基于瓦斯涌出量的煤体瓦斯解吸特性研究

为了实时动态分析煤体的瓦斯解吸特性,基于瓦斯解吸速度幂关系式提出了一个表征煤体瓦斯解吸特性的新参数n,在现有矿井安全监测监控系统的基础上构建煤体瓦斯涌出监测系统,可实时计算n值,分析工作面前方煤体的解吸特性,并在卧龙湖煤矿进行了现场验证。结果表明,煤体瓦斯涌出监测系统可计算出掘进面每天的n值,n曲线与传统的瓦斯解吸指标K1、Δh2曲线的变化趋势正好相反,指标n能够表征煤体瓦斯的解吸特性。通过对比K1的突出危险临界值,可得到n的突出危险临界值,为煤与瓦斯突出的工作面预测提供依据。

Analysis on the gas desorption characteristics of coal based on the gas emission

To analyze the gas desorption characteristics of coal in real time, based on the power function representing gas desorption rate, a new parameter n representing coal gas desorption characteristics was proposed. The monitoring system of gas emission was constructed on the basis of the existing mine safety monitoring and control system, which could real-time calculate the n value, analyze the gas desorption characteristics at the front of the working face, and had a field test in Wolonghu coal mine. The results show that the monitoring system of gas emission could calculate the daily n value of heading face, the new parameter n shows the reversing trend to traditional desorption index K1 or ?h2, the parameter n could represent the coal gas desorption characteristics. By comparing the critical value of K1 corresponding to the the danger of outburst, the critical value of n could be obtained, which could provide the foundation for predicting the outburst hazard of working face.