CN112554937B - Method for converting coal bed gas by using novel catalyst - Google Patents
Method for converting coal bed gas by using novel catalyst Download PDFInfo
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- CN112554937B CN112554937B CN202011398459.3A CN202011398459A CN112554937B CN 112554937 B CN112554937 B CN 112554937B CN 202011398459 A CN202011398459 A CN 202011398459A CN 112554937 B CN112554937 B CN 112554937B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 84
- 239000003245 coal Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 127
- 238000000605 extraction Methods 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 238000003860 storage Methods 0.000 claims abstract description 10
- 230000003197 catalytic effect Effects 0.000 claims abstract description 3
- 230000001590 oxidative effect Effects 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 42
- 239000007788 liquid Substances 0.000 claims description 35
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 238000005086 pumping Methods 0.000 claims description 20
- 238000000746 purification Methods 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 6
- 229910052741 iridium Inorganic materials 0.000 claims description 4
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical group [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 4
- LQZDYPHFVGRHKD-UHFFFAOYSA-N 2-methyl-1,10-phenanthroline Chemical compound C1=CN=C2C3=NC(C)=CC=C3C=CC2=C1 LQZDYPHFVGRHKD-UHFFFAOYSA-N 0.000 claims description 3
- 239000003446 ligand Substances 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000003034 coal gas Substances 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 38
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000005065 mining Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 150000001639 boron compounds Chemical class 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 125000003636 chemical group Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a method for converting coal bed gas by adopting a novel catalyst, belonging to the field of coal bed gas extraction and comprising the following specific steps: (1) arranging a series of drilling sites on a coal seam to be mined, and arranging drill holes on the coal seam through the drilling sites; (2) injecting a solution containing a catalyst into a coal seam to be mined along a drill hole, directly oxidizing gas in the coal seam into methanol under the catalytic action, and dissolving the methanol in the solution containing the catalyst; (3) and extracting the methanol solution containing the catalyst from the coal bed, separating the catalyst from the methanol solution by using an underground separation system, injecting the separated catalyst into the coal body again to realize the cyclic utilization of the catalyst solution, and storing the purified methanol solution into a methanol storage tank. The gas extraction device not only can extract free gas, but also can extract gas attached to coal, greatly improves the gas extraction efficiency, and simultaneously converts and dissolves the gas, so that the gas extraction safety is greatly improved.
Description
Technical Field
The invention relates to the field of coal mine gas extraction, in particular to a method for converting coal bed gas by using a novel catalyst.
Background
Gas is also called coal bed gas as one of main disasters in coal mine safety production, in recent years, as the mining intensity and the mining depth of coal mines in China are continuously increased and are influenced by high ground stress, high gas pressure and high gas content, the coal mine gas disasters gradually become main contents of mine disasters, and meanwhile, the gas is used as an energy substance, and due to the influences of factors such as high collection difficulty, high storage risk and the like, the utilization rate of the gas is extremely low, and a large amount of waste of the energy substance is caused. The gas extraction is used as an important means for preventing gas accidents, so that the gas content of the coal bed can be greatly reduced, and the gas resource can be collected and utilized.
At present, the commonly used gas extraction means in China are as follows: hydraulic fracturing, deep hole pre-fracturing blasting and gas drainage drilling, wherein the hydraulic fracturing injects a large amount of water into a coal body to cause too high humidity during working face stoping, so that the production efficiency is influenced; explosive is needed for deep hole pre-splitting blasting, and gas disasters caused by open fire are easy to generate; the gas extraction efficiency of the gas extraction hole in a free state is high by extracting gas through the internal and external pressure difference of the coal body, and the extraction effect of the gas attached to the coal body is greatly reduced.
In conclusion, the existing gas extraction method has the problems that the safe and efficient gas extraction cannot be effectively solved, and the subsequent coal mining environment is affected.
Disclosure of Invention
The invention aims to provide a method for converting coal bed gas by adopting a novel catalyst, which not only can safely and efficiently extract coal bed gas and reduce the danger of gas, but also can improve the production condition of a working face and provide a good operation environment for subsequent mining.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method for converting coal bed gas by using a novel catalyst comprises the following steps:
(1) arranging a series of drilling sites on a coal seam to be mined, and arranging bedding drill holes on the coal seam through the drilling sites;
(2) injecting a solution containing a catalyst into a coal seam to be mined along a drill hole through a catalyst injection system, directly oxidizing gas in the coal seam into methanol under the catalytic action, and dissolving the methanol in the catalyst solution, wherein the catalyst is an iridium catalyst containing a 2-methyl phenanthroline ligand;
(3) the methanol solution containing the catalyst is extracted from the coal bed through liquid extraction equipment, the catalyst and the methanol solution are separated through an underground separation system, the separated catalyst solution is injected into the coal body again, the catalyst is recycled, and the purified methanol solution is stored in a methanol storage tank.
