CN107937076B - Underground gas extraction processing device - Google Patents
Underground gas extraction processing device Download PDFInfo
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- CN107937076B CN107937076B CN201711299241.0A CN201711299241A CN107937076B CN 107937076 B CN107937076 B CN 107937076B CN 201711299241 A CN201711299241 A CN 201711299241A CN 107937076 B CN107937076 B CN 107937076B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses an underground gas extraction treatment device, which is a treatment device for removing slag from gas through a solid filling material and removing water vapor through a drying pipe, and can be used for discontinuously drying the gas twice, removing water in the gas and avoiding the damage of dust and water in the gas to an extraction pipeline. On its characterized in that gas injection pipe arranged the main part case in, and communicate mutually with the main part case, the main part case is airtight cylinder box, and the gas injection pipe is close to main part bottom of the case portion, and main part incasement wall is arranged in to cowl, and covers on the gas injection pipe, cowl is spherical sieve, and on the main part case was arranged in to the outlet duct, and one end extended to the main part incasement, sealed snap ring arranged in between main part case and the outlet duct, and formed sealed cooperation, sealed snap ring is made for the rubber material, and the inside wall equidistance opens there is many rings of ring channels, form the annular laminating of many rings between sealed snap ring inner wall and the outlet duct, the one end and the outlet duct of.
Description
Technical Field
The invention discloses an underground gas extraction treatment device, relates to a treatment device for deslagging and drying extracted gas when the underground gas is extracted, and belongs to the field of coal mine facilities. In particular to a processing device for removing slag from gas by solid filling material and removing water vapor by a drying tube.
Background
At present, when coal mining is carried out, in order to ensure the safety of a working face, underground gas is extracted, because the extracted gas is extracted from a coal seam by external power, a large amount of dust is contained during extraction, and water vapor is formed in a gas extraction pipe along with the change of the temperature along the line of the extraction pipe, so that the dust and water content in the gas are increased, when the gas passes through the line of the pipeline, an impeller, a valve body and a sealing piece on the pipeline are damaged, the operation of an extraction pump is influenced, the gas extraction efficiency is reduced, and the dust mixed water vapor is accumulated in the pipeline, so that the flow cross section of the pipeline is reduced, the flow rate of the gas is increased when the gas passes through the cross section, and the gas is heated by friction with the pipe wall, safety accidents are easily caused, the existing method for filtering the gas is that a filter screen is simply additionally arranged at the port of the pipeline, the gas is subjected to deslagging, and a flushing device is additionally, the filter screen is flushed, so that the humidity in the gas is increased during flushing, the gas extraction rate is reduced during gas extraction, the extraction power is increased, and the energy loss is increased;
the publication number CN105201545A discloses a coal mine gas extraction pipeline filtering and fire suppression device, which comprises a filtering and fire suppression tank body, and a gas conveying component, a filter medium component and a water quantity control deslagging component which are arranged on the filtering and fire suppression tank body.
Disclosure of Invention
In order to improve the situation, the underground gas extraction treatment device provided by the invention has the advantages that the solid filling material is used for removing slag from the gas, and then the gas is subjected to water vapor removal through the drying pipe, so that the gas can be discontinuously dried twice, the moisture in the gas can be removed, and the damage of dust and moisture in the gas to an extraction pipeline can be avoided.
The invention relates to an underground gas extraction treatment device which is realized as follows: the invention relates to a downhole gas extraction treatment device which comprises a main body box, a gas inlet pipe, a connecting rod, an arc-shaped baffle, a gas injection pipe, filling particles, a filter cylinder, a connecting pipe, a drying cylinder, a sealing snap ring, a gas outlet pipe, a filter screen, a support ring, a fixing ring and an arc-shaped rod, wherein the gas injection pipe is arranged on the main body box and is communicated with the main body box, the main body box is a closed cylindrical box body, the gas injection pipe is close to the bottom of the main body box, the arc-shaped baffle is arranged on the inner wall of the main body box and covers the gas injection pipe, the arc-shaped baffle is a spherical screen plate, the gas outlet pipe is arranged on the main body box, one end of the gas outlet pipe extends into the main body box, the sealing snap ring is arranged between the main body box and the gas outlet pipe and forms sealing fit, the sealing snap ring is made of rubber, the drying device is characterized in that the connecting pipe is arranged in the main box, the connecting pipe is a U-shaped pipe, a filter cylinder is arranged in the middle of the connecting pipe, the filter cylinder is formed by combining a plurality of filter plates, filter holes of the filter plates are hexagonal, filter hole parts on two adjacent filter plates are overlapped, two drying cylinders are arranged on the U-shaped pipe and are respectively positioned on two sides of the filter cylinder, one end of the air inlet pipe is arranged on the other end of the connecting pipe and communicated, the other end of the air inlet pipe is arranged below a top plate of the main box, a filling material is arranged between the connecting pipe and the main box, the filling height of the filling material is not lower than the highest point of the arc baffle plate, the filling material is solid filling particles, each particle is of a loose porous structure, the drying cylinder is of a drum shape, a drying core is arranged in the drying cylinder, the drying core, solid fixed ring and support ring inner wall are connected through a plurality of connecting rods, connecting rod and drying cylinder axis nonparallel, a plurality of connecting rod cooperations form the big column passageway in middle little both ends, and the outer wall of solid fixed ring and support ring is connected through a plurality of arc poles, the both ends line of arc pole and the axis nonparallel of drying cylinder, and with connecting axle declination opposite direction, arc pole and drying cylinder inner wall are laminated mutually, and solid fixed ring's interior circle has put the filter screen, and the filter screen has been put to the interior circle of support ring, the filter screen surface is planted with the one deck asbestos.
