煤体瓦斯运移诱发电位信号的实验研究  

Experimental research on electric potential signals induced by gas flowing in coal

作　　者：李忠辉[1,2] 王恩元[1,2] 谢绍东[1,2] 许晓阳[1,2] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221008

出　　处：《煤炭学报》2010年第9期1481-1485,共5页Journal of China Coal Society

基　　金：国家自然科学基金青年科学基金资助项目(40904028);国家自然科学基金资助项目(40874070);教育部新世纪优秀人才支持计划(NCET-06-0477);国际科技合作项目(2008DFB70100);中国矿业大学青年教师"启航计划"项目;中国矿业大学青年科研基金资助项目(2007A002)

摘　　要：为了研究瓦斯在煤体中运移引起的电位信号,设计了煤体充放瓦斯电位信号实验系统,测试了不同压力下瓦斯在煤体运移产生的电位信号。实验结果表明,瓦斯在煤体中的流动会引起煤体电位变化,在煤样进气口处产生的电位信号强度高于煤样中部电位信号强度,而在放气口处未测到显著的电位变化,随着瓦斯压力的衰减,煤样的电位信号强度减小;瓦斯流动电位与充气压力之间不存在显著线性关系,充气过程电位强度高时,相应放气过程产生的电位强度较低,而充气过程产生的电位强度低时,对应放气过程产生的电位信号强度较高;煤体瓦斯流动电位信号的产生主要为瓦斯气体对煤体微结构的冲击破坏而产生自由电荷,以及气体在煤体孔隙内流动的流动电势及瓦斯与煤体气固两相摩擦起电等。In order to study the electric potential signal induced by gas flow in coal,designed the experiment system of gas inflation and deflation,and tested the electric potential signal generated during the gas flowing in coal under different gas pressure.Experiment results show that the gas flow can cause the changes of electric potential on coal samples;the intensity of electric potential at air intake is higher than that at the middle of the coal samples,moreover,there is no obvious change at the gas outlet,and the intensity of electric potential decreases along with the attenuation of gas pressure.There is no notably linear relationship between electric potential and gas pressure,if the electric potential is higher in inflation process,the corresponding potential will be lower in the deflation process,and that,if the electric potential is lower in the inflation process,and the corresponding potential will be higher in the deflation process.The mechanism of electric potential during gas flow is due to the impacting destroy of microstructure of coal,stream potential of gas electrification by friction between gas and coal,that can produce free charges.

关 键 词：煤体 瓦斯 运移 电位信号 

分 类 号：TD713.2[矿业工程—矿井通风与安全]