Electric pulse cracking permeability improvement and adsorption and desorption integrated device and method

Abstract

The invention discloses an electric pulse cracking permeability improvement and adsorption and desorption integrated device and a method, wherein the electric pulse cracking permeability improvement and adsorption and desorption integrated device and the method are suitable for increasing the gas extraction rate of a low-permeability and high-adsorption coal seam. The electric pulse cracking permeability improvement and adsorption and desorption integrated device comprises a high-voltage charge power supply, a high-voltage energy storage capacitor, a high-voltage discharge switch, a coal sample fixing device, a hydraulic control system, a vacuum pump device and an adsorption and desorption system; and firstly, the high-voltage energy storage capacitor is charged through the high-voltage charge power supply, the high-voltage discharge switch is turned on, a coal sample is discharged through a positive electrode and a negative electrode, huge energy is generated to act on the coal sampledirectly, a crack is formed in the coal sample, and then the adsorption and desorption volume of the coal sample which is broken down is measured through the adsorption and desorption system arrangedin the coal sample fixing device. The coal seam is cracked through a high-voltage pulse discharge technology, electric pulse cracking permeability improvement and adsorption and desorption measurement integrated operation can be achieved, and the method is accurate in measuring and convenient to operate and has important significance for researching the electric pulse cracking effect.

Description

technical field [0001] The invention relates to the technical field of coal mine gas drainage, in particular to an electric pulse fracturing anti-reflection and adsorption-desorption integrated experimental device and method suitable for studying problems such as difficulties in coal seam gas drainage. Background technique [0002] In recent years, as my country's coal mining has gradually entered the deep mining stage, problems such as difficulty in gas extraction are particularly prominent in the mining process of low-permeability coal seams, and the key to solving this problem is to improve the gas permeability of coal samples. There are two main methods to improve the effect of gas drainage, one is to promote the desorption of gas, and the other is to dredge the channel of gas seepage. At present, the commonly used gas extraction methods mainly include: hydraulic fracturing, deep hole blasting, hydraulic slitting, and protection layer mining. However, there are some defe...

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Problems solved by technology

At present, the commonly used gas extraction methods mainly include: hydraulic fracturing, deep hole blasting, hydraulic slitting, and protection layer mining. However, there are some defects in the application of these technologies. Lock phenomenon, blocking the channel of gas migration; deep hole blasting technology has problems such as difficulty in feeding chemicals; mining of protective layer is not suitable for mining of single coal seam; application effect of hydraulic slotting in soft coal seam is poor

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