When the drying device is used, two different drying agents are filled between filter screens in a drying core, the first drying agent is a physical drying agent, the second drying agent is a chemical drying agent, the physical drying agent is uniformly filled in a channel between connecting rods, the chemical drying agent is filled in an annular area between the connecting rods and an arc-shaped rod, so that the chemical drying agent and the physical drying agent are attached through gaps between the connecting rods, then the drying core is placed in a drying cylinder, a gas injection pipe is communicated with a gas discharge pipe, a gas outlet pipe is communicated with an extraction pipe, then an extraction pump is started to extract the main box to form negative pressure, gas enters the main box from the gas injection pipe, passes through an arc-shaped baffle plate and enters a filling material to be expanded in the filling material, dust in the gas is precipitated and adsorbed in the filling material, and most of the dust in the gas is deposited at the bottom of the main box after the viscous flow of the filling material, then the gas with water vapor enters from the air inlet pipe, passes through the drying cylinders on the communicating pipe, enters the filter cylinder after being dried, filters the residual dust, then passes through the other drying cylinder for drying, finally enters the extraction pipe from the air outlet pipe, when the gas enters the drying cylinders, the gas flow passes through the filter screen on the fixing ring, directly enters the area between the connecting rods, and contacts with the physical drying agent, the moisture in the gas is physically adsorbed by the physical drying agent, when the moisture content in the material drying agent is larger, the chemical drying agent sucks the moisture in the physical drying agent, the moisture in the material drying agent is reacted and dried, the drying of the physical drying agent is ensured, the dried gas enters the filter cylinder through the connecting pipe, the residual dust is filtered, dried again, and finally extracted by the extraction pipe,
the arc-shaped baffle is arranged on the inner wall of the main body box and covers the gas injection pipe, and can enable solid filling materials and the gas injection pipe in the main body box to enter a partition, so that the filling materials are located in the main body box, and the filling materials are prevented from entering the injection pipe to block the injection pipe, so that the continuous extraction is influenced, and the gas is difficult to filter;
the arc-shaped baffle is a spherical cap-shaped sieve plate, so that gas entering from the gas injection pipe can be diffused along all directions through the sieve meshes on the arc-shaped baffle, the gas can be diffused in a large area in the filling material and can be fully contacted with the filling material, and dust can be deposited and stagnated in the filling material;
the sealing snap ring is made of rubber, a plurality of circles of annular grooves are formed in the inner side wall of the sealing snap ring at equal intervals, the air outlet pipe can be elastically wrapped, the air inlet pipe and the sealing snap ring are in phase difference sealing connection, the sealing snap ring and the air outlet pipe can be divided into opposite sections by the aid of the plurality of circles of annular grooves formed at equal intervals, a plurality of circles of annular attaching parts are formed between the sealing snap ring and the air outlet pipe, multiple sealing protection can be formed, and gas overflow is avoided;
the filter holes of the filter plates are hexagonal, and the filter holes on two adjacent filter plates are overlapped, so that a channel formed by the filter holes can be gradually divided and reduced, and residual dust is blocked for further filtering;
the filling height of the filling material is not lower than the highest point of the arc-shaped baffle, so that all gas entering from the gas injection pipe can be blocked, and the gas is prevented from directly entering the connecting pipe without being blocked and precipitated by the filling material;
the filling material is solid filling particles, and single particles are in a loose porous structure and can adsorb solid dust, and the dust is deposited and stored in gaps formed by mutual accumulation;
the drying cylinder is drum-shaped, a drying core is arranged in the drying cylinder, and the drying core can be fixed and limited, so that the phenomenon that the drying core slides along a connecting pipe to cause uncertain drying position and incomplete gas drying is avoided;
