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Journal of Mining Sciences

2019 year, number 2

The Power Source for Coal and Gas Outburst

Hong Lin1,2, Gao Dameng1,2, Wang Jiren1,2, Zheng Dan1,2
1Liaoning Technical University, Fuxin, China
2Key Laboratory of Mine Thermodynamic Disaster & Control of Ministry of Education, Huludao, China
Keywords: внезапный выброс угля и газа, эксперимент, адсорбция азота, уравнение Дубинина - Радушкевича, источник энергии, заполнение микропор, многослойная адсорбция, Coal and gas outburst, nitrogen adsorption experiment, Dubinin-Radushkevich equation, power source, micropore filling, adsorption of multilayer

Abstract

To find out the power source for coal and gas outburst, the experimental instrument ASAP2020M was used for nitrogen adsorption experiment. The experiment was carried out at the temperature of 77 K, in which the activity of nitrogen can be reduced at least and the results of the test were more accurate. The experimental data were fitted by the function of f(x)=axb. The total volume of micropores and the degree of micropore volume filled by nitrogen were calculated by the Dubinin-Radushkevich equation. In unexploited coal body, the gas desorption occurs in a unit, it could trigger a desorption of the neighboring units of coal body. When it reaches a certain level that can push the coal body forward, the coal and gas outburst would happen. For the material containing micropores and mesopores like coal, the inflection point was the demarcation point of micropore filling and adsorption of multilayer.