Effect of an electrostatic field on gas adsorption and diffusion in tectonic coal

作     者：Jian Kuo Lei Dongji Fu Xuehai Zhang Yugui Li Hengle 

作者机构：School of Resources and Earth Science China University of Mining & Technology School of Safety Science and Engineering Henan Polytechnic University 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2015年第25卷第4期

页      面：607-613页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 081903[工学-安全技术及工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：the National Natural Science Foundation of China(No.41272177) the Henan Polytechnic University Doctor Foundation(No.WS2013A11) 

主　　题：气体吸附 瓦斯扩散 构造煤 静电场 煤与瓦斯突出预测 焦耳热效应 扩散能力 解吸特性 

摘      要：The characteristics of adsorption, desorption, and diffusion of gas in tectonic coal are important for the prediction of coal and gas outbursts. Three types of coal samples, of which both metamorphic grade and degree of damage is different, were selected from Tongchun, Qilin, and Pingdingshan mines. Using a series of experiments in an electrostatic field, we analyzed the characteristics of gas adsorption and diffusion in tectonic coal. We found that gas adsorption in coal conforms to the Langmuir equation in an electrostatic field. Both the depth of the adsorption potential well and the coal molecular electronegativity increases under the action of an electrostatic field. A Joule heating effect was caused by changing the coal–gas system conductivity in an electrostatic field. The quantity of gas adsorbed and DP result from competition between the depth of the adsorption potential well, the coal molecular electronegativity, and the Joule heating effect. DP peaks when the three factors control behavior equally. Compared with anthracite, the impact of the electrostatic field on the gas diffusion capacity of middle and high rank coals is greater. Compared with the original coal, the gas adsorption quantity, DP, and the gas diffusion capacity of tectonic coal are greater in an electrostatic field. In addition, the smaller the particle size of tectonic coal, the larger the DP.