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Method and apparatus for preventing and controlling coal or rock dynamic disaster by high-pressure pulse water injection

A dynamic disaster, high-pressure water technology, applied in safety devices, mining equipment, earth-moving drilling, etc., can solve problems such as unsatisfactory anti-outburst and anti-impact effects, complex processes, etc., to improve the safety production factor and expand the wetting radius. , the effect of eliminating the danger

Inactive Publication Date: 2009-09-23
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0004] Although the above-mentioned prior art has solved some problems to a certain extent and reduced the occurrence of coal-rock dynamic disasters, it has at least the following disadvantages: the process is relatively complicated, and the anti-burst and anti-shock effects are not ideal. How to further improve the water injection technology and improve the prevention The sudden and anti-shock effect just becomes the problem to be solved in the present invention

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  • Method and apparatus for preventing and controlling coal or rock dynamic disaster by high-pressure pulse water injection

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Embodiment Construction

[0020] The method for preventing and controlling coal-rock dynamic disasters by high-pressure pulsating water injection according to the present invention, at first, drill holes from the mine roadway to the coal seam of the mine, usually two holes; then, inject the pulsating high-pressure water into the drill holes of the coal seam of the mine After the pulsating high-pressure water enters the coal seam, it can not only penetrate into different cracks and pores, increase the wettability of the coal body, but also make the cracks continuously penetrate and expand, expand the wetting radius, and change the physical and mechanical properties of the coal seam. At the same time, the periodic The pulsating high-pressure water can also produce repeated effects of "expansion-contraction-expansion" on coal cracks and pores, reducing or eliminating the risk of coal seam outburst. During water injection, the maximum pressure of the pulsating high-pressure water is 25MPa, and the pulsating...

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Abstract

The invention discloses a method and an apparatus for preventing and controlling coal or rock dynamic disaster by high-pressure pulse water injection. The apparatus comprises a high-pressure water supply system, a pulse pressure water output system and a pneumatic frequency modulation control system. The pulse pressure water output system is controlled by the pneumatic frequency modulation control system and injects high-pressure water in boreholes in a pulsation manner. Water injection pressure is changed such that water filters into different gaps and pores by injecting pulse high-pressure water in coal beds, namely, by injecting water with the pressure changed periodically, so as to change the mechanical property of the coal body furthest. The pulse high-pressure water is used for discharging free high-pressure mash gas so as to reduce mash gas content in the coal body, improve safety, and reduce or eliminate coal bed outburst and shock hazard. The invention has a simple technology and good control efficiency, and is suitable for preventing and controlling coal or rock dynamic disaster in all coal mines.

Description

technical field [0001] The invention relates to a technology for preventing and controlling coal mine safety production, in particular to a method and equipment for preventing and controlling coal-rock dynamic disasters by high-pressure pulsating water injection. Background technique [0002] In the process of coal mine production, the occurrence of coal and rock dynamic disasters such as coal and gas outburst and impact mine pressure often cause a large number of casualties and bring great mental and psychological pressure to mine workers. At the same time, it will also affect the safety of coal mines economic benefits. In recent years, with the increase of mine mining depth and intensity, coal-rock dynamic disasters have increased year by year and become more serious, which has become a problem that needs to be solved first in current coal mines. [0003] In the existing mine outburst prevention technology, many hydraulic measures are being promoted and applied, which are...

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Application Information

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IPC IPC(8): E21F7/00
Inventor 聂百胜何学秋
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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