CN114320432B - 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
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- CN114320432B CN114320432B CN202210058736.9A CN202210058736A CN114320432B CN 114320432 B CN114320432 B CN 114320432B CN 202210058736 A CN202210058736 A CN 202210058736A CN 114320432 B CN114320432 B CN 114320432B
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- water injection
- coal
- coal seam
- mechanical wave
- wetting
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- 239000003245 coal Substances 0.000 title claims abstract description 121
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 238000002347 injection Methods 0.000 title claims abstract description 78
- 239000007924 injection Substances 0.000 title claims abstract description 78
- 238000009736 wetting Methods 0.000 title claims abstract description 50
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 238000000605 extraction Methods 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000001179 sorption measurement Methods 0.000 description 16
- 239000007864 aqueous solution Substances 0.000 description 6
- 239000002817 coal dust Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 230000002860 competitive effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 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
Images
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
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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
-
- 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
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- 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, which comprises the following steps: step 1, drilling a drilling hole on a working surface, pre-pumping gas, and plugging the drilling hole when the pressure and the content of the gas in a coal bed are reduced to a preset value; step 2, measuring the natural vibration frequency of the coal seam after pre-gas extraction; step 3, arranging at least one coal seam water injection wetting device on the working surface; and 4, adjusting the frequency of the mechanical wave resonance device to enable the coal bed to generate self vibration, and simultaneously opening the water injection device to perform water injection wetting on the coal bed. The water injection wetting effect can be improved.
Description
Technical Field
The application relates to the field of coal mining, in particular to a coal seam water injection wetting method based on mechanical wave resonance.
Background
In the related art, a large amount of coal dust can be generated during coal mining, so that the physical health of personnel is threatened, accidents such as coal dust explosion and the like can be possibly induced, and the safety production of a mine is seriously threatened. Coal seam water injection is one of important measures for dust prevention and dust suppression of coal and rock working surfaces. However, gas in coal can severely interfere with the water injection wetting effect: (1) most of the gas in the coal bed exists in the coal pores in an adsorption mode, a gas adsorption film can be formed on the surface of the coal, and then the wetting of water on the surface of the coal is prevented; (2) the gas molecules can form competitive adsorption with water molecules, occupy water molecule adsorption sites, and reduce the adsorption capacity of aqueous solution; (3) gas pressure can prevent the ingress of aqueous solutions and further reduce the wetting ability of the aqueous solutions.
Disclosure of Invention
The present application aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, the purpose of the application is to provide a coal seam water injection wetting method based on mechanical wave resonance, which can improve the water injection wetting effect.
In order to achieve the above object, the present application provides a method for wetting coal seam water injection based on mechanical wave resonance, the method for wetting coal seam water injection using a device for wetting coal seam water injection arranged on a working surface of the coal seam, the device for wetting coal seam water injection comprising a water injection device and a mechanical wave resonance device arranged on two holes on the working surface at a set distance, the method for wetting coal seam water injection comprising the following steps: step 1, drilling the drilling hole on the working surface, pre-pumping gas, and plugging the drilling hole when the pressure and the content of the gas in the coal seam are reduced to a preset value; step 2, measuring the natural vibration frequency of the coal seam after pre-gas extraction; step 3, arranging at least one coal seam water injection wetting device on the working surface; and 4, adjusting the frequency of the mechanical wave resonance device to enable the coal bed to generate self vibration, and simultaneously opening the water injection device to perform water injection wetting on the coal bed.
According to the coal seam water injection wetting method, high-pressure water injection can be realized under the condition of self-vibration of the coal seam through the cooperation of the mechanical wave resonance device and the water injection device, more hole cracks can be generated in the coal seam, the water permeation and adsorption are facilitated, and the effect of wetting the coal seam water injection is improved.
In addition, the coal seam water injection wetting method provided by the application can also have the following additional technical characteristics:
further, when gas is pre-extracted in the step 1, stopping gas extraction and plugging the drilling hole when the gas pressure in the coal seam is reduced to 0.74MPa and the gas content is reduced to 8 m/t.
Further, before measuring the natural vibration frequency of the coal seam in the step 2, sampling the coal seam after pre-gas extraction and preparing a coal sample.
Further, when the natural vibration frequency of the coal seam is measured in the step 2, the natural vibration frequency of the coal sample is measured by using a coal rock natural vibration frequency measuring device so as to represent the natural vibration frequency of the coal seam after pre-gas extraction.
Further, when the coal seam water injection wetting device is arranged in the step 3, two drilling holes with a distance of 8-10 meters are selected on the working surface, wherein one drilling hole is provided with the water injection device, and the other drilling hole is provided with the mechanical wave resonance device.
Further, the water injection device comprises a water injection pipeline extending into the drill hole, 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 step 4, the frequency of the mechanical wave resonance device is made to coincide with the natural frequency of the coal sample.
