煤体吸附瓦斯过程表面电位特征实验研究  

Experimental research on surface potential induced by gas sorption process in coal

作　　者：刘永杰[1] 李忠辉[1] 宋大钊[1] 李学龙[1] 苏飞[1] 景林波[1] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤炭学报》2013年第11期1977-1981,共5页Journal of China Coal Society

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-10-0768);国家"十二五"科技支撑计划资助项目(2012BAK04B07-2);中央高校基本科研业务费专项资金资助项目(2012DXS02)

摘　　要：为了研究煤体吸附瓦斯过程表面电位特征规律,设计了煤体吸附瓦斯过程的表面电位实验系统,测试了不同压力下煤体吸附瓦斯的电位信号。实验结果表明,煤体在吸附瓦斯过程中能够产生表面电位信号,且随着吸附时间的增长表面电位信号逐渐增大。对于同一个煤样,不同瓦斯压力下吸附过程中煤体产生的表面电位信号对前一次吸附瓦斯压力下煤体产生的电位信号具有记忆效应,当吸附瓦斯压力超过前一次吸附瓦斯压力值时,煤体产生的表面电位信号较大。而当吸附瓦斯压力低于前一次吸附瓦斯压力值时,煤体产生的表面电位较小。煤体吸附瓦斯产生表面电位信号的主要原因是瓦斯气体在煤体孔隙内渗流时产生流动电势,以及瓦斯气体对煤体微裂纹、裂隙的破坏产生的自由电荷等。In order to study the surface electric potential signals during the coal adsorbing gas, designed the experiment system of the coal adsorbing gas and tested the electric potential signal generated during the coal adsorbing gas under different gas pressure. Experiment results show that surface potential signals can be generated in the process of adsor- bing gas, and they increases gradually along with the growth of adsorption time. For the same coal samples, different gas pressure from the coal surface potential signal to the first adsorption gas pressure of coal potential signal has a memory effect in the process of absorption. When the adsorption gas pressure is higher than the first adsorption gas pressure, the coal induces stronger surface potential signals. And when the adsorption gas pressure is lower than the first adsorption gas pressure, the coal induce weaker surface potential signals. The main reasons why surface potential signals can be generated from coal adsorbing gas are that the gas seepage in coal pores produces flow potential and free charge is generated when the gas damages micro cracks and crack of coal.

关 键 词：表面电位 吸附 瓦斯 记忆效应 特征规律 

分 类 号：TD712[矿业工程—矿井通风与安全]