Device and method for displacing, exhausting and mining coal seam gas by damp and hot water injection

Abstract

The invention relates to a device and a method for displacing, exhausting and mining coal seam gas by damp and hot water injection. The device comprises a high and low pressure water injection device, a high-pressure-resistant explosion-proof heating device and a gas exhausting and mining device, wherein the high and low pressure water injection device comprises a water storage tank, a water pump motor, a flow meter, a high-pressure water pump and a high-pressure water pipe; the high-pressure-resistant explosion-proof heating device comprises an explosion-proof shell, a heating module, a control circuit board, ceramic asbestos filling and a quick coupler; the gas exhausting and mining device comprises a main pipe for exhausting and mining, an exhausting and mining hose and an exhausting and mining branch pipe. According to the whole device, the purposes of coal seam gas displacement by injection of high-temperature water and superheated water under high or low pressure, coal body temperature and moisture increasing and gas exhausting and mining efficiency improvement can be realized, mine and gas outburst prevention and cure and dust prevention can be integrated, and the device is simple to operate. Especially for a low-permeability coal seam or situations that gas content is high after the coal seam is exhausted and mined for a period of time and the gas is difficult to exhaust and mine, purposes that the gas content of the coal seam of an exhausting and mining area can be quickly lowered and the outburst is eliminated in short time can be realized.

Description

technical field [0001] The invention relates to a device and method for damp heat water injection displacement and coal seam gas extraction, especially suitable for low gas permeability coal seams or the situation that the gas content of the coal seam remains high after a period of time of extraction, and can quickly realize the reduction of the extraction area The gas content of the coal seam can be reduced to achieve the purpose of outburst elimination in a short time. Background technique [0002] Coal and gas outburst is one of the most serious disasters in coal mines. Coal and gas outburst is mainly the result of the sudden release of internal energy of gas due to the sudden breaking of coal body due to ground stress. The coal body is a porous structure and the gas molecules exist in the pores and cracks of the coal in the state of adsorption and dissociation. It has been proved that as the water content of the coal body increases, the elasticity of the coal body decrea...

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Problems solved by technology

Outburst coal seams are basically hard-to-drain coal seams, the influence radius of drainage is small, and the extraction efficiency is low

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