LU502620B1 - Coal seam water injection wetting method based on mechanical wave resonance - Google Patents
Coal seam water injection wetting method based on mechanical wave resonance Download PDFInfo
- Publication number
- LU502620B1 LU502620B1 LU502620A LU502620A LU502620B1 LU 502620 B1 LU502620 B1 LU 502620B1 LU 502620 A LU502620 A LU 502620A LU 502620 A LU502620 A LU 502620A LU 502620 B1 LU502620 B1 LU 502620B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- coal seam
- water injection
- mechanical wave
- wave resonance
- coal
- Prior art date
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- 239000003245 coal Substances 0.000 title claims abstract description 130
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 238000002347 injection Methods 0.000 title claims abstract description 85
- 239000007924 injection Substances 0.000 title claims abstract description 85
- 238000009736 wetting Methods 0.000 title claims abstract description 55
- 238000005086 pumping Methods 0.000 claims abstract description 14
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 239000011435 rock Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 description 16
- 239000007864 aqueous solution Substances 0.000 description 6
- 230000035515 penetration Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000002817 coal dust Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000002860 competitive effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000009545 invasion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001881 scanning electron acoustic microscopy Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The application provides a coal seam water injection wetting method based on mechanical wave resonance, and comprises the following steps: S1, drilling the drilling hole on the working surface, pre-pumping gas, and plugging the drilling hole when the pressure and content of Nevas in the coal seam drop to a predetermined value; S2, measuring the natural vibration frequency of the coal seam after gas pre-pumping; S3, arranging at least one coal seam water injection wetting device on the working face; S4, adjusting the frequency of the mechanical wave resonance device to make the coal seam vibrate naturally, and simultaneously opening the water injection device to wet the coal seam with water. The application can improve the wetting effect of water injection.
Description
DESCRIPTION LU502620
COAL SEAM WATER INJECTION WETTING METHOD BASED ON
MECHANICAL WAVE RESONANCE
The application relates to the field of coal mining, in particular to a coal seam water injection wetting method based on mechanical wave resonance.
In related technologies, coal mining will produce a large amount of coal dust, which not only threatens people's health, but also may induce coal dust explosion and other accidents, seriously threatening mine safety production. Coal seam water injection is one of the important measures to prevent and suppress dust in coal face. However, the gas in coal will seriously interfere with the wetting effect of water injection: (1) most of the gas in the coal seam exists in the coal pores in the form of adsorption, which will form a gas adsorption film on the coal surface, thus hindering the wetting of the coal surface by water; (2) gas molecules will form competitive adsorption with water molecules, seize the adsorption sites of water molecules, and reduce the adsorption capacity of aqueous solution; (3) the gas pressure will hinder the invasion of aqueous solution and further reduce the wetting ability of aqueous solution.
This application aims at solving one of the technical problems in related technologies at least to some extent.
Therefore, the purpose of this application is to propose a coal seam water injection wetting method based on mechanical wave resonance, which can improve the effect of water injection wetting.
In order to achieve the above object, this application provides a coal seam water injection wetting method based on mechanical wave resonance, characterized in that the coal seam water injection wetting method uses a coal seam water injection wetting device arranged on thé&J502620 working surface of the coal seam to wet the coal seam with water, the coal seam water injection wetting device comprises a water injection device and a mechanical wave resonance device which are arranged on two boreholes with a set distance on the working surface, and the coal seam water injection wetting method comprises the following steps: S1, drilling the drilling hole on the working surface, pre-pumping gas, and plugging the drilling hole when the pressure and content of Nevas in the coal seam drop to a predetermined value; S2, measuring the natural vibration frequency of the coal seam after gas pre-pumping; S3, arranging at least one coal seam water injection wetting device on the working face; S4, adjusting the frequency of the mechanical wave resonance device to make the coal seam vibrate naturally, and simultaneously opening the water injection device to wet the coal seam with water.
According to the coal seam water injection wetting method proposed in this application, through the cooperation of the mechanical wave resonance device and the water injection device, high-pressure water injection can be realized under the condition of coal seam self-vibration, and more holes and fissures will be generated in the coal seam, which is beneficial to the penetration and adsorption of water and improves the water injection wetting effect of the coal seam.
