煤体电破碎过程中的电压与电流波形特性  

Waveform characteristics of voltage and current in coal fracturing process based on electrical fragmentation

作　　者：张祥良[1] 林柏泉[1] 李彦君 朱传杰[1] ZHANG Xiangliang;LIN Baiquan;LI Yanjun;ZHU Chuanjie(Key Laboratory of Gas and Fire Control for Coal Mines,School of Safety Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室安全工程学院,江苏徐州221116

出　　处：《中国矿业大学学报》2020年第6期1077-1084,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51474211);国家重点研发计划项目(2018YFC0807903)。

摘　　要：为了研究煤样电破碎过程中的电压与电流波形变化特性,通过自主搭建的煤岩电破碎实验系统研究了煤样电破碎过程中典型的电压与电流波形,测试了煤样厚度对电破碎过程中电压与电流的影响规律,分析了峰值电流、电击穿延时、瞬时功率随煤样厚度的变化特征,探讨了放电过程中煤样的沉积能量随时间的变化关系以及能量转化率与煤样厚度的变化关系.结果表明:相同击穿电压条件下,峰值电流与煤样厚度呈反比,电击穿延时则随着煤样厚度的增加而增加,瞬时功率与煤样厚度无明显关系.煤样厚度对于沉积能量的影响较为显著,沉积能量在起始阶段增长迅速,然后逐渐变慢,最终趋于稳定.相同击穿电压条件下,存在最优煤样厚度能够使煤样中沉积能量转化效率达到最大值.The typical voltage and current waveforms in the process of electrical fragmentation were studied by the self-built coal electrical breaking experimental system for the investigation of the variation mechanism of voltage and current. By testing the influence of coal sample thickness on voltage and current in the process of electrical fragmentation, the relationship between peak current, breakdown delay, instantaneous power and coal sample thickness was investigated. The relationship between deposited energy and time and the relationship between energy conversion rate and the thickness of coal sample were discussed. The results indicate that under the same breakdown voltage, the peak current is inversely proportional to the thickness of coal sample, while the electrical breakdown delay increases with the increase of the thickness of coal sample, but the instantaneous power has no obvious relationship with the thickness of coal sample. The thickness of coal sample has a significant effect on deposited energy. The deposited energy increases rapidly in the initial stage, then slows down gradually, and finally tends to be stable. There is an optimal energy conversion efficiency under the same breakdown voltage.

关 键 词：电破碎 煤样厚度 电压波形 电流波形 电学参数 

分 类 号：TD823[矿业工程—煤矿开采]