External electric filed reinforced coal sample gas desorption test method

Abstract

The invention belongs to category of a technology of increasing the gas extraction rate by a non-mechanical method and modifying coal power, and discloses an external electric filed reinforced coal sample gas desorption test method. In the process of performing coal sample gas emission initial velocity measuring test and a coal sample gas desorption test, an external electric field is applied to the coal sample. The physical properties of the coal body and the pore fractures of the coal body are changed, the adsorption potential is reduced, gas permeation and flowing of the coal body are reinforced, and the gas extraction rate is increased. Experimental results indicate that characteristics field intensity of 1200 v / cm exists, so that the gas desorption amount is maximal and the initial desorption amount of the gas can be increased by 20 to 40 percent.

Description

technical field [0001] The invention relates to the technical field of gas drainage, in particular to a test method for gas desorption of coal samples enhanced by an external electric field. Background technique [0002] The initial velocity of gas release is one of the indicators for predicting gas outburst. Gas outburst is completed instantaneously. The ability of coal to release gas is directly related to the occurrence of outburst. Studying the gas release rate in 0-1min is of great significance to the study of coal and gas outburst. . [0003] The average recovery rate of coal seam gas in my country is low, the desorption seepage is poor, and no extraction method that can significantly improve coal seam gas has been found. At present, there are three types of methods to improve coal seam gas desorption seepage. The first category belongs to hydraulic and blasting fracturing, drilling Mechanical methods such as slit pressure relief and mining of liberated layers, the sec...

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Problems solved by technology

[0003] The average recovery rate of coal seam gas in my country is low, the desorption seepage is poor, and no extraction method that can significantly improve coal seam gas has been found. At present, there are three types of methods to improve coal seam gas desorption seepage. The first category belongs to hydraulic and blasting fracturing, drilling Mechanical methods such as slit pressure relief and mining of liberated layers, the second type is through gas injection displacement and water injection displacement, and the third type is through methods such as external temperature field, microwave field, and sound field. From the practical application of these methods In terms of effects, due to the differences in coal seam occurrence conditions in various mines, some methods have not been popularized and applied in many mining areas, and it is urgent to explore other new technical methods and theories

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