Further, step (1) arranges a series of drill sites in the driving roadway of the working face to be mined, and the operation steps are as follows: firstly, arranging a series of drilling sites on one side of a working face to be mined, arranging a series of liquid injection holes in the drilling sites, and injecting a solution containing a catalyst into a coal body; thirdly, arranging a series of drilling sites on the other side of the working face to be mined, and arranging a series of liquid extraction holes in the drilling sites for extracting the catalyst solution containing the methanol after the reaction with the coal gas is finished.
Furthermore, the catalyst injection system comprises raw material preparation equipment, mixing equipment, pumping equipment and liquid injection equipment, wherein all the equipment is positioned in the large roadway chamber of the track. Wherein raw materials preparation equipment includes that the catalyst prepares equipment and water supply installation, compounding equipment is including stirring pond and mixer, pumping equipment includes high-pressure pump and pumping controller, and the output that equipment and water supply installation were prepared to the catalyst communicates the feed end in stirring pond respectively, stirs the pond and connects the mixer, and the entry of pipe connection high-pressure pump is passed through to the discharge gate in stirring pond, and the liquid equipment is annotated through the pipe connection in the export of high-pressure pump, and the pumping controller sets up on the pipeline between high-pressure pump and liquid equipment.
Preferably, the underground separation system comprises a separation device and a purification device, an inlet of the separation device is connected with the liquid extraction device, a liquid phase outlet of the separation device is connected with an inlet of the purification device, and an outlet of the purification device is connected with the methanol storage tank.
Preferably, the purification equipment is rectification purification equipment.
The iridium catalyst containing the 2-methyl phenanthroline ligand has the working principle that one of three carbon-hydrogen bonds in a methyl group is broken by virtue of iridium, namely, a hydrogen atom in the methyl group is cut off, then a boron compound is inserted, the boron compound can be easily substituted by other more complex chemical groups, the novel catalyst is easy to operate, and various chemical substances can be attached to any type of carbon-hydrogen bonds by virtue of a catalytic reaction generated by the novel catalyst. The catalyst can directly catalyze and oxidize methane into methanol.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, a solution containing a catalyst is injected into a coal body through a high-pressure pump, so that on one hand, the coal body crack is enlarged, and the catalyst solution and the gas on a working face to be mined are fully reacted; on the other hand, the catalyst solution fully reacts with the gas in the coal body through the cracks, and the gas extraction efficiency is improved.
2. According to the invention, gas state gas is converted into liquid state methanol solution, the extraction safety is obviously improved, and the injected catalyst solution can not only react with free methane molecules, but also react with methane molecules attached to the surface of a coal body, so that the gas extraction efficiency is obviously improved; the solution containing the catalyst is injected into the coal body, so that the humidity of the coal body is improved, the fire hazard of the coal body is reduced, and meanwhile, the water absorbs heat, so that the hazard of gas disasters is reduced.
Drawings
FIG. 1 is a plan view of a catalyst withdrawal system;
FIG. 2 is a cross-sectional view of a drill site layout of a face to be mined;
in the figure: 1-rail climbing, 2-transportation climbing, 3-working face rail lane, 4-rubber belt transportation lane, 5-rail lane, 6-methanol storage tank, 7-purification equipment, 8-separation equipment, 9-stirring tank, 10-stirrer, 11-high pressure pump, 12-pumping controller, 13-water supply equipment, 14-catalyst preparation equipment, 15-liquid injection equipment, 16-drilling machine, 17-hole sealing material, 18-liquid pumping equipment, 19-air pressure pump, 20-chamber, 21-connection lane and 22-working face transportation lane.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The embodiment provides a method for converting coal bed gas by using a novel catalyst, which comprises the following steps: (1) arranging a series of drilling sites on a coal seam to be mined, and arranging bedding drill holes on the coal seam through the drilling sites; (2) injecting a solution containing a catalyst into a coal seam to be mined along a drill hole by using a catalyst solution injection system, catalyzing gas in the coal seam into methanol and dissolving the methanol in the catalyst solution; (3) the catalyst solution containing the methanol is extracted from the coal bed through liquid extraction equipment, the methanol and the catalyst solution are separated through an underground separation system, the separated catalyst solution is injected into the coal body again, the catalyst solution is recycled, and the purified methanol solution is stored in a methanol storage tank.
