A coal seam roadway cavitation water injection system

Abstract

The invention discloses a cavitation water injection system of a coal seam roadway. The cavitation water injection system comprises a pulse water injection subsystem and further comprises an air injection subsystem. A liquid outlet of the pulse water injection subsystem communicates with a coal seam to be subjected to water injection in a set area through a water injection pipe, and thus high-pressure pulse water is provided for the coal seam to be subjected to water injection in the area. The air injection subsystem injects air into the high-pressure pulse water to achieve cavitation water injection. The air is pressed into a pulse high-pressure water flow to achieve cavitation water injection, because of the corrosivity of continuous bubbles, cracks in the coal seam are corroded, the injection property of the coal seam is improved, and the cracks are promoted to be cracked and penetrate; and in addition, the diameters of air molecules are smaller than those of water molecules, thus the air molecules can enter thin and small holes which the water molecules cannot enter to conduct reaming, the purposes that the permeability of the coal seam is reinforced, and the gas concentrationin the coal seam is diluted can be achieved through the water molecules, and the purpose of full water injection is achieved.

Description

technical field [0001] The invention belongs to the technical field of coal seam roadway water injection system, and in particular relates to a coal seam roadway cavitation water injection system. Background technique [0002] The western region is an important coal production base in my country and shoulders the mission of ensuring my country's energy security. With the increase of mining depth, coal mines in this area are facing increasingly serious threat of rock burst. Coal seam water injection is a rock burst prevention method commonly used in coal mines in my country at present. The water injection pump provides high pressure to make groundwater enter the cracks and pores of the coal seam, soften the coal seam and transfer the high stress in the surrounding rock to the deep. For the mining of coal seams with impact tendency, coal seam water injection is a long-term process. In this process, the high-pressure water pump will consume a lot of electric energy. The water ...

AI Technical Summary

Problems solved by technology

For the mining of coal seams with impact tendency, coal seam water injection is a long-term process. In this process, the high-pressure water pump will consume a lot of electric energy. The water pump is generally located underground in the coal mine. Increased risk of gas explosions

In order to increase the amount of water injection, pulse water injection is generally used for water injection in coal seams with poor injectability. However, due to the frequent non-constant pressure of this water injection method, the penetration of coal seam cracks near the water injection end of the water injection pipe is often limited.

Patent 201110204015.6 discloses a coal seam water injection system, which adopts the pulse water injection method, but for coal seams with poor injectability, although the pulse water injection method can improve the water injection volume to a certain extent, it is still difficult to significantly improve the force condition of the roadway surrounding rock

In addition, for mining areas in western my country, water resources are extremely scarce and groundwater is less, which makes the prevention and control of coal seam rock burst in this area a challenge.

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