A constant-pressure desorption simulation test method and device for gas-containing coal gas in an overpressure environment

Abstract

The invention belongs to the technical field of coal mine safety, and relates to a gas constant pressure desorption simulation test method and device for coal containing gas in an overpressure environment. The gas constant pressure desorption simulation test device for the coal containing the gas in the overpressure environment comprises a coal sample tank located in an ultra thermostat, the coal sample tank is connected with a degassing unit, a methane charging unit and a constant pressure desorption unit, coal samples are put in the coal sample tank, adsorption equilibrium is achieved through degassing and methane charging, constant-temperature and constant-pressure desorption is conducted under the action of the ultra thermostat and the constant pressure desorption unit, and data is collected according to the gas constant pressure desorption simulation test method for the coal containing the gas in the overpressure environment. According to the gas constant pressure desorption simulation test method and device for the coal containing the gas in the overpressure environment, overpressure desorption of underground gas can be accurately simulated, a gas desorption mechanism is well recognized in the coal bed coring process and the gas extraction process, research techniques and technical ways are provided for improving reliability of calculation of the leaked gas quantity in the coal core in the coring process through a geological exploration desorption method and prediction of a gas extraction capacity of pre-extraction gas drilling, and the dangerous degree prediction of mine gas and pertinence of gas control are improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and relates to a constant-pressure desorption simulation test method and device for gas-containing coal gas in an overpressure environment. Background technique [0002] my country is the country with the largest coal output in the world, and it is also one of the countries with the most serious coal mine gas problem in the world. In the prevention and control of gas disasters, the gas content of coal seams is the basis for calculating gas reserves and gas emission, and it is also one of the important parameters for predicting the risk of coal and gas outburst. The accuracy of gas content measurement not only restricts the prediction of mine gas hazard degree Reliability, and affect the effectiveness and economy of gas prevention and control measures based on the prediction of gas hazard level, and may even endanger mine safety production. [0003] Coal seam gas content measurement meth...

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Problems solved by technology

At present, there are few studies on the gas desorption characteristics and laws of coal under overpressure environment, which is an urgent research problem to be solved.

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