixed once more
4The recovery of gas is carried dense, forms juice circulation between two workshop sections;
The specific embodiment of each adsorption tower all as mentioned above, the above operation that hockets of 2-6 adsorption tower can obtain continuous high concentration CH
4The natural gas product.
A kind of two stage low pressure method coal bed gas producing natural gas method of the present invention, can be under low pressure with the CH of low concentration very in the coal bed gas
4Gas is carried dense to concentration of natural gas, CH
4Gas concentration reaches more than 99%, and two sections low pressure absorption vacuum regeneration juice circulation technology of the present invention can obtain high CH
4Gas recovery rate.
Description of drawings
Accompanying drawing 1 is a first method process chart of the present invention.
Accompanying drawing 2 is second method process charts of the present invention.
1 adsorption tower, 2 adsorption towers, 3 former glassware surge tanks, 4 vacuum pumps, 5 natural gas surge tanks, 6 drop a hint surge tank, 7 intermediate products surge tanks.
Specific embodiment
The present invention has two kinds of methods:
Embodiment 1, sees accompanying drawing 1:
First kind of two stage low pressure method coal bed gas producing natural gas method is by two low pressure CH
4The attached dense workshop section series circulation of carrying of aspiration forms; Before workshop section output product natural gas, back workshop section carries intermediate products after dense and returns preceding workshop section and make unstripped gas.
Each CH of this method
4Gas is carried dense workshop section and is filled with 2-3 kind CH by 2
4The adsorption tower of gas adsorbent, surge tank, vacuum pump and some sequencing valves that is used for switching controls are formed.Preceding workshop section has former glassware surge tank 3, vacuum pump 4, natural gas surge tank 5, the surge tank 6 of dropping a hint; Back workshop section has vacuum pump 4, intermediate products surge tank 7.Adsorbent in the adsorption tower is silica type, activated carbon class or molecular sieve adsorbent.Specific as follows:
A kind of two stage low pressure method coal bed gas producing natural gas method, preceding workshop section and back workshop section all adopt following vacuum regeneration technology:
From the coal bed gas of coal bed gas extracting device (being generally water-ring vacuum pump), temperature is a normal temperature, and pressure at first enters the adsorption tower of preceding workshop section, multiple CH in preceding workshop section adsorption tower less than 0.05MPa.G
4Under the selection absorption of gas adsorbent, the H in the coal bed gas
2O and CH
4Be adsorbed agent and absorb etc. component, after adsorption process finishes, carry out drop pressure technology: make the adsorption tower and the connection of another adsorption tower that is in vacuum pressure condition that are in elevated pressures, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other lower pressure adsorption tower of having finished regeneration; The constituent of air that is not adsorbed then flows out from the absorption cat head; Replace extracting and concentrating technology again: be used for high concentration CH in product natural gas surge tank
4Gas is replaced adsorption tower along the absorption direction of adsorption tower, and the air displacement in the adsorption tower dead space is gone out;
The constituent of air that is not adsorbed then flows out from cat head, is called dropping a hint of preceding workshop section, and dropping a hint of preceding workshop section will be proceeded CH as the unstripped gas of back workshop section
4The recovery of gas is carried dense.
CH before being attracted in workshop section's adsorption tower
4Gas is by all pressing, make after the technology such as displacement the CH in the tower
4Gas concentration is brought up to more than 90%, with vacuum pump preceding workshop section adsorption tower is vacuumized then, makes the CH of absorption
4Gas is born again, thereby obtains CH
4Gas purity is greater than 90% gas product.
