CN105435721A - Hydration reactor and method for separating methane in coalbed methane-air mixture by using same - Google Patents
Hydration reactor and method for separating methane in coalbed methane-air mixture by using same Download PDFInfo
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- CN105435721A CN105435721A CN201410493415.7A CN201410493415A CN105435721A CN 105435721 A CN105435721 A CN 105435721A CN 201410493415 A CN201410493415 A CN 201410493415A CN 105435721 A CN105435721 A CN 105435721A
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- hydrate
- hydration reactor
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- hydration
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 238000006703 hydration reaction Methods 0.000 title claims abstract description 74
- 230000036571 hydration Effects 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000203 mixture Substances 0.000 title abstract description 12
- 239000003245 coal Substances 0.000 claims description 63
- 239000012224 working solution Substances 0.000 claims description 36
- 239000002002 slurry Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 abstract description 26
- 239000012530 fluid Substances 0.000 abstract description 8
- 230000006835 compression Effects 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract description 5
- 238000004880 explosion Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 82
- 238000005516 engineering process Methods 0.000 description 7
- 238000005192 partition Methods 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- JRMUNVKIHCOMHV-UHFFFAOYSA-M tetrabutylammonium bromide Chemical compound [Br-].CCCC[N+](CCCC)(CCCC)CCCC JRMUNVKIHCOMHV-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FPGGTKZVZWFYPV-UHFFFAOYSA-M tetrabutylammonium fluoride Chemical compound [F-].CCCC[N+](CCCC)(CCCC)CCCC FPGGTKZVZWFYPV-UHFFFAOYSA-M 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention provides a hydration reactor and a method for separating methane in a coalbed methane-air mixture by using the same. The hydration reactor has the following structure: a hydration reactor cavity is provided with an inlet section, a throat tube section and a stable section along the flow direction of a hydrate working fluid, and the circulation area of the throat tube section is less than the circulation area of the inlet section and the circulation area of the stable section; the side wall, corresponding to the throat tube section, of the hydration reactor cavity is provided with a gas inlet. The hydration reactor provided by the invention adopts the principle of fluid mechanics, utilizes the change law of flowing of the hydrate working fluid at different positions in the reactor with the pressure, realizes the suction, self boosting and hydration separation processes of the coalbed methane-air mixture, omits the required step of carrying out compression boosting on the coalbed methane-air mixture during separation of methane in the coalbed methane-air mixture in a conventional hydration separation method, avoids dangerousness of explosion in the coalbed methane-air mixture compression and pressurization transport processes, and has the advantages of safe operation, and high actual industrial application feasibility.
Description
Technical field
The present invention relates to a kind of hydration reactor and utilize this reactor to be separated the method for methane in mixed empty coal bed gas, belong to chemical technology field.
Background technology
Coal bed gas (CoalBedMethane, be called for short CBM), also known as coal mine gas or mine gas, results from coalification course, mainly composes with adsorbed state and is stored in coal seam, the unconventional gas resource of main component that to be a kind of with methane be.
At present, the major way of exploiting coal bed methane is ground drilling and down-hole extraction.In the exploitation of ground drilling technology coal bed gas abroad, Application comparison is many, and Chinese Geological situation is complicated, the gas permeability in major part coal seam is poor, by the restriction of technology and geological conditions, in the exploitation of China coal bed gas Application comparison many or down-hole extraction technology.In the coal bed gas adopting direct drilling technology to obtain, methane content is generally greater than 90%, form close with the natural gas of routine, directly can utilize the natural gas pretreating process processing purification of comparative maturity, then pass into gas distributing system after direct liquefaction accumulating or pressurization.The coal bed gas adopting extraction technology in down-hole to obtain generally all can be mixed into air, methane content lower (usual volume fraction is at 30%-80%), the down-hole extraction coal bed gas of seldom part is only had to obtain effective utilization at present, major part is directly entered in air, causes the very large wasting of resources and environmental pollution.
In recent years, many researchers have carried out large quantifier elimination to the separation of methane in mixed empty coal bed gas, and existing have low-temperature deep partition method, membrane separation process, pressure-variable adsorption partition method and hydrate separation method for separating of the method for methane in mixed empty coal bed gas.But said method but exists different defects, constrain the separation of methane in the device of mixed empty coal seam.
