Themodynamic process analysis of coal and gas outbursts

Abstract：In allusion to the problem that the adiabatic hypothesis in calculating methane expansion energy is not consistent with actual situation, based on the fieldwork and laboratory research of others, energy conversion process in coal and gas outbursts is studied in the point of thermodynamics.That the methane expansion process is a polytropic process is presented, the calculation method of polytropic exponent has been pointed out.The thermodynamic model of energy exchange in coal and gas outburst process is established.

Keyword：coal and gas outbursts; thermodynamic process; methane expansion energy;