the connecting rods are not parallel to the axis of the drying cylinder, the connecting rods are matched to form a cylindrical channel with a small middle part and large two ends, the physical drying agent can be fixedly clamped, the flow velocity of gas is increased along with the change of the section, and water molecules with increased mass are adsorbed by the physical drying agent after being subjected to inertial delay;
the connecting line of the two ends of the arc-shaped rod is not parallel to the axis of the drying cylinder, and the deflection direction of the connecting shaft is opposite to that of the connecting shaft, so that the connecting rod and the arc-shaped rod can be staggered in space, and the drying agent is fixed by a net bag, and the drying agent is prevented from falling off during extraction to influence the gas dewatering;
the arc-shaped rod is attached to the inner wall of the drying cylinder in the opposite direction, so that the drying core can be fixed in the drying cylinder, the phenomenon that the drying core is deflected under the pressure of extraction is avoided, and the drying core is fixed and limited;
the surface of the filter screen is planted with a layer of asbestos, so that water drops in the gas can be adsorbed, the flowing of the gas is blocked, the time of the gas in the drying cylinder and the filter cylinder is prolonged, the mutual matching of the filter screens ensures that pressure difference exists in the connecting pipe, the flowing direction of the gas is ensured, and backflow is avoided;
the purpose of filtering and drying the underground gas extraction is achieved.
Has the beneficial effects.
The structure is simple, and the device is convenient and practical.
Secondly, can hinder through the filler material, deposit the dust removal to gas.
And thirdly, the gas can be discontinuously dried twice, and the moisture in the gas can be removed.
And fourthly, the damage of dust and moisture in the gas to the extraction pipeline can be avoided.
Drawings
Fig. 1 is a schematic structural diagram of an underground gas extraction treatment device of the invention.
Fig. 2 is a three-dimensional structure diagram of a drying core of the underground gas extraction treatment device.
In the attached drawings
Wherein the parts are: main body case (1), intake pipe (2), connecting rod (3), cowl (4), gas injection pipe (5), packing granule (6), cartridge filter (7), connecting pipe (8), drying cylinder (9), sealed snap ring (10), outlet duct (11), filter screen (12), support ring (13), solid fixed ring (14), curved rod (15)
The specific implementation mode is as follows:
the invention relates to an underground gas extraction treatment device which is realized as follows: when the drying device is used, two different drying agents are filled between the filter screens (12) in the drying core, the first drying agent is a physical drying agent, the second drying agent is a chemical drying agent, the physical drying agents are uniformly filled in a channel between the connecting rods (3), the chemical drying agents are filled in an annular area between the connecting rods (3) and the arc-shaped rods (15), so that the chemical drying agents and the physical drying agents are attached through gaps between the connecting rods (3), then the drying core is placed in the drying cylinder (9), the gas injection pipe (5) is communicated with the gas outlet pipe, the gas outlet pipe (11) is communicated with the gas extraction pipe, the gas extraction pump is started to extract gas from the main body box (1) to form negative pressure, the gas enters the main body box (1) from the gas injection pipe (5) and passes through the arc-shaped baffle (4) to enter the filling material, expansion is carried out in the filling material, and dust in the gas is precipitated and adsorbed in the filling material, after stagnation of the filling material, most of dust in the gas is deposited at the bottom of the main box (1), then the gas with water vapor enters from the air inlet pipe (2), passes through the drying cylinder (9) on the communicating pipe, enters the filter cylinder (7) after being dried, filters the residual dust, then passes through the other drying cylinder (9) to be dried, finally enters the extraction pipe from the air outlet pipe (11), when entering the drying cylinder (9), the air flow directly enters the area between the connecting rods (3) through the filter screen (12) on the fixing ring (14) and is contacted with the physical drying agent, the moisture in the gas is physically adsorbed by the physical drying agent, when the moisture content in the material drying agent is large, the chemical drying agent sucks the moisture in the physical drying agent, reacts and dries the moisture in the material drying agent, and ensures the drying of the physical drying agent, the dried gas enters a filter cylinder (7) through a connecting pipe (8), the residual dust is filtered, the gas is dried again and finally extracted through an extraction pipe,