Then former the dropping a hint of workshop section of back workshop section is unstripped gas, is to utilize the CH that loads in the back workshop section adsorption tower equally
4CH during the gas adsorbent is dropped a hint preceding workshop section earlier
4Aspiration is attached to get off, and then by technologies such as all pressing, replace, vacuumize, obtains concentration from vacuum pump outlet and improved 2～3 times intermediate products gas, for improving CH
4The unstripped gas of workshop section inlet house steward before the rate of recovery of gas, this intermediate products gas are returned again mixes back circulation carrying out CH with the raw material coal bed gas of preceding workshop section
4The recovery of gas is carried dense.Drop pressure technology: after adsorption process finishes, the adsorption tower and another adsorption tower that is in vacuum pressure condition that are in elevated pressures are connected, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other lower pressure adsorption tower of having finished regeneration; The constituent of air that is not adsorbed then flows out from the absorption cat head; Back workshop section displacement extracting and concentrating technology: use from the high concentration CH in the intermediate products surge tank
4Gas is replaced adsorption tower along the absorption direction of adsorption tower, and the air displacement in the adsorption tower dead space is gone out.
The specific embodiment of each adsorption tower all as mentioned above, the above operation that hockets of two adsorption towers of forward and backward workshop section can obtain continuous high concentration CH
4Gas product.
Second kind of two stage low pressure method coal bed gas producing natural gas method is by two low pressure CH
4The attached dense workshop section series circulation of carrying of aspiration forms; Coal bed gas obtains intermediate products gas in the preliminary purification of preceding workshop section, serves as that the feedstock purification of back workshop section goes out natural gas with intermediate products gas again, and the dropping a hint of back workshop section returned preceding workshop section as unstripped gas.
Preceding workshop section adopts intermediate products surge tank 7, and other are with embodiment 1; Back workshop section adopts natural gas surge tank 5, and other together
Preceding workshop section and back workshop section all adopt following vacuum regeneration technology, and be specific as follows:
Second kind of two stage low pressure method coal bed gas producing natural gas method, from the coal bed gas of coal bed gas extracting device (being generally water-ring vacuum pump), temperature is a normal temperature, pressure at first enters the adsorption tower of preceding workshop section, multiple CH in preceding workshop section adsorption tower less than 0.05MPa.G
4Under the selection absorption of gas adsorbent, the H in the coal bed gas
2O and CH
4Be adsorbed agent and absorb etc. component, the constituent of air that is not adsorbed then flows out from cat head, and workshop section drops a hint the direct emptying of dropping a hint of preceding workshop section before being called.
CH before being attracted in workshop section's adsorption tower
4Gas by all press, technology such as displacement, drop pressure technology: after adsorption process finishes, make the adsorption tower and the connection of another adsorption tower that is in vacuum pressure condition that are in elevated pressures, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other lower pressure adsorption tower of having finished regeneration; The constituent of air that is not adsorbed then flows out from the absorption cat head; Replace extracting and concentrating technology again: use from the high concentration CH in the intermediate products surge tank
4Gas is replaced adsorption tower along the absorption direction of adsorption tower, and the air displacement in the adsorption tower dead space is gone out;
By all pressing, after the technology such as displacement, making the CH in the tower
4Gas concentration is brought up to more than 50%, with vacuum pump preceding workshop section adsorption tower is vacuumized then, makes the CH of absorption
4Gas is born again, thereby obtains CH
4Gas purity is greater than 50% intermediate products gas.
The back workshop section then intermediate products gas of former workshop section is a unstripped gas, is equally to utilize the CH that loads in the back workshop section adsorption tower
4The gas adsorbent is earlier with the CH in the intermediate products gas
4Aspiration is attached to get off, and then by the step preface such as all pressing, replace, vacuumize, and obtains concentration greater than 90% product natural gas from vacuum pump outlet, is to improve CH
4Workshop section's unstripped gas inlet house steward before the rate of recovery of gas, the dropping a hint of back workshop section then loop back and carries out CH after the raw material coal bed gas of preceding workshop section is mixed once more
4The recovery of gas is carried dense.
Drop pressure technology in the back workshop section: after adsorption process finishes, the adsorption tower and another adsorption tower that is in vacuum pressure condition that are in elevated pressures are connected, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other lower pressure adsorption tower of having finished regeneration; The constituent of air that is not adsorbed then flows out from the absorption cat head;
Back workshop section displacement extracting and concentrating technology: be used for high concentration CH in product natural gas surge tank
4Gas is replaced adsorption tower along the absorption direction of adsorption tower, and the air displacement in the adsorption tower dead space is gone out.
