煤粒瓦斯解吸温度变化影响因素及与突出的关系研究  

Study on the influential factors of the temperature change in the process of gas desorption and their relation with the outbursts

作　　者：史广山[1,2] 魏风清[1,2] 高志扬[1,2] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000 [2]河南理工大学,河南省瓦斯地质与瓦斯治理重点实验室--省部共建国家重点实验室培育基地,河南焦作454000

出　　处：《安全与环境学报》2015年第5期78-81,共4页Journal of Safety and Environment

基　　金：973项目(2012CB723103);长江学者和创新团队发展计划项目(IRT1235);十二五重大专项(2011ZX05040-005)

摘　　要：基于扩散理论和热力学基本原理建立了瓦斯解吸过程温度变化公式,以及温度变化与瓦斯膨胀能、瓦斯解吸量的关系式,在此基础上研究了煤粒粒度、瓦斯压力、吸附常数a、扩散系数对解吸过程温度变化的影响及温度变化与煤与瓦斯突出的关系。结果表明:随煤粒粒度减小,瓦斯压力、瓦斯含量增大,扩散能力增强,瓦斯解吸引起的温度下降幅度增大。随解吸过程中温度降低,瓦斯解吸量、瓦斯膨胀能呈明显增大趋势,由此可见,解吸过程中温度下降幅度越大,煤层煤与瓦斯突出危险性越大。This present paper is inclined to study the influential factors and their relation with the outbursts of temperature change in the process of the gas desorption. For the study propose,first of all,we have worked out the formulas of the temperature change with the gas desorption going on,and also the relation between the temperature change and the desorption rate,along with the gas-expanding energy burstout based on the diffusion theory and the thermodynamics. And,then,with the help of the established formulas,we have analyzed the impact of the coal particle size,the gas pressure,the adsorption constant a,the diffusion coefficient of the coal particles on the temperature change in the process of the gas desorption. The results of our study indicate that： the diminution of the coal particle size tends to lead to quick decrease of the temperature in the gas desorption process. Since the particle size of the Tectonic coal tends to decrease with the destruction type increasing,it can be concluded that the change of temperature tends to produce more and more obvious influence if the destruction type turns to be dominant in the desorption process. The gas concentration increases with the enhancing of the gas pressure,And by the Fick＇s law we can know that the gas desorption volume will raise with the big gas concentration gradient,which is likely to cause the temperature degree to drop.Therefore,the bigger the adsorption constant a,the greater the gas concentration and the gas desorption volume,which can in turn make the temperature drop. The diffusion coefficient demonstrates the ability that the gases pass through the microporosity and the matrix of the coal. The bigger the diffusion coefficient is,the larger the gas desorption volume will be,and,so the larger diffusion coefficient can naturally lead to the temperature drop in the progress of desorption. What＇s more,with the decrease of the temperature,the desorption amount and the gas expansion energy will also increase fast. Thus,it can be concluded that the s

关 键 词：安全工程 解吸 温度 扩散 热力学 煤与瓦斯突出 

分 类 号：X936[环境科学与工程—安全科学]