Low-temperature deep partition method utilizes the boiling point of each component in coal bed gas different, adopts the mode of cryogenic rectification and liquefaction by each Component seperation.This partition method requires to operate at about-150 DEG C, and energy consumption is higher, because containing oxygen in mixed empty coal bed gas, need first to carry out deoxidation, there is the danger of blast; Membrane separation process realizes through the transfer rate of film is different under certain pressure reduction according to each component of gaseous mixture.But current developed membrane material is to the key component CH in coal bed gas
4and N
2separating effect not good, also there is the danger of blast simultaneously; Pressure-variable adsorption partition method utilize adsorbent under uniform temperature and pressure to gaseous mixture in the difference of each component adsorption capacity realize.Through the development of decades, pressure-variable adsorption is separated H
2, N
2and O
2worldwide all generally use etc. technology, but also do not use pressure-variable adsorption partition method to be separated the example of the commercial Application of mixed empty coal bed gas at present at home.
The all unrealized industrialized main cause of above-mentioned three kinds of isolation technics is that mixed empty coal bed gas is very easily exploded, and can not ensure the safety of separation process.Hydrate separation method is a kind of isolation technics of separation low boiling mist newly, and this technology is the complexity forming hydrate according to gas with various, thus realizes the separation of each component in mist.Existing hydrate separation method can make mixed empty coal bed gas be separated in water saturated environment under carry out, but because the separation of hydrate needs to carry out under pressure, early stage implements the same danger that there is blast of compression boosting process to mixed empty coal bed gas.
Therefore, how to avoid hydrate separation method to implement to compress the danger processing and bring to mixed empty coal bed gas early stage, can realize again the separation to methane in mixed empty coal bed gas, be that people want problem demanding prompt solution simultaneously always.
Summary of the invention
Technical problem solved by the invention is, a kind of hydration reactor is provided and utilizes this reactor to be separated the method for methane in mixed empty coal bed gas, this hydration reactor has used fluid mechanics principle, utilize the hydrate working solution flowing of diverse location and the Changing Pattern of pressure in the reactor, achieve the suction of mixed empty coal bed gas, from boosting and the process of hydration separation, eliminate existing hydration separation method and be separated the step of mixing methane in empty coal bed gas and needing to carry out compressing to mixed empty coal bed gas boosting, avoid the danger of exploding in mixed empty coal bed gas compression and pressurized delivered process, there is handling safety, the advantage that practical application in industry feasibility is strong.
The invention provides a kind of hydration reactor, described hydration reactor has following structure:
Hydration reactor cavity has entrance, trunnion section and stable section along hydrate working solution flow direction, and the circulation area of trunnion section is all less than the circulation area of entrance and stable section, the sidewall that this hydration reactor cavity corresponds to trunnion section offers air inlet.
In above-mentioned hydration reactor, the internal diameter of the pipeline of the entrance of described hydration reactor is 15-50mm, the internal diameter of described trunnion section and the internal diameter of the pipeline ratio of described entrance are 0.05-0.5, and the diameter of described air inlet and the internal diameter ratio of described trunnion section are 0.2-0.5;
The length of described entrance and the internal diameter of the pipeline ratio of described entrance are 1-3, and the internal diameter ratio of described trunnion segment length and described trunnion section is 1-2.5, and the length of described stable section and the internal diameter of the pipeline ratio of described entrance are 3-5.
Present invention also offers a kind of method utilizing above-mentioned hydration reactor to be separated methane in mixed empty coal bed gas, comprise the following steps:
Hydrate working solution is sent into described hydration reactor from entrance, mixed empty coal bed gas is communicated with hydration reactor by air inlet, mixed empty coal bed gas to be separated is sucked hydration reactor by the suction utilizing the hydrate working solution flowing through trunnion section to produce, and make the two flowing to mixed in stable section process, hydration reaction occur, generate hydrate slurry and methane lean gas;
Described hydrate slurry and methane lean gas are sent into hydrate separator, described methane lean gas is made to discharge from the top exit of hydrate separator and be collected, by described hydrate slurry through hydrate separator outlet at bottom send into hydrate dissolve device implement dissolve, be separated and collect methane-rich gas, dissolve the hydrate working solution removing gas, return hydrate working solution storage tank for hydration reaction cycle.