The specific embodiment of each adsorption tower all as mentioned above, the above operation that hockets of 2-6 adsorption tower can obtain continuous high concentration CH
4The natural gas product.
Two workshop sections circulation absorption purification design by such just can realize extremely hanging down CH
4The coal bed gas of gas content (can be lower than 10%) is carried dense to concentration of natural gas, keeps high CH simultaneously
4The purpose of gas recovery rate.
Claims (5)
1. a two stage low pressure method coal bed gas producing natural gas method is characterized in that, by two low pressure CH
4The attached dense workshop section series circulation of carrying of aspiration forms; Each CH
4Gas is carried dense workshop section all has 2～6 to be filled with 2-3 kind CH
4The adsorption tower of adsorbent; Preceding workshop section and back workshop section all adopt following vacuum regeneration technology:
From the coal bed gas of coal bed gas extracting device, temperature is a normal temperature, and pressure at first enters the adsorption tower of preceding workshop section, CH in preceding workshop section adsorption tower less than 0.05MPa.G
4Under the selection absorption of gas adsorbent, the H in the coal bed gas
2O and CH
4Component is adsorbed agent and absorbs, and the constituent of air that is not adsorbed then flows out from cat head, is called dropping a hint of preceding workshop section, and dropping a hint of preceding workshop section will be proceeded CH as the unstripped gas of back workshop section
4The recovery of gas is carried dense;
Then preceding workshop section adsorption tower is vacuumized, make the CH in workshop section's adsorption tower before being attracted to
4Gas is born again, thereby obtains CH
4Gas purity is greater than 90% gas product;
Then former the dropping a hint of workshop section of back workshop section is unstripped gas, is to utilize the CH that loads in the back workshop section adsorption tower equally
4CH during the gas adsorbent is dropped a hint preceding workshop section earlier
4Aspiration is attached to get off, and vacuumizes acquisition concentration then and has improved 2～3 times intermediate products gas; The unstripped gas of workshop section inlet house steward before this intermediate products gas returns again mixes back circulation carrying out CH with the raw material coal bed gas of preceding workshop section
4The recovery of gas is carried dense.
2. according to the described a kind of two stage low pressure method coal bed gas producing natural gas method of claim 1, it is characterized in that, after preceding workshop section adsorption process finishes, the CH before being attracted in workshop section's adsorption tower
4Gas is then by drop pressure, displacement extracting and concentrating technology;
Drop pressure: after adsorption process finishes, the adsorption tower and another adsorption tower that is in vacuum pressure condition that are in elevated pressures are connected, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other lower pressure adsorption tower of having finished regeneration; The constituent of air that is not adsorbed then flows out from the absorption cat head;
Before workshop section displacement carry dense: be used for high concentration CH in product natural gas surge tank
4Gas is replaced adsorption tower along the absorption direction of adsorption tower, and the air displacement in the adsorption tower dead space is gone out;
After back workshop section adsorption process finishes, be attracted to the CH in the back workshop section adsorption tower
4Gas is again by drop pressure, displacement extracting and concentrating technology;
Drop pressure: after adsorption process finishes, the adsorption tower and another adsorption tower that is in vacuum pressure condition that are in elevated pressures are connected, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other lower pressure adsorption tower of having finished regeneration; The constituent of air that is not adsorbed then flows out from the absorption cat head;
The displacement of back workshop section is carried dense: use from the high concentration CH in the intermediate products surge tank
4Gas is replaced adsorption tower along the absorption direction of adsorption tower, and the air displacement in the adsorption tower dead space is gone out.
