Device and method for improving coal bed gas desorption efficiency with microwaves

Abstract

The invention relates to a device and a method for improving coal bed gas desorption efficiency with microwaves, and belongs to the technical field of coal mine safety production. The device and the method allow the generated microwaves to act on a coal body, have a triaxial loading function, simulate a stress state of the coal body and a gas absorption and desorption process, obtain a coal body desorption rule by the action of the microwaves, and provide reference data for effective drainage and comprehensive utilization of the coal bed gas. The device comprises a microwave excitation coal bed gas desorption seepage experimental device and a triaxial coal rock pressed absorption and desorption system, wherein the triaxial coal rock pressed absorption and desorption system consists of a first pressure regulating valve, a second pressure regulating valve, a third pressure regulating valve, a methane gas cylinder, a loading gas cylinder, a confining pressure gauge, an axial pressure gauge, a pore pressure gauge, a flowmeter and a temperature control meter. The method for improving the coal bed gas desorption efficiency with the microwaves comprises the following steps of performing an absorption experiment, and performing a microwave excitation desorption experiment.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and relates to a device and a method for improving the desorption efficiency of coal bed gas, in particular to a device and a method for improving the desorption efficiency of coal bed gas by using microwaves. Background technique [0002] With the gradual development of my country's coal mine resources mining to the deep, the gas content in the coal body gradually increases, the permeability of the coal body and the gas desorption capacity decrease, resulting in a sharp increase in the difficulty of gas drainage, and the coalbed methane accumulated in the coal seam seriously affects the safety of coal mine production. [0003] In order to conduct gas drainage reasonably, conventional methods such as drilling and hydraulic fracturing are mostly used at present. Increasing the number and density of coal seam boreholes can increase the amount of gas drainage to a certain extent;...

AI Technical Summary

Problems solved by technology

The above method destroys the coal body structure and increases the number or width of coal body fissures to achieve the purpose of increasing the coal body permeability. Not only the cost is high, but also the effect of increasing the permeability is difficult to achieve the expected purpose.

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