基于突出热动力学的瓦斯膨胀能计算方法研究

Study on the calculating methods of gas expansion energy base on thermo kinetic of outburst

瓦斯膨胀能是煤与瓦斯突出的主要能量之一.采用实验室试验、数值模拟和理论分析相结合的方法研究了煤与瓦斯突出过程中煤体温度的变化规律,在此基础上提出了对突出做功的瓦斯膨胀能的计算方法.研究结果表明,煤与瓦斯突出不是大多数学者认为的绝热过程,而是一个偏向于等温过程的多变过程.多变指数可以通过实验测定的煤体温度来计算,吸附瓦斯和游离瓦斯的膨胀功可以利用多变指数计算.

Gas expansion energy is the main energy which causes coal and gas outburst, the temperature variation of coal in the course of coal and gas outbursts was studied through testing in lab, numerical simulation and theoretical analysis. Based on this, the calculating methods of gas expansion energy which worked to the outbursts were put forward. The results show that the process of coal and gas outbursts is not an adiabatic process, which is accepted by most researchers, but a polytropic process that is nearly an isotherm process. The polytropic index can be calculated by the experiment data of coal temperature, the free gas expansion work and adsorbed gas work can be calculated by using polytropic index.