The separation method of methane in above-mentioned mixed empty coal bed gas, mainly make use of hydromechanical principle, utilize the flowing of the diverse location of hydrate working solution in hydration reactor and the Changing Pattern of pressure, achieve the process of the suction of mixed empty coal bed gas, certainly boosting and hydration separation.Be in particular in: the entrance of hydrate working solution from hydration reactor is injected, when it arrives the trunnion section of hydration reactor, because actual internal area sharply reduces, thus its flow velocity is increased suddenly, static pressure in hydration reactor is reduced fast, under the effect of pressure differential, mixed empty coal bed gas has been inhaled in hydration reactor and has mixed with hydrate working solution, when mixed empty coal bed gas and hydrate working solution arrive the stable section of hydration reactor, due to the expansion of actual internal area, thus the static pressure of fluid is raised, when the static pressure of fluid is greater than the generation pressure of hydrate, methane in mixed empty coal bed gas and hydrate working solution generation hydration reaction, form hydrate slurry, and aeriferous a part of gas phase obtains enrichment formation methane lean gas in mixed empty coal bed gas.
In the specific embodiment of the present invention, temperature when making hydrate working solution enter hydration reactor is 4-15 DEG C, and pressure is 0.6-5.1MPa.It is poor that hydrate working solution under this temperature and pressure is more conducive to flowing through trunnion section mineralization pressure at it, thus be conducive to the stable section that mixed empty coal bed gas is inhaled into hydration reactor, makes it to carry out hydration reaction with hydrate working solution, forms hydrate slurry.
In the specific embodiment of the present invention, the operating temperature of described hydrate separator is 4-15 DEG C, and operating pressure is 0.6-5.1MPa.In hydrate separator, control aforesaid operations temperature and operating pressure can make hydrate slurry be separated as much as possible completely with the air in mixed empty coal bed gas, realizes being separated of gas phase and liquid phase.
In the specific embodiment of the present invention, the operating temperature that described hydrate dissolves device is 8-23 DEG C, and operating pressure is 0.1-2.1MPa.Hydrate dissolve in device control aforesaid operations temperature and pressure can make hydrate slurry as much as possible Completion solution obtain methane-rich gas and remove the hydrate working solution of gas, realize being separated of methane and air in mixed empty coal bed gas.
In the specific embodiment of the present invention, the pressure before mixed empty coal bed gas to be separated is inhaled into hydration reactor is less than 0.6MPa.
Hydration reactor provided by the invention has used fluid mechanics principle, utilize the hydrate working solution flowing of diverse location and the Changing Pattern of pressure in the reactor, achieve the process of the suction of mixed empty coal bed gas, certainly boosting and hydration separation, eliminate existing hydration separation method and be separated the step of mixing methane in empty coal bed gas and needing to carry out compressing to mixed empty coal bed gas boosting, avoid the danger of exploding in the compression of mixed empty coal bed gas and pressurized delivered process, there is handling safety, advantage that practical application in industry feasibility is strong.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of hydration reactor of the present invention.
Fig. 2 is the process chart utilizing hydration reactor of the present invention to be separated methane in mixed empty coal bed gas.
Reference numeral:
1-hydrate working solution storage tank; 2-hydration reactor; 3-hydrate separator; 4-hydrate dissolves device; 5-high-pressure pump; 6-cooler; 7-heater; 8-pressure-reducing valve; 9-hydrate working solution; 10-mixes empty coal bed gas;
01-entrance; 02-trunnion section; 03-expanding reach; 04-air inlet.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, be clearly and completely described below to the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, hydration reactor of the present invention has following structure: hydration reactor cavity has entrance 01, trunnion section 02 and stable section 03 along hydrate working solution flow direction, and the circulation area of trunnion section 02 is all less than the circulation area of entrance 01 and stable section 03, the sidewall that this hydration reactor cavity corresponds to trunnion section 02 offers air inlet 04.
