System and method for judging competitive field intensity of gas adsorption and desorption

Abstract

The invention relates to a system and a method for judging competitive field intensity of gas adsorption and desorption. The system comprises a methane tank, a valve, a pressure gauge, a pressure regulating valve, a reference cylinder, a vacuum pump, a clamp device, a high-voltage power source, a constant-temperature water bath box, a flow rate sensor, a gas collecting box, a computer and a gas water drain device, wherein the clamp device comprises a cylinder body, and a coal sample cylinder is arranged in the cylinder body; a left electrode plate and a right electrode plate are arranged at both ends of the coal sample cylinder, and are respectively connected with an anode and a cathode of the high-voltage power source; the methane tank is connected with a gas inlet of the clamp device; agas outlet of the clamp device is connected with a gas exhaust pipeline, and the tail end of the gas exhaust pipeline is connected with the gas collecting box; the gas water drain device comprises a first metering cylinder and a second metering cylinder; the first metering cylinder is connected with the gas outlet of the clamp device, and the first metering cylinder is connected with the second metering cylinder. The system and the method have the advantage that the gas adsorption and desorption are measured by externally adding different electric fields, so as to obtain the gas adsorption anddesorption rule, find the competitive field intensity of gas extraction rate, and provide powerful experiment support for the recovery of coal beds.

Description

technical field [0001] The invention belongs to the category of enhanced coal seam gas drainage rate by an external electric field, and in particular relates to a system and method for judging the dominant field strength of gas adsorption and desorption. Background technique [0002] Coal and gas outbursts are the biggest threat to mine safety, and gas is the chief culprit. Therefore, increasing the gas extraction rate is of great significance to prevent coal and gas accidents. [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. [0004] At present, there are three types of methods to improve gas desorption and seepage in coal seams. The first type belongs to mechanical methods such as hydraulic and blasting fracturing, drilling and slotting to relieve pressure, and mining liberated layers. The second type is through gas injection replac...

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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

[0004] At present, there are three types of methods to improve gas desorption and seepage in coal seams. The first type belongs to mechanical methods such as hydraulic and blasting fracturing, drilling and slotting to relieve pressure, and mining liberated layers. The second type is through gas injection replacement and water injection displacement. , and the third category is through methods such as external temperature field, microwave field and sound field. Judging from the practical application effects of these methods, due to the differences in coal seam occurrence conditions in various mines, some methods have not been popularized and applied in many mining areas. Explore other new technical methods and theories

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