Change features of outburst parameters in the thermal simulation experiment of low metamorphic coal

In order to study the evolution and preparation process of the gas outburst of coal body, we put the low metamorphic coal in sealed reactor under the action of heating to metamorphose and generate gas, maybe develop into coal and gas mixture with outstanding potential. In this way, we carry out the coal and gas outburst simulation experiment on inoculation evolution appearance. Research results show that the total amount of gas produced at relatively high experimental temperatures(450℃) is more than the total amount of gas produced at relatively low experimental temperatures(200℃), the production of the former is almost 10 times than the latter, and the corresponding V_daf, f and ΔP change 5 to 7 times. It indicates that temperature could change the chemistry structure of coal and then produce gas, and gas changes the physical structure when gas is produced. Their comprehensive effect increases the risk of coal outburst danger. It can be inferred from the experiment that along with the temperature increasing, the degree of coal metamorphism deepening, coal is more likely to be broken, the danger of coal outburst increases too.