3. a two stage low pressure method coal bed gas producing natural gas method is characterized in that, by two low pressure CH
4The attached dense workshop section series circulation of carrying of aspiration forms; Each CH
4Gas is carried dense workshop section all has 2～6 to be filled with 2-3 kind CH
4The adsorption tower of gas adsorbent; Preceding workshop section and back workshop section all adopt following vacuum regeneration technology:
From the coal bed gas of coal bed gas extracting device, temperature is a normal temperature, and pressure at first enters the adsorption tower of preceding workshop section, CH in preceding workshop section adsorption tower less than 0.05MPa.G
4Under the selection absorption of gas adsorbent, the H in the coal bed gas
2O and CH
4Component is adsorbed agent and absorbs, and the constituent of air that is not adsorbed then flows out from cat head, and workshop section drops a hint the direct emptying of dropping a hint of preceding workshop section before being called;
Then preceding workshop section adsorption tower is vacuumized, make the CH of absorption
4Gas is born again, thereby obtains CH
4Gas purity is greater than 50% intermediate products gas;
The back workshop section then intermediate products gas of former workshop section is a unstripped gas, is equally to utilize the CH that loads in the back workshop section adsorption tower
4Adsorbent is earlier with the CH in the intermediate products gas
4Aspiration is attached to get off, and vacuumizes to obtain concentration greater than 90% product natural gas; Workshop section's unstripped gas inlet house steward before the dropping a hint of back workshop section then loops back and carries out CH after the raw material coal bed gas of preceding workshop section is mixed once more
4The recovery of gas is carried dense.
4. according to the described a kind of two stage low pressure method coal bed gas producing natural gas method of claim 3, it is characterized in that, after preceding workshop section adsorption process finishes, the CH before being attracted in workshop section's adsorption tower
4Gas is then by drop pressure, displacement extracting and concentrating technology;
Drop pressure: after adsorption process finishes, the adsorption tower and another adsorption tower that is in vacuum pressure condition that are in elevated pressures are connected, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other lower pressure adsorption tower of having finished regeneration; The constituent of air that is not adsorbed then flows out from the absorption cat head;
The displacement of preceding workshop section is carried dense: use from the high concentration CH in the intermediate products surge tank
4Gas is replaced adsorption tower along the absorption direction of adsorption tower, and the air displacement in the adsorption tower dead space is gone out;
After back workshop section adsorption process finishes, be attracted to the CH in the back workshop section adsorption tower
4Gas is again by drop pressure, displacement extracting and concentrating technology;
Drop pressure: after adsorption process finishes, the adsorption tower and another adsorption tower that is in vacuum pressure condition that are in elevated pressures are connected, thereby naturally with the CH in the high pressure adsorption tower
4Gas is put into other lower pressure adsorption tower of having finished regeneration; The constituent of air that is not adsorbed then flows out from the absorption cat head;
The displacement of back workshop section is carried dense: be used for high concentration CH in product natural gas surge tank
4Gas is replaced adsorption tower along the absorption direction of adsorption tower, and the air displacement in the adsorption tower dead space is gone out.
5. according to claim 1 or 2 or 3 or 4 described a kind of two stage low pressure method coal bed gas producing natural gas methods, it is characterized in that the adsorbent in the described adsorption tower is silica type, activated carbon class or molecular sieve adsorbent.
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| CN101445755B (en) * | 2008-12-22 | 2012-11-28 | 中国石油集团长城钻探工程有限公司 | Method for purifying and liquefying coalbed gas |
| CN103031170A (en) * | 2012-12-14 | 2013-04-10 | 贵州盘江煤层气开发利用有限责任公司 | Production method for concentrating low-concentration gas to prepare LNG (liquefied natural gas) |
| CN105199798A (en) * | 2015-10-12 | 2015-12-30 | 宁波鲍斯能源装备股份有限公司 | Low-concentration coal bed gas enriching device |
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| CN108329962B (en) * | 2018-03-01 | 2021-05-14 | 中国石油化工股份有限公司 | Method and device for removing nitrogen in natural gas |
| CN111042773B (en) * | 2019-12-21 | 2021-11-12 | 山西晋城无烟煤矿业集团有限责任公司 | Low-pressure coal bed gas well emptying and recycling linkage device |
| CN114317052A (en) * | 2021-12-28 | 2022-04-12 | 西南化工研究设计院有限公司 | High-efficiency separation and purification method for low-concentration coal bed gas |
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