Specifically, a catalyst drainage system is arranged in the track roadway chamber before gas extraction, as shown in fig. 1-2, and comprises a catalyst injection system, a liquid extraction device, a downhole separation system and a methanol storage tank 6. The catalyst injection system comprises raw material preparation equipment, mixing equipment, pumping equipment and liquid injection equipment 15, wherein the raw material preparation equipment comprises catalyst preparation equipment 14 and water supply equipment 13, the mixing equipment comprises a stirring pool 9 and a stirrer 10 and is used for mixing water and a catalyst, and the pumping equipment comprises a high-pressure pump 11 and a pumping controller 12 and is used for pumping a catalyst solution. The underground separation system comprises a separation device 8 and a purification device 7, wherein the separation device 8 is used for separating the catalyst from the reacted methanol solution, and the purification device 7 is used for purifying the methanol solution.
The output of equipment 14 is prepared to the catalyst and water supply equipment 13 communicates the feed end of stirring pond 9 respectively, and stirring pond 9 connects mixer 10, and the discharge gate of stirring pond passes through the entry of pipe connection high-pressure pump 11, and pipe connection notes liquid equipment 15 is passed through in the export of high-pressure pump 11, and notes liquid equipment 15 passes through the pipe connection and annotates the liquid mouth, and pumping controller 12 sets up on the pipeline between high-pressure pump 11 and notes liquid equipment 15, the entry of drawing liquid equipment 18 passes through the pipe connection and draws liquid mouth, and the exit linkage splitter 8 of drawing liquid equipment 18, the entry of the liquid phase exit linkage purification equipment 7 of splitter 8, the exit linkage methyl alcohol holding vessel 6 of purification equipment 7.
The catalyst solution injection system route is as follows: chamber → communication lane → rubber belt transportation lane → transportation mountain → working face transportation lane; the catalyst solution pumping system route is as follows: working face track lane → track mountain → track main lane → chamber, thereby forming a closed circulation system.
The method comprises the following specific steps:
(1) respectively injecting the catalyst and water into a stirring pool 9 by a catalyst preparation device 14 and a water supply device 13, turning on a switch of a stirrer 10 to fully mix the catalyst and the water to prepare a solution containing the catalyst, turning on a high-pressure pump 11 and a pumping controller 12, and injecting the solution containing the catalyst into the coal to be mined through a chamber 20, a connection roadway 21, a belt transportation main roadway 4, a transportation mountain 2 and a working face transportation roadway 22;
(2) arranging a series of drill sites on one side of a working face to be mined in advance, arranging bedding drill holes I, namely liquid injection holes, on the drill sites through a drilling machine 16, injecting a solution containing a catalyst into the working face to be mined through a liquid injection device 15, injecting fresh air into coal bodies through an air pressurizing pump 19 after liquid injection is completed, and sealing the liquid injection holes by using a hole sealing material 17 after the liquid injection is completed to prevent the solution containing the catalyst and air from flowing outwards;
(3) after reacting for a period of time, arranging a drill site and a bedding drilling hole II, namely a liquid pumping port, on the other side of the working face to be mined, pumping a methanol solution containing a catalyst by a liquid pumping device 18 through the drilling hole, sequentially delivering the methanol solution to a separation device 8 through a working face track roadway 3, a track ascending roadway 1, a track main roadway 5 and a chamber 20, separating the methanol solution from the catalyst by the separation device 8, re-injecting the catalyst into a stirring pool 9, further injecting the methanol separated by the separation device 8 into a purification device 7, increasing the concentration of the methanol, and storing the high-concentration methanol into a methanol storage tank 6.
The methanol is recovered from the methanol aqueous solution by generally adopting a rectification purification mode, and the purification equipment 7 is preferably rectification purification equipment.
Claims (5)
1. A method for converting coal bed gas by using a novel catalyst is characterized by comprising the following steps:
(1) arranging a series of drilling sites on a coal seam to be mined, and arranging bedding drill holes on the coal seam through the drilling sites;
(2) injecting a solution containing a catalyst into a coal seam to be mined along a drill hole through a catalyst injection system, directly oxidizing gas in the coal seam into methanol under the catalytic action, and dissolving the methanol in the catalyst solution, wherein the catalyst is an iridium catalyst containing a 2-methyl phenanthroline ligand;
(3) the methanol solution containing the catalyst is extracted from the coal bed through liquid extraction equipment, the catalyst and the methanol solution are separated through an underground separation system, the separated catalyst solution is injected into the coal body again, the catalyst is recycled, and the purified methanol solution is stored in a methanol storage tank.