the arc-shaped baffle (4) is arranged on the inner wall of the main body box (1) and covers the gas injection pipe (5), and can enable solid filling materials in the main body box (1) and the gas injection pipe (5) to enter a barrier, so that the filling materials are located in the main body box (1), and the filling materials are prevented from entering the injection pipe to form blockage on the injection pipe, which influences the continuity of extraction and drainage and causes difficulty in filtering gas;
the arc-shaped baffle (4) is a spherical cap-shaped sieve plate, so that gas entering from the gas injection pipe (5) can be diffused along all directions through sieve meshes on the arc-shaped baffle (4), the gas can be diffused in a large area in the filling material and can be fully contacted with the filling material, and dust can be deposited and stagnated in the filling material;
the sealing snap ring (10) is made of rubber, a plurality of rings of annular grooves are formed in the inner side wall of the sealing snap ring at equal intervals, the air outlet pipe (11) can be elastically wrapped, the air inlet pipe (2) and the sealing snap ring (10) are in phase difference sealing connection, the plurality of rings of annular grooves are formed at equal intervals, the binding surface between the sealing snap ring (10) and the air outlet pipe (11) can be divided into opposite sections, and a plurality of rings of annular binding are formed between the sealing snap ring (10) and the air outlet pipe (11), so that multiple sealing protection can be formed, and the gas overflow is;
the filter holes of the filter plates are hexagonal, and the filter holes on two adjacent filter plates are overlapped, so that a channel formed by the filter holes can be gradually divided and reduced, and residual dust is blocked for further filtering;
the filling height of the filling material is not lower than the highest point of the arc-shaped baffle (4), so that all gas entering from the gas injection pipe (5) can be blocked, and the gas is prevented from directly entering the connecting pipe (8) without being blocked and precipitated by the filling material;
the filling material is solid filling particles (6), and single particles are in a loose porous structure and can adsorb solid dust, and the dust is deposited and stored in gaps formed by mutual accumulation;
the drying cylinder (9) is drum-shaped, a drying core is arranged in the drying cylinder (9) and can be fixed and limited, and the phenomenon that the drying core slides along the connecting pipe (8) to cause uncertain drying position and incomplete gas drying is avoided;
the axes of the connecting rods (3) are not parallel to the axis of the drying cylinder (9), the connecting rods (3) are matched to form a cylindrical channel with a small middle and large two ends, so that the physical drying agent can be fixedly clamped, the flow velocity of gas is increased along with the change of the cross section, and water molecules with increased mass are adsorbed by the physical drying agent after being subjected to inertial delay;
the connecting line of the two ends of the arc-shaped rod (15) is not parallel to the axis of the drying cylinder (9) and is opposite to the deflection angle direction of the connecting shaft, so that the connecting rod (3) and the arc-shaped rod (15) can be staggered in space, and the drying agent is fixed by a net bag, so that the drying agent is prevented from falling off during extraction and the gas dewatering is prevented from being influenced;
the arc-shaped rod (15) is attached to the inner wall of the drying cylinder (9) in the opposite direction, so that the drying core can be fixed in the drying cylinder (9), the phenomenon that the drying core is deflected when the pressure of extraction is generated is avoided, and the drying core is fixed and limited;
the surface of the filter screen (12) is planted with a layer of asbestos, so that water drops in gas can be adsorbed, the flowing of the gas is blocked, the time of the gas in the drying cylinder (9) and the filter cylinder (7) is prolonged, and the asbestos is matched with the filter screens (12) to ensure the pressure difference in the connecting pipe (8), ensure the flowing direction of the gas and avoid backflow;
the purpose of filtering and drying the underground gas extraction is achieved.