Further, a plurality of coal seam water injection wetting devices are arranged on the working surface at intervals of 8-10 meters.
Drawings
Exemplary embodiments of the present application will be described in detail below with reference to the attached drawings, and it should be understood that the embodiments described below are only for the purpose of explaining the present application and not limiting the scope of the present application, wherein:
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 apparatus according to an embodiment of the present application;
reference numerals:
1. roadway;
2. a coal seam;
3. a water injection device;
4. a mechanical wave resonance device;
20. a working surface;
21. drilling holes;
31. a water injection pipeline;
32. a pressure gauge;
33. a valve;
34. a high pressure water pipe;
35. a high pressure water pump;
36. a water tank;
41. a mechanical wave device;
42. a power amplifier;
42. a signal generator.
Detailed Description
Preferred embodiments of the present application are described in detail below with reference to examples. However, those skilled in the art will appreciate that these exemplary embodiments are not meant to be limiting in any way. Furthermore, features in embodiments of the present application may be combined with each other without conflict. In the different drawings, the same components are denoted by the same reference numerals, and other components are omitted for brevity, but this does not indicate that other components may not be included. It should be understood that the dimensions, proportions, and number of parts of the figures are not limiting of the present application.
As shown in fig. 1 and 2, a method for wetting coal seam by injecting water according to an embodiment of the present application uses a device for wetting coal seam by injecting water disposed on a working surface 20 of coal seam 2, wherein the device for wetting coal seam by injecting water includes a water injecting device 3 and a mechanical wave resonance device 4 disposed on two holes 21 spaced apart from each other by a set distance on the working surface 20, and the method for wetting coal seam by injecting water includes the following steps: step 1, drilling a drilling hole 21 on a working surface 20, pre-pumping gas, and plugging the drilling hole 21 when the pressure and the content of the gas in a coal bed 2 are reduced to a preset value; step 2, measuring the natural vibration frequency of the coal bed 2 after pre-gas extraction; step 3, arranging at least one coal seam water injection wetting device on the working surface 20; and 4, adjusting the frequency of the mechanical wave resonance device 4 to enable the coal bed 2 to generate self vibration, and simultaneously opening the water injection device 3 to perform water injection wetting on the coal bed 2.
In the related art, a large amount of coal dust can be generated during coal mining, so that the physical health of personnel is threatened, accidents such as coal dust explosion and the like can be possibly induced, and the safety production of a mine is seriously threatened. Coal seam water injection is one of important measures for dust prevention and dust suppression of coal and rock working surfaces. However, gas in coal can severely interfere with the water injection wetting effect: (1) most of the gas in the coal bed exists in the coal pores in an adsorption mode, a gas adsorption film can be formed on the surface of the coal, and then the wetting of water on the surface of the coal is prevented; (2) the gas molecules can form competitive adsorption with water molecules, occupy water molecule adsorption sites, and reduce the adsorption capacity of aqueous solution; (3) gas pressure can prevent the ingress of aqueous solutions and further reduce the wetting ability of the aqueous solutions.
Therefore, the coal seam water injection wetting method 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, more hole cracks can be generated in the coal seam 2, water permeation and adsorption are facilitated, and the water injection wetting effect of the coal seam 2 is improved.
By drilling the drilling holes 21 in the working surface 20 of the coal seam 2 and pre-pumping the gas from the coal seam 2 through the drilling holes 21, the gas pressure and the gas content in the coal seam 2 are reduced to a preset value, for example, the gas pressure is reduced to below 0.74MPa, and the gas content is reduced to below 8 m/t, so that the permeation and adsorption of water can be promoted 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, two drilling holes 21 with a set distance are selected on the working surface 20, for example, the two drilling holes 21 are 8-10 meters away, the water injection device 3 is arranged on one drilling hole 21, the mechanical wave resonance device 4 is arranged on the other drilling hole 21, the frequency of the mechanical wave resonance device 4 is adjusted to be consistent with the natural vibration frequency of the coal seam 2, the coal seam 2 generates natural vibration under the excitation of the mechanical wave resonance device 4, more porous cracks are generated in the coal seam 2, and the water injection device 3 injects water into the drilling holes 21 under the condition of the natural vibration of the coal seam 2, so that the penetration and adsorption of water are facilitated, and the water injection wetting effect on the coal seam 2 can be improved.
According to an embodiment of the application, before measuring the natural vibration frequency of the coal seam 2, the coal seam 2 after the pre-gas extraction treatment is sampled and made into a coal sample, for example, the size of the coal sample is 7 x 10cm, the texture of the coal sample is uniform, then the natural vibration frequency of the coal sample is measured by using a coal rock natural vibration frequency measuring device, and the natural vibration frequency of the coal sample can be used for representing the natural vibration frequency of the coal seam 2.