Further, the internal diameter of the pipeline of the entrance 01 of hydration reactor is 15-50mm, and the internal diameter of trunnion section 02 and the internal diameter of the pipeline ratio of entrance 01 are 0.05-0.5, and the diameter of air inlet 04 and the internal diameter ratio of trunnion section 02 are 0.2-0.5;
The length of entrance 01 and the internal diameter of the pipeline ratio of entrance 01 are 1-3, and the internal diameter ratio of trunnion section 02 length and trunnion section 02 is 1-2.5, and the length of stable section 03 and the internal diameter of the pipeline ratio of entrance 01 are 3-5.
Utilize hydration reactor to be as shown in Figure 1 separated the methane mixed in empty coal bed gas, its concrete separation method composition graphs 2 is described:
By the hydrate working solution 9 in hydrate working solution storage tank 1 after high-pressure pump 5 and cooler 6, send into hydration reactor 2 from entrance 01, temperature when making hydrate working solution 9 enter hydration reactor 2 is 4-15 DEG C, and pressure is 0.6-5.1MPa.Mixed empty coal bed gas 10 is communicated with hydration reactor 2 by air inlet 04, pressure before mixed empty coal bed gas 10 to be separated is inhaled into hydration reactor 2 is less than 0.6MPa, mixed empty coal bed gas 10 to be separated is sucked hydration reactor 2 by the suction utilizing the hydrate working solution 9 flowing through trunnion section 02 to produce, and make the two flowing to mixed in stable section 03 process, hydration reaction occur, generate hydrate slurry and methane lean gas;
Hydrate slurry and methane lean gas are sent into hydrate separator 3, the operating temperature of hydrate separator 3 is 4-15 DEG C, operating pressure is 0.6-5.1Mpa, methane lean gas is made to discharge from the top exit of hydrate separator 3 and be collected, by the outlet at bottom of hydrate slurry through hydrate separator 3, heater via 7 and pressure-reducing valve 8 rear feeding hydrate are dissolved device 4 and are implemented to dissolve, the operating temperature that hydrate dissolves device 4 is 8-23 DEG C, operating pressure is 0.1-2.1Mpa, be separated and collect methane-rich gas, dissolve the hydrate working solution removing gas, return in hydrate working solution storage tank 1 for hydration reaction cycle.
In the present invention, the selection of hydrate working solution can be selected according to the height of methane concentration in mixed empty coal bed gas, can be the aqueous solution of TBAB or tetrabutyl ammonium fluoride, can be with the addition of other the chemical substance that can improve hydrate formation speed, whether adding of these materials all affect technical scheme of the present invention with the height of concentration yet.
Embodiment
Hydrate working solution is TBAB (english abbreviation: TBAB), and its concentration is 10wt%;
Shown in the table 1 composed as follows of mixed empty coal bed gas:
Table 1 mixes the composition of empty coal bed gas
| Composition | CH 4 | Air (O 2、N 2) |
| Content, mol% | 37.52 | 62.48 |
Utilize hydration reactor to be as shown in Figure 1 separated the methane mixed in empty coal bed gas, its concrete separation method please refer to the explanation of above-mentioned separation method, and the technological parameter related to is as follows:
1) pressure of mixed empty coal bed gas is 0.5MPa.
2) temperature when hydrate working solution enters hydration reactor is 8 DEG C, and pressure is 3.0MPa.
3) hydrate working solution through the pressure of the trunnion of hydration reactor be 0.4MPa.
4) hydrate working solution is 2.5MPa with the fluid of the methanogenesis in mixed empty coal bed gas at the pressure of the stable section of hydration reactor.
5) operating temperature of hydrate separator is 8 DEG C, and operating pressure is 2.4MPa.
6) hydrate dissolves the operating temperature of device is 9 DEG C, and operating pressure is 0.2MPa.
Technological process through Fig. 2 is separated the composition of methane lean gas and the methane-rich gas obtained, as shown in table 2 below:
The composition of table 2 methane-rich gas and methane lean gas
| Composition | CH 4 | Air (O 2、N 2) |
| The content of methane-rich gas, mol% | 64.384 | 35.616 |
| The content of methane lean gas, mol% | 14.556 | 85.444 |
As shown in Table 2, in methane-rich gas, the mole fraction of methane is 64.384mol/L, and the rate of recovery of methane reaches 79%, and this result shows: methane in mixed empty coal bed gas can effectively be separated by above-mentioned hydrate separation method.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. a hydration reactor, is characterized in that, described hydration reactor has following structure:
Hydration reactor cavity has entrance, trunnion section and stable section along hydrate working solution flow direction, and the circulation area of trunnion section is all less than the circulation area of entrance and stable section, the sidewall that this hydration reactor cavity corresponds to trunnion section offers air inlet.