2. The method for converting coal seam gas by using the novel catalyst is characterized in that the step (1) arranges a series of drilling sites in a driving roadway of a working face to be mined, and the concrete steps of arranging coal seam drilling holes are as follows: arranging a series of drilling sites on one side of a working face to be mined, and arranging a series of liquid injection holes in the drilling sites, wherein the liquid injection holes are used for injecting a solution containing a catalyst into a coal body and fully reacting with gas in the coal body; secondly, arranging a series of drilling sites on the other side of the working face to be mined, and arranging a series of liquid extraction holes in the drilling sites for extracting the catalyst solution which reacts with the coal gas to be completed.
3. The method for converting coal bed gas by using the novel catalyst according to claim 1, wherein the catalyst injection system in the step (2) comprises a raw material preparation device, a mixing device, a pumping device and a liquid injection device, the raw material preparation device comprises a catalyst preparation device and a water supply device, the mixing device comprises a mixing tank and a stirring machine, the pumping device comprises a high-pressure pump and a pumping controller, the output ends of the catalyst preparation device and the water supply device are respectively communicated with the feed end of the mixing tank, the mixing tank is connected with the stirring machine, the discharge port of the mixing tank is connected with the inlet of the high-pressure pump through a pipeline, the outlet of the high-pressure pump is connected with the liquid injection device through a pipeline, and the pumping controller is arranged on a pipeline between the high-pressure pump and the liquid injection device.
4. The method for converting coal bed gas by using the novel catalyst as claimed in claim 1, wherein the downhole separation system in the step (3) comprises a separation device and a purification device, an inlet of the separation device is connected with a liquid extraction device, a liquid phase outlet of the separation device is connected with an inlet of the purification device, and an outlet of the purification device is connected with a methanol storage tank.
5. The method for converting coal bed gas by using the novel catalyst as claimed in claim 4, wherein the purifying device is a rectification purifying device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398459.3A CN112554937B (en) | 2020-12-02 | 2020-12-02 | Method for converting coal bed gas by using novel catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398459.3A CN112554937B (en) | 2020-12-02 | 2020-12-02 | Method for converting coal bed gas by using novel catalyst |
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| Publication Number | Publication Date |
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| CN112554937A CN112554937A (en) | 2021-03-26 |
| CN112554937B true CN112554937B (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011398459.3A Active CN112554937B (en) | 2020-12-02 | 2020-12-02 | Method for converting coal bed gas by using novel catalyst |
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| CN113107580B (en) * | 2021-04-30 | 2022-05-10 | 中国矿业大学 | Device and method for absorbing air flow gas of return air roadway by using catalyst solution |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1261815B (en) * | 1964-05-18 | 1968-02-29 | Toa Gosei Kagaku Kogyo Kabushi | Process for extracting the mine gases trapped in coal layers and rock deposits in a coal mine |
| CN106979030A (en) * | 2017-04-07 | 2017-07-25 | 煤科集团沈阳研究院有限公司 | A kind of variable load extraction pipeline and pumping method based on catalyzing denaturing principle |
| CN110043767A (en) * | 2018-01-17 | 2019-07-23 | 韩国原子力技术株式会社 | System is arranged with catalyst for removing hydrogen body in tunnel internal setting |
| CN110439607A (en) * | 2019-09-10 | 2019-11-12 | 河南理工大学 | A kind of layer-through drilling separate type whole process gas drainage hole sealing device and method for sealing |
-
2020
- 2020-12-02 CN CN202011398459.3A patent/CN112554937B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1261815B (en) * | 1964-05-18 | 1968-02-29 | Toa Gosei Kagaku Kogyo Kabushi | Process for extracting the mine gases trapped in coal layers and rock deposits in a coal mine |
| CN106979030A (en) * | 2017-04-07 | 2017-07-25 | 煤科集团沈阳研究院有限公司 | A kind of variable load extraction pipeline and pumping method based on catalyzing denaturing principle |
| CN110043767A (en) * | 2018-01-17 | 2019-07-23 | 韩国原子力技术株式会社 | System is arranged with catalyst for removing hydrogen body in tunnel internal setting |
| CN110439607A (en) * | 2019-09-10 | 2019-11-12 | 河南理工大学 | A kind of layer-through drilling separate type whole process gas drainage hole sealing device and method for sealing |
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