Coal seam weakening anti-reflection device and method based on microwave-assisted pre-cracking and high-voltage pulse

Abstract

The invention discloses a coal seam weakening and anti-reflection device and method in cooperation with microwave-assisted pre-splitting and high-voltage pulses, and relates to the technical field of coal mine gas prevention and control. The method first drills a hole in the coal seam, and connects the microwave antenna to the innermost end of the coaxial waveguide and sends it into the fracturing drill hole; then turns on the microwave generator and radiates the drill hole through the microwave antenna; then injects Conductive ionic solution until the coal seam is soaked; finally, it is discharged through adjustable electrodes to complete multiple pulse impacts. In the present invention, the microwave radiation provides a seepage channel for the conductive ion solution to infiltrate into the coal seam, and the conductive ion solution dissolves small organic molecules in the coal to produce the effect of hole expansion and seam creation. The coal between the drill holes undergoes multiple discharge breakdowns, causing a large number of cracks in the coal between the drill holes, forming a controllable crack zone, achieving the effect of overall pressure relief and weakening of the coal seam, greatly improving the porosity and permeability of the coal seam, and promoting gas desorption .

Description

technical field [0001] The invention relates to the technical field of coal mine gas prevention and control, in particular to a coal seam weakening anti-reflection device and method in which microwave-assisted pre-cracking and high-voltage pulse are coordinated. Background technique [0002] With the continuous increase of coal mining depth, the number of deep mines will increase exponentially. Deep mines generally have the characteristics of microporosity, low permeability, and high adsorption, which makes gas drainage difficult in most coal seams and serious gas disasters. [0003] At present, the measures to weaken and increase permeability of low-permeability coal seams mainly include loosening blasting, hydraulic cutting, and high-pressure water injection to weaken the fracture. Among them, techniques such as loosening blasting, hydraulic slotting, and hydraulic punching have problems such as small impact range, large and complex construction, and so on. Coal seam wat...

AI Technical Summary

Problems solved by technology

However, the existing high-voltage pulse technology has unstable effects, excessive energy loss, high pulse voltage, and high risk.

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