2. hydration reactor according to claim 1, it is characterized in that, the internal diameter of the pipeline of the entrance of described hydration reactor is 15-50mm, the internal diameter of described trunnion section and the internal diameter of the pipeline ratio of described entrance are 0.05-0.5, and the diameter of described air inlet and the internal diameter ratio of described trunnion section are 0.2-0.5;
The length of described entrance and the internal diameter of the pipeline ratio of described entrance are 1-3, and the internal diameter ratio of described trunnion segment length and described trunnion section is 1-2.5, and the length of described stable section and the internal diameter of the pipeline ratio of described entrance are 3-5.
3. utilize the hydration reactor described in claim 1 or 2 to be separated a method for methane in mixed empty coal bed gas, it is characterized in that, comprise the following steps:
Hydrate working solution is sent into described hydration reactor from entrance, mixed empty coal bed gas is communicated with hydration reactor by air inlet, mixed empty coal bed gas to be separated is sucked hydration reactor by the suction utilizing the hydrate working solution flowing through trunnion section to produce, and make the two flowing to mixed in stable section process, hydration reaction occur, generate hydrate slurry and methane lean gas;
Described hydrate slurry and methane lean gas are sent into hydrate separator, described methane lean gas is made to discharge from the top exit of hydrate separator and be collected, by described hydrate slurry through hydrate separator outlet at bottom send into hydrate dissolve device implement dissolve, be separated and collect methane-rich gas, dissolve the hydrate working solution removing gas, return hydrate working solution storage tank for hydration reaction cycle.
4. method according to claim 3, is characterized in that, temperature when making hydrate working solution enter hydration reactor is 4-15 DEG C, and pressure is 0.6-5.1MPa.
5. method according to claim 3, is characterized in that, the operating temperature of described hydrate separator is 4-15 DEG C, and operating pressure is 0.6-5.1MPa.
6. method according to claim 3, is characterized in that, the operating temperature that described hydrate dissolves device is 8-23 DEG C, and operating pressure is 0.1-2.1MPa.
7. the method according to claim 3 or 4, is characterized in that, the pressure before mixed empty coal bed gas to be separated is inhaled into hydration reactor is less than 0.6MPa.
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|---|---|---|---|
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| CN201410493415.7A CN105435721B (en) | 2014-09-24 | 2014-09-24 | A kind of hydration reactor and the method using methane in the mixed empty coal bed gas of reactor separation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114437842A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Gas continuous separation system of hydrate method combined membrane method and disturbance device thereof |
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| CN101530719A (en) * | 2008-03-13 | 2009-09-16 | 中国石油大学(北京) | Method and device for low-pressure processing of coal bed gas |
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| JP2012219660A (en) * | 2011-04-05 | 2012-11-12 | Fuji Heavy Ind Ltd | Exhaust emission control device of engine |
| CN103388487A (en) * | 2013-08-12 | 2013-11-13 | 上海理工大学 | Recovery device for methane in mine discharged air and application thereof |
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2014
- 2014-09-24 CN CN201410493415.7A patent/CN105435721B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070048856A1 (en) * | 2005-07-27 | 2007-03-01 | Carmen Parent | Gas purification apparatus and process using biofiltration and enzymatic reactions |
| CN101530719A (en) * | 2008-03-13 | 2009-09-16 | 中国石油大学(北京) | Method and device for low-pressure processing of coal bed gas |
| JP2012219660A (en) * | 2011-04-05 | 2012-11-12 | Fuji Heavy Ind Ltd | Exhaust emission control device of engine |
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| CN103388487A (en) * | 2013-08-12 | 2013-11-13 | 上海理工大学 | Recovery device for methane in mine discharged air and application thereof |
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| CN114437842A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Gas continuous separation system of hydrate method combined membrane method and disturbance device thereof |
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