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Effect of capacitance on physicochemical evolution characteristics of bituminous coal treated by high-voltage electric pulses
Powder Technology ( IF 5.2 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.powtec.2020.03.041
Fazhi Yan , Jiang Xu , Shoujian Peng , Quanle Zou , Quangui Li , Kun Long , Zhiguo Zhao

Abstract The pore and microcrystalline structure of coal are studied by combining field emission-scanning electron microscopy (FE-SEM), nuclear magnetic resonance (NMR), and Raman spectroscopy to better understand the physicochemical evolution of bituminous coal treated by high-voltage electric pulses (HVEP) under different capacitance conditions. Experimental results show that the capacitance has no significant impact on the breakdown voltage of the coal body during HVEP treatment. However, increasing the capacitance can effectively increase the porosity of coal cores. In particular, the influence of increasing the capacitance on the macropores is obviously more significant than that on the micropore; besides, increasing the capacitance improved connectivity between the mesopores and macropores. In addition, following HVEP treatment, the microcrystalline defect of coal became smaller and pore arrangement more orderly. Thus, the larger the capacitance is, the more is the energy injected into the coal and the more obvious the change of the coal microcrystalline structure.

中文翻译:

电容对高压电脉冲处理烟煤理化演化特性的影响

摘要 结合场发射扫描电子显微镜(FE-SEM)、核磁共振(NMR)和拉曼光谱研究煤的孔隙和微晶结构,以更好地了解高压电脉冲处理烟煤的物理化学演化。 (HVEP) 在不同的电容条件下。实验结果表明,电容对HVEP处理过程中煤体的击穿电压没有显着影响。但是,增加电容可以有效地增加煤芯的孔隙率。尤其是增大电容对大孔的影响明显大于对微孔的影响;此外,增加电容可以改善中孔和大孔之间的连通性。此外,经过HVEP处理后,煤的微晶缺陷变小,孔隙排列更有序。因此,电容越大,注入煤中的能量越多,煤微晶结构的变化越明显。
更新日期:2020-05-01
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