In addition, the coal seam water injection wetting method proposed in this application can also have the following additional technical features:
Further, in S1, when the gas pressure in the coal seam is reduced to 0.74 MPa and the gas content is reduced to 8 m°/t, stopping gas extraction and plugging the borehole.
Further, before measuring the natural vibration frequency of the coal seam in S2, sampling the coal seam after pre-pumping gas and making into a coal sample.
Further, when measuring the natural vibration frequency of the coal seam in S2, using the coal and rock natural vibration frequency testing device to measure the natural vibration frequency of the coal sample to indicate the natural vibration frequency of the coal seam after gas pre-pumping.
Further, when arranging the coal seam water injection wetting device in S3, selecting two boreholes with a distance of 8-10 m on the working face, wherein one borehole is provided with the water injection device, and the other borehole is provided with the mechanical wave resonance device.
Further, the water injection device comprises a water injection pipeline extending into thé&J502620 borehole, a high-pressure water pump and a water tank.
Further, the water injection device also comprises a pressure gauge and a valve.
Further, the mechanical wave resonance device comprises a mechanical wave device, a power amplifier and a signal generator.
Further, when the frequency of the mechanical wave resonance device is adjusted in S4, the frequency of the mechanical wave resonance device is consistent with the natural vibration frequency of the coal sample.
Further, coal seam water injection wetting devices are arranged on the working surface at intervals of 8-10 m.
Exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the following described embodiments are only used to explain the application, but not to limit the scope of the application, in which:
Fig. 1 is a flow chart of a coal seam water injection wetting method according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a coal seam water injection wetting device according to an embodiment of the present application; 1. roadway; 2. coal seam; 3. water injection device; 4. mechanical wave resonance device; 20. working surface; 21. drilling; 31. water injection pipeline; 32. pressure gauge; 3. valve; 34. high-pressure water pipes;
35. high pressure water pump; LU502620 36. water tank: 41. mechanical wave device: 42. power amplifier; 42. signal generator.
The preferred embodiments of this application will be described in detail with the following examples. However, it should be understood by those skilled in the art that these exemplary embodiments are not meant to form any restrictions on this application. In addition, the features in the embodiments of the present application can be combined with each other without conflict.
In different drawings, the same parts are denoted by the same reference numerals, and other parts are omitted for brevity, but this does not mean that other parts cannot be included. It should be understood that the dimensions, proportions and numbers of components in the drawings are not taken as limitations on the application.
As shown in Figs. 1 and 2, the coal seam water injection wetting method according to the embodiment of the present application uses a coal seam water injection wetting device arranged on the working surface 20 of the coal seam 2 to wet the coal seam 2 with water, the coal seam water injection wetting device comprises a water injection device 3 and a mechanical wave resonance device 4 which are arranged on two boreholes 21 with a set distance on the working surface 20. The coal seam water injection wetting method comprises the following S1, drilling a borehole 21 on a working surface 20 and pre-pumping gas, and plugging the borehole 21 when the Nevas pressure and content of a coal seam 2 drop to a predetermined value; S2, measuring the natural frequency of the coal seam 2 after pre-pumping gas; S3, arranging at least one coal seam water injection wetting device on the working face 20; S4: adjust the frequency of the mechanical wave resonance device 4 to make the coal seam 2 vibrate, and at the same time open the water injection device 3 to wet the coal seam 2 with water.
In related technologies, coal mining will produce a large amount of coal dust, which not only threatens people's health, but also may induce coal dust explosion and other accidents, seriously threatening mine safety production. Coal seam water injection is one of the important measures to prevent and suppress dust in coal face. However, the gas in coal will seriouslyJ502620 interfere with the wetting effect of water injection: (1) most of the gas in coal seam exists in coal pores in the form of adsorption, which will form a gas adsorption film on the coal surface, thus hindering the wetting of coal surface by water, (2) gas molecules will form competitive adsorption with water molecules, seize the adsorption sites of water molecules, and reduce the adsorption capacity of aqueous solution; (3) the gas pressure will hinder the invasion of aqueous solution and further reduce the wetting ability of aqueous solution.
