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Effect of high-voltage thermal breakdown on pore characteristics of coal

机译:高压热击穿对煤孔特性的影响

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摘要

High-voltage thermal breakdown has great potential application in permeability enhancement of coal seam. The characteristics of the breakdown channel, coal element, porosity and microscopic coal petrography of coal under high-voltage electric load were experimentally studied. The coal interior left apparent tracks due to electric current burning with high temperature. The percentage of C, O, Al, Fe, and Si had slightly decreased, while the content of element N increased obviously. Low-pressure nitrogen gas adsorption (LP-N2GA) and mercury intrusion analysis showed that coal porosity increased. The increases of micropores and mesopores are beneficial to promotion of the ability of gas storage, and the increase of macropores could enhance the gas seepage and migration. The results of scanning electron microscope (SEM) show that there are many exogenous fractures in coal, which is also beneficial to gas seepage and migration. The results lay a theoretical foundation for application of high-voltage thermal breakdown in coal mines.
机译:高压热击穿在提高煤层渗透率方面具有广阔的应用前景。实验研究了高压电负载下煤的破坏通道,煤元素,孔隙率和微观煤岩学特征。由于电流在高温下燃烧,煤内部留下明显的痕迹。 C,O,Al,Fe和Si的含量略有下降,而N的含量明显增加。低压氮气吸附(LP-N2GA)和压汞分析表明,煤的孔隙度增加。微孔和中孔的增加有利于提高储气能力,大孔的增加可以促进气体的渗漏和运移。扫描电镜(SEM)的结果表明,煤中存在许多外生裂缝,这也有利于瓦斯的渗漏和运移。研究结果为高压热击穿在煤矿中的应用奠定了理论基础。

著录项

  • 来源
    《矿业科学技术学报:英文版》 |2017年第006期|P.1051-1055|共5页
  • 作者单位

    [1]State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;

    [2]School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;

    [2]School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;

    [2]School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;

    [2]School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;

    [2]School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;

    [2]School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;

  • 收录信息 中国科学引文数据库(CSCD);
  • 原文格式 PDF
  • 正文语种 CHI
  • 中图分类 矿业工程;
  • 关键词

    High-voltage thermal breakdown; Permeability enhancement; Porosity; Fracture; Gas adsorption;

    机译:高压热击穿;渗透性增强;孔隙率;断裂;气体吸附;
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