According to an embodiment of the present application, the water injection device 3 comprises a water injection pipeline 31, a high pressure water pump 35 and a water tank 36, wherein the water injection pipeline 31 is inserted into the borehole 21, the water injection pipeline 31 is communicated with the water tank 36 through the high pressure water pipe 34, the high pressure water pump 35 is arranged on the high pressure water pipe 35 for pumping water in the water tank 36 into the borehole 21 through the water injection pipeline 31, and as an example, a pressure gauge 32 and a valve 33 are further arranged on the high pressure water pipe 35 between the high pressure water pump 35 and the water injection pipeline 35.
According to an 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, where the mechanical wave device 41 is in the prior art, and the mechanism and working mechanism of the mechanical wave device 41 are not repeated, the mechanical wave device 41 is configured on the borehole 21, the power amplifier 42 amplifies the signal input by the signal generator 43 into the mechanical wave device 41, and the frequency of the mechanical wave device 41 is adjusted to be consistent with the measured frequency of the coal sample, so that the coal seam 2 can generate self-vibration, and further more hole cracks are generated in the coal seam 2, which is beneficial to water penetration and adsorption.
Optionally, the coal seam water injection wetting device is arranged on the working surface 20 at intervals of 8-10 meters, so that the working efficiency can be improved.
According to the coal seam water injection wetting method, high-pressure water injection can be realized under the condition of self-vibration of the coal seam through the cooperation of the mechanical wave resonance device and the water injection device, more hole cracks can be generated in the coal seam, the water permeation and adsorption are facilitated, and the effect of wetting the coal seam water injection is improved.
Although embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (2)
1. The method is characterized in that a coal seam water injection wetting device arranged on a working surface of a coal seam is adopted to carry out water injection wetting on the coal seam, the coal seam water injection wetting device comprises a water injection device and a mechanical wave resonance device which are arranged on two holes with a set distance on the working surface, and the method comprises the following steps:
step 1, drilling the drilling hole on the working surface, pre-pumping gas, and plugging the drilling hole when the pressure and the content of the gas in the coal seam are reduced to a preset value; when the gas is pre-extracted, stopping gas extraction and plugging the drilling hole when the gas pressure in the coal seam is reduced to 0.74MPa and the gas content is reduced to 8 m/t;
step 2, measuring the natural vibration frequency of the coal seam after pre-gas extraction; sampling the coal bed after pre-gas extraction and preparing a coal sample before measuring the natural vibration frequency of the coal bed; when the natural vibration frequency of the coal bed is measured, measuring the natural vibration frequency of the coal sample by using a coal rock natural vibration frequency testing device to represent the natural vibration frequency of the coal bed after pre-gas extraction;
step 3, arranging at least one coal seam water injection wetting device on the working surface; when the coal seam water injection wetting device is arranged, two drilling holes with a distance of 8-10 meters are selected on the working surface, wherein one drilling hole is provided with the water injection device, and the other drilling hole is provided with the mechanical wave resonance device;
step 4, adjusting the frequency of the mechanical wave resonance device to enable the coal bed to generate self-vibration, and simultaneously opening the water injection device to perform water injection wetting on the coal bed; when the frequency of the mechanical wave resonance device is regulated, the frequency of the mechanical wave resonance device is consistent with the natural vibration frequency of the coal sample;
the water injection device comprises a water injection pipeline extending into the drill hole, a high-pressure water pump and a water tank; the water injection pipeline is inserted into the drill hole, the water injection pipeline is communicated with the water tank through a high-pressure water pipe, the high-pressure water pump is arranged on the high-pressure water pipe and used for pumping water in the water tank into the drill hole through the water injection pipeline, and the high-pressure water pipe between the high-pressure water pump and the water injection pipeline (31) is also provided with a pressure gauge and a valve;
the mechanical wave resonance device comprises a mechanical wave device, a power amplifier and a signal generator, wherein the mechanical wave device is arranged on a drill hole, the power amplifier amplifies a signal input by the signal generator into the mechanical wave device, and the frequency of the mechanical wave device is adjusted to be consistent with the frequency of a measured coal sample, so that the coal bed generates self-vibration, and further more hole cracks are generated in the coal bed.
2. A method of coal seam injection wetting based on mechanical wave resonance as claimed in claim 1, wherein a plurality of the coal seam injection wetting devices are arranged on the working surface at intervals of 8-10 meters.
Priority Applications (2)
| 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 |
| LU502620A LU502620B1 (en) | 2022-01-19 | 2022-08-02 | Coal seam water injection wetting method based on mechanical wave resonance |
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 |
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| Publication Number | Publication Date |
|---|---|
| CN114320432A CN114320432A (en) | 2022-04-12 |
| CN114320432B true CN114320432B (en) | 2023-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210058736.9A Active CN114320432B (en) | 2022-01-19 | 2022-01-19 | 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 |
| LU502620B1 (en) | 2023-02-02 |
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