Therefore, the coal seam water injection wetting method of the application can realize high-pressure water injection under the condition of self-vibration of the coal seam 2 through the cooperation of the water injection device 3 and the mechanical wave resonance device 4, and more holes and fissures will be generated in the coal seam 2, which is beneficial to the penetration and adsorption of water and improves the water injection wetting effect of the coal seam 2.
Drilling a hole 21 on the working face 20 of the coal seam 2 and pre-pumping the coal seam 2 through the hole 21 can reduce the Nevas pressure and content of the coal seam 2 to a predetermined value, for example, the gas pressure is reduced below 0.74 MPa and the gas content is reduced below 8 m°/t, which can promote the penetration and adsorption of water to a certain extent.
In addition, the coal seam water injection wetting device comprises a water injection device 3 and a mechanical wave resonance device 4, and two boreholes 21 with a set distance are selected on the working surface 20. For example, the distance between two boreholes 21 is 8-10 meters. One borehole 21 is equipped with a water injection device 3, and the other borehole 21 is equipped with a mechanical wave resonance device 4. The frequency of the mechanical wave resonance device 4 is adjusted to be consistent with the natural frequency of the coal seam 2. The coal seam 2 generates natural vibration under the excitation of the mechanical wave resonance device 4, resulting in more holes and cracks in the coal seam 2. Under the condition of natural vibration of the coal seam 2, the water injection device 3 injects water into the boreholes 21, which is beneficial to water penetration and adsorption.
According to one embodiment of the present application, before measuring the natural frequency of coal seam 2, the coal seam 2 after pre-pumping gas treatment is sampled and made into a coal sample, for example, the size of the coal sample is 7*10*10cm, and the quality of thé&J502620 coal sample is uniform. Then, the natural frequency of the coal sample is measured by using a coal rock natural frequency testing device, and the natural frequency of the coal sample can represent the natural frequency of the coal seam 2.
According to one embodiment of the present application, the water injection device 3 includes a water injection pipeline 31, a high-pressure water pump 35 and a water tank 36. The water injection pipeline 31 is inserted into the borehole 21, and the water injection pipeline 31 communicates with the water tank 36 through a high-pressure water pipe 34. The high-pressure water pump 35 is arranged on the high-pressure water pipe 35 to pump the water in the water tank 36 into the borehole 21 through the water injection pipeline 31. As an example, a pressure gauge 32 and a valve 33 are also arranged on the high-pressure water pipe 35 between the high-pressure water pump 35 and the water injection pipeline 35.
According to one embodiment of the present application, the mechanical wave resonance device 4 includes a mechanical wave device 41, a power amplifier 42 and a signal generator 43, wherein the mechanical wave device 41 is the prior art, and its mechanism and working mechanism will not be described again. The mechanical wave device 41 is arranged on the borehole 21, and the power amplifier 42 amplifies the signal input by the signal generator 43 into the mechanical wave device 41. By adjusting the frequency of the mechanical wave device 41 to make it consistent with the measured frequency of the coal sample, the coal seam 2 can generate self-vibration, and then more holes and cracks can be generated in the coal seam 2, which is beneficial to the penetration and adsorption of water.
Optionally, the coal seam water injection wetting device is arranged on the working surface at intervals of 8-10 meters, which can improve the working efficiency.
According to the coal seam water injection wetting method proposed in this application, through the cooperation of the mechanical wave resonance device and the water injection device, high-pressure water injection can be realized under the condition of coal seam self-vibration, and more holes and fissures will be generated in the coal seam, which is beneficial to the penetration and adsorption of water and improves the water injection wetting effect of the coal seam.
Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and should not be construed as limitations of the present application, and those skilled in the art can make changdsU502620 modifications, substitutions and variations to the above embodiments within the scope of the present application.