Claims (9)
1. The utility model provides a processing apparatus is taken out in pit gas, characterized by: comprises a main body box, an air inlet pipe, a connecting rod, an arc baffle, an air injection pipe, filling particles, a filter cartridge, a connecting pipe, drying cylinders, a sealing snap ring, an air outlet pipe, a filter screen, a supporting ring, a fixing ring and an arc rod, wherein the air injection pipe is arranged on the main body box and is communicated with the main body box, the main body box is a closed cylindrical box body, the air injection pipe is close to the bottom of the main body box, the air outlet pipe is arranged on the main body box, one end of the air outlet pipe extends into the main body box, the sealing snap ring is arranged between the main body box and the air outlet pipe and forms sealing fit, a plurality of annular grooves are formed in the inner side wall at equal intervals, a plurality of annular grooves are formed between the inner wall of the sealing snap ring and the air outlet pipe, one end of the connecting pipe is communicated with the air outlet pipe, the connecting pipe is, and are located the cartridge filter both sides respectively, and intake pipe one end is arranged in on the connecting pipe other end, and is linked together, and the other end is arranged in main part roof below, has put filler between connecting pipe and the main part case, the dryer section of thick bamboo is the drum type, and the dryer section of thick bamboo embeds has the drying core, the drying core comprises solid fixed ring, support ring, connecting rod and arc pole, and solid fixed ring corresponds to be arranged in the dryer section of thick bamboo by the one end inner wall, and the support ring is arranged in dryer section of thick bamboo other end inner wall, and solid fixed ring and support ring inner wall are connected through a plurality of connecting rods, connecting rod and dryer section of thick bamboo axis nonparallel, a plurality of connecting rods cooperate to form the little both ends big column passageway in the middle, and the outer wall of solid fixed ring and support ring is connected through a plurality of arc poles, the, the inner ring of the fixing ring is provided with a filter screen, the inner ring of the support ring is provided with the filter screen, and the surface of the filter screen is planted with a layer of asbestos.
2. The downhole gas extraction treatment device according to claim 1, wherein two different desiccants are filled between the filter screens in the drying core during use, the first desiccant is a physical desiccant, and the second desiccant is a chemical desiccant.
3. The underground gas extraction treatment device according to claim 1, wherein the arc-shaped baffle is arranged on the inner wall of the main box and covers the gas injection pipe.
4. The underground gas extraction treatment device according to claim 1 or 3, wherein the arc-shaped baffle is a spherical-crown-shaped sieve plate.
5. The underground gas extraction treatment device according to claim 1, wherein the sealing snap ring is made of rubber.
6. The underground gas extraction treatment device according to claim 1, wherein the filter holes of the filter plates are hexagonal, and the filter hole parts of two adjacent filter plates are overlapped.
7. The underground gas extraction treatment device according to claim 1, wherein the filling height of the filling material is not lower than the highest point of the arc-shaped baffle.
8. The underground gas extraction treatment device according to claim 7, wherein the filling material is solid filling particles, and the single particles are in a loose porous structure.
9. The underground gas extraction treatment device according to claim 1 or 2, wherein a layer of asbestos is planted on the surface of the filter screen, water drops in the gas can be adsorbed, the flowing of the gas is blocked, the time of the gas in the drying cylinder and the filter cylinder is prolonged, and through mutual matching of the plurality of filter screens, the pressure difference exists in the connecting pipe, the flowing direction of the gas is ensured, and backflow is avoided.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711299241.0A CN107937076B (en) | 2017-12-08 | 2017-12-08 | Underground gas extraction processing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711299241.0A CN107937076B (en) | 2017-12-08 | 2017-12-08 | Underground gas extraction processing device |
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| CN107937076B true CN107937076B (en) | 2020-07-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596391A (en) * | 2009-06-05 | 2009-12-09 | 安徽理工大学 | The pressure swing adsorption and staged concentrated method of a kind of low concentration gas |
| CN204627660U (en) * | 2015-05-21 | 2015-09-09 | 房耀洲 | A kind of negative pressure gas pumping device |
| RU2606740C1 (en) * | 2015-12-22 | 2017-01-10 | Закрытое акционерное общество "Тюменский институт нефти и газа" (ЗАО "ТИНГ") | Method of development of oil fringe and under-gaz zone of complex deposits |
| CN206625829U (en) * | 2017-03-16 | 2017-11-10 | 安阳鑫龙煤业(集团)技工学校 | A kind of coal mine gas separator |
-
2017
- 2017-12-08 CN CN201711299241.0A patent/CN107937076B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596391A (en) * | 2009-06-05 | 2009-12-09 | 安徽理工大学 | The pressure swing adsorption and staged concentrated method of a kind of low concentration gas |
| CN204627660U (en) * | 2015-05-21 | 2015-09-09 | 房耀洲 | A kind of negative pressure gas pumping device |
| RU2606740C1 (en) * | 2015-12-22 | 2017-01-10 | Закрытое акционерное общество "Тюменский институт нефти и газа" (ЗАО "ТИНГ") | Method of development of oil fringe and under-gaz zone of complex deposits |
| CN206625829U (en) * | 2017-03-16 | 2017-11-10 | 安阳鑫龙煤业(集团)技工学校 | A kind of coal mine gas separator |
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| CN107937076A (en) | 2018-04-20 |
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