Coal particle gas diffusion attenuation characteristic measurement device and method

Abstract

The invention discloses a coal particle gas diffusion attenuation characteristic measurement method and a device thereof, which are suitable for coal gas content measurement. A control variable device, a constant temperature experiment device and a data collection device are included. Prepared and well-weighed coal particles are placed in a disc-shaped coal sample tank of the constant temperatureexperiment device; vacuum pumping is carried out under a constant temperature condition, the air tightness of the device is checked, a certain amount of gas is supplied to the coal sample tank and adsorption equilibrium is carried out; through the data collected by a pressure sensor of the data collection device, the volume of the gas in the coal sample tank diffused to a gas collection tank is obtained, a dead space gas volume in the coal sample tank is subtracted, the variation law of a gas diffusion amount in coal particles along with time is obtained, and the evolution law of a gas diffusion rate and a diffusion coefficient during a full coal particle exposure process along with the time is further obtained. A basis is provided for coal bed gas content determination, the outburst prediction accuracy is further improved, and a fast and economical calculation tool is also provided for sustainable development and the like of coal bed gas resources.

Description

technical field [0001] The invention relates to a measuring device and method, in particular to a measuring device and method for coal particle gas diffusion attenuation characteristics used in measuring coal seam gas content. Background technique [0002] my country is a large coal country, and the utilization ratio of coal fossil fuels is much higher than the world level. At the same time, my country is also a country with frequent accidents in coal mines. Gas accidents are the main form of coal mine disasters in my country at present, and it is also one of the major accidents that other countries have not been able to effectively contain. Since the founding of the People's Republic of China, there have been 25 major accidents in my country's coal mining industry that killed more than 100 people, including 23 gas accidents, accounting for 92% of the total number of accidents. It can be seen that gas accidents are a great threat to the safety of human life and property. ...

AI Technical Summary

Problems solved by technology

Because the gas pressure of coal samples containing high-pressure gas changes rapidly and spans a large area at the initial stage of exposure, neither the volumetric method nor the gravimetric method can measure the diffusion process of the coal body at the initial stage of exposure, and can only measure the pressure relief of the coal body in the coal sample tank. There are certain technical gaps in the diffusion process after reaching atmospheric pressure

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