Loaded coal rock constant pressure gas adsorption desorption testing system and method thereof

Abstract

The invention discloses a loaded coal rock constant pressure gas adsorption desorption testing system and a method thereof. The system comprises a gravity constant pressure device, a vacuum pump, a high pressure gas cylinder, a constant pressure gas tank, a sample tank, a gravity constant hydraulic device and a hand pump. The method can be used for carrying out following gas adsorption and desorption tests on a coal sample under different external loading pressures and different gas pressures: 1) studying the change of absorption characteristics caused by the damage of coal rocks under different loading effects, and studying the change rules of adsorption constant, adsorption quantity and the like with the load; 2) studying the gas desorption process of coal rocks containing gas under different loading situations; 3) studying the adsorption process and adsorption constant of coal rocks containing gas with different particle sizes under constant gas pressure; 4) studying gas desorptionprocess and rules of coal rocks containing gas with different particle sizes under different atmosphere pressures; and 5) studying the creep mechanical properties of the coal rocks containing gas in gas adsorption and desorption process.

Description

technical field [0001] The invention relates to a research technology for the adsorption and desorption law of loaded gas-containing coal rock mass during coal mining, in particular to a constant-pressure gas adsorption and desorption test system and method for loaded coal rock. Background technique [0002] Previous coal adsorption and desorption test systems only considered the adsorption and desorption rules of coal samples with different particle sizes under different temperatures and gas pressures, and studied the gas adsorption capacity and desorption difficulty of different particle coals. Due to the expansion of internal cracks and changes in the structure of coal under different loading conditions, the amount of gas adsorption and the difficulty of desorption both change. [0003] The current experimental device is difficult to complete the gas adsorption process, adsorption time, and desorption process of coal rock under the condition of constant load and constant ...

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Problems solved by technology

[0003] The current experimental device is difficult to complete the gas adsorption process, adsorption time and desorption process of coal rock under the condition of constant load and constant gas pressure, and the research results cannot quantitatively analyze and calculate the law of gas adsorption and desorption in coal rock mass during the mining process Neither can quantitative analysis and calculation of borehole gas emission attenuation law and gas drainage, let alone quantitative calculation of gas emission in the process of coal and gas outburst

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