A method of promoting gas drainage based on electrothermal effect

Abstract

A method for promoting gas drainage based on the electrothermal effect disclosed by the present invention, first constructs a gas drainage hole with a diameter of 120-130 mm and a coal seam preheating hole with a diameter of 30-50 mm inside the coal seam; sends the thermal resistance to the coal seam for preheating Inside the thermal hole, use wires to connect the thermal resistor to the power supply, control the current change of the circuit through the sliding resistor, and the current heats the thermal resistor; use the conventional drilling and sealing method to seal the gas drainage drilling to ensure that the gas drainage pipe Expose the front end of the sealing material for 3-5m, and use the valve to connect the gas extraction pipe with the underground gas pipeline for gas extraction. The coal seam receives heat, and the temperature rises, so that the gas adsorbed in the coal seam is desorbed into free gas, which promotes gas extraction. extraction. By implementing the method of promoting gas drainage based on the electrothermal effect, the area affected by gas desorption is increased, and the concentration of gas extracted is increased.

Description

technical field [0001] The invention relates to a method for promoting gas drainage based on an electrothermal effect, which belongs to the technical field of regional gas control in underground coal mines, and is especially suitable for the gas drainage operation of regional gas control in high-adsorption gas and low-permeability coal seams. Background technique [0002] The geological conditions of my country's coal mines are complex, high-gas coal seams account for 50%-70%, and high-gas low-permeability coal seams account for about 70% of them. With the efficient intensification of coal production and the increase of mining depth, the amount of gas gushing out is increasing, and the threat of gas explosion and gas outburst is becoming more and more serious. At present, the fundamental method to prevent and control coal mine gas disasters is to carry out gas drainage. The coal mine gas management policy of "draining first, then mining, monitoring and monitoring, and wind ...

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Problems solved by technology

[0003] However, the above methods are likely to cause local stress concentration, inhibit gas desorption, coal and rock movement, and even induce coal and gas outburst and other negative effects

The main reason is that after the implementation of traditional hydraulic technology, the existence of water blocks the gas flow channel, which inhibits gas desorption, diffusion and infiltration, resulting in unsatisfactory gas drainage effects and effective suppression of gas disaster coal samples; loose blasting is easy Induce the sudden release of gas, causing secondary gas disasters

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