Claims (10)
1. A coal seam water injection wetting method based on mechanical wave resonance, characterized in that the coal seam water injection wetting method uses a coal seam water injection wetting device arranged on the working surface of the coal seam to wet the coal seam with water; the coal seam water injection wetting device comprises a water injection device and a mechanical wave resonance device which are arranged on two boreholes with a set distance on the working surface, and the coal seam water injection wetting method comprises the following steps: S1, drilling the drilling hole on the working surface, pre-pumping gas, and plugging the drilling hole when the pressure and content of Nevas in the coal seam drop to a predetermined value; S2, measuring the natural vibration frequency of the coal seam after gas pre-pumping; S3, arranging at least one coal seam water injection wetting device on the working face; S4, adjusting the frequency of the mechanical wave resonance device to make the coal seam vibrate naturally, and simultaneously opening the water injection device to wet the coal seam with water.
2. The coal seam water injection wetting method based on mechanical wave resonance according to claim 1, characterized in that in S1, when the gas pressure in the coal seam is reduced to 0.74 MPa and the gas content is reduced to 8 m°/t, stopping gas extraction and plugging the borehole.
3. The coal seam water injection wetting method based on mechanical wave resonance according to claim 2, characterized in that before measuring the natural vibration frequency of the coal seam in S2, sampling the coal seam after pre-pumping gas and preparing a coal sample.
4. The coal seam water injection wetting method based on mechanical wave resonance according to claim 3, characterized in that when measuring the natural vibration frequency of the coal seam in S2, using the coal and rock natural vibration frequency testing device to measure the natural vibration frequency of the coal sample to indicate the natural vibration frequency of the coal seam after gas pre-pumping.
5. The coal seam water injection wetting method based on mechanical wave resonant&#/502620 according to claim 4, characterized in that when arranging the coal seam water injection wetting device in S3, selecting two boreholes with a distance of 8-10 m on the working face, wherein one borehole is provided with the water injection device, and the other borehole is provided with the mechanical wave resonance device.
6. The coal seam water injection wetting method based on mechanical wave resonance according to claim 5, characterized in that the water injection device comprises a water injection pipeline extending into the borehole, a high-pressure water pump and a water tank.
7. The coal seam water injection wetting method based on mechanical wave resonance according to claim 6, characterized in that the water injection device also comprises a pressure gauge and a valve.
8. The coal seam water injection wetting method based on mechanical wave resonance according to claim 7, characterized in that the mechanical wave resonance device comprises a mechanical wave device, a power amplifier and a signal generator.
9. The coal seam water injection wetting method based on mechanical wave resonance according to claim 8, characterized in that when the frequency of the mechanical wave resonance device is adjusted in S4, the frequency of the mechanical wave resonance device is consistent with the natural vibration frequency of the coal sample.
10. The coal seam water injection wetting method based on mechanical wave resonance according to claim 9, characterized in that the coal seam water injection wetting devices are arranged on the working surface at intervals of 8-10 m.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210058736.9A CN114320432B (en) | 2022-01-19 | 2022-01-19 | Coal seam water injection wetting method based on mechanical wave resonance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU502620B1 true LU502620B1 (en) | 2023-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU502620A LU502620B1 (en) | 2022-01-19 | 2022-08-02 | Coal seam water injection wetting method based on mechanical wave resonance |
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| CN (1) | CN114320432B (en) |
| LU (1) | LU502620B1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2067181C1 (en) * | 1992-01-16 | 1996-09-27 | Научно-производственная фьючерская фирма "Геоэнергия" | Method for decrease of gas dynamic activity of outburst-prone seams |
| CN102889094B (en) * | 2011-07-20 | 2015-02-25 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Coal seam water injection system |
| CN105510396B (en) * | 2015-11-24 | 2018-06-29 | 山东科技大学 | A kind of test device and test method for coal-bed flooding wetting range |
| CN106703871B (en) * | 2017-02-06 | 2019-03-01 | 华北科技学院 | A kind of method of high pressure water injection prevention and treatment gas and coal dust |
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- 2022-01-19 CN CN202210058736.9A patent/CN114320432B/en active Active
- 2022-08-02 LU LU502620A patent/LU502620B1/en active IP Right Grant
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| CN114320432A (en) | 2022-04-12 |
| CN114320432B (en) | 2023-06-13 |
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| Date | Code | Title | Description |
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| FG | Patent granted |
Effective date: 20230202 |