Test system and method for gas adsorption and desorption of soft coal under load

Abstract

The invention relates to a system and a method for a loaded structure soft coal gas adsorption desorption test. The system comprises a gas supply device, a loading device, a vacuum pumping device, a thermostat and a gas desorption instrument, wherein the gas supply device comprises a high-pressure gas tank, a pressure reducing valve and an inflating tank; the loading device comprises a pressure cylinder, a piston, a heat shrink pipe and a manual hydraulic pump; a gas inlet high-pressure pipe and a gas outlet high-pressure pipe are respectively connected with the left and right ends of the heat shrink pipe; the other end of the gas inlet high-pressure pipe is communicated with the inflating tank; the other end of the gas outlet high-pressure pipe is connected with a two-position three-way valve; a water draining pipe is connected with the bottom of the pressure cylinder; the vacuum pumping device comprises a vacuum pump and a vacuum meter; the vacuum pump is communicated with the two-position three-way valve through the high pressure pipe; and the gas desorption instrument is communicated with the two-position three-way valve through the high pressure pipe. The system provided by the invention fully considers the influences of stress and temperature and the gas adsorption desorption test is performed by changing the loading pressure endured by the soft coal sample under stationary temperature, so that the coal seam gas adsorption desorption rule under a loaded condition is acquired.

Description

technical field [0001] The invention belongs to the technical field of gas test devices, and in particular relates to a gas adsorption and desorption test system and method for soft coal with a loaded structure. Background technique [0002] Adsorption and desorption is one of the most basic migration modes of coalbed methane. It is of great significance to clarify the law of adsorption and desorption of coalbed methane for the prevention and control of coal mine gas disasters in my country. People often use unloaded granular coal when studying the adsorption and desorption laws of gas-containing coal, but it is well known that the occurrence environment of coal seams is a complex environment of stress-temperature coupling, so the influence of stress on the obtained coal seam gas is not considered. The law of adsorption and desorption is untrue and unreliable, so it is necessary to develop the law of adsorption and desorption of coal seam gas under loading conditions. Cont...

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Problems solved by technology

People often use unloaded granular coal when studying the adsorption and desorption laws of gas-containing coal. However, as we all know, the occurrence environment of coal seams is a complex environment of stress-temperature coupling, so the influence of stress on the obtained coal seam gas is not considered. The law of adsorption and desorption is untrue and unreliable, so it is necessary to carry out the law of adsorption and desorption of coal seam gas under loading conditions.

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