Device and method for alternating reinforced water injection permeation strengthening and wetting of low-porosity coal seam

Abstract

The invention provides a device and method for alternating reinforced water injection permeation strengthening and wetting of a low-porosity coal seam. The device comprises a dynamic pressure water injection device, a high-pressure water injection rubber hose, a flow divider and a water injection drill hole, wherein the dynamic pressure water injection device comprises a water tank, an injection pump, a motor, a water injection frequency converter and a water outlet end which are connected in sequence; a shut-off valve is arranged between the water outlet end and the high-pressure water injection rubber hose, and the high-pressure water injection rubber hose is connected with the water injection drill hole through the flow divider. A plurality of water injection drill holes are formed in acoal seam area not affected by mining, and pipe laying and hole sealing are carried out; the dynamic pressure water injection device is connected to one water injection drill hole or above through the high-pressure water injection rubber hose and the flow divider to carry out alternating reinforced water injection permeation strengthening and wetting on the coal seam, so that under the impact ofhigh and low alternating cyclic water pressure, obvious fatigue damage of a coal body is generated, the pores and fractures of the alternating reinforced water-injected coal body are increased, then pressurized water penetrates into a coal matrix along the pores and the fractures, and finally, the purpose of improving the effects of wetting, dust suppression and scour prevention of coal seam waterinjection is achieved.

Description

technical field [0001] The invention relates to the field of disaster prevention and control in coal mining face, in particular to a device and a method for alternately strengthening water injection, infiltration and wetting of low-porosity coal seams. Background technique [0002] my country is a country where coal is the main energy source. According to statistics, coal accounts for more than 70% of my country's energy production and consumption. At present, on the whole, China's coal resources are insufficient, and coal resources in old mining areas are gradually shrinking. With the development of science and technology and the progress of human society, the demand for energy is also more urgent, and the depth and difficulty of coal mining are also becoming more and more difficult. The more prominent it is, the mines in various countries have gradually shifted to the stage of deep mining. After the mine enters deep mining, the shallow mining environment, the problems of ...

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Problems solved by technology

[0004] Aiming at the difficulty of water injection in low-porosity and low-permeability coal seams, the present invention provides a low-porosity coal seam alternately enhanced water injection and seepage enhancement and wetting device, which uses a water injection frequency converter to inject water into coal seam areas that are not affected by mining; Another object of the present invention is to provide a method for alternately strengthening water injection to increase seepage and wetting of low-porosity coal seams, and proposes to use alternating cycle hydraulic impact to cause fatigue damage to water-injected coal bodies and force the pores and cracks of low-porosity coal bodies Expansion and penetration, increase the permeability of the coal seam, increase the amount of water injection in the coal seam, thereby forming an alternating enhanced water injection to increase seepage and wet the coal seam, and improve the effect of water injection in the coal seam to suppress dust and prevent scour

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