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Breakage features of coal treated by cyclic single pulse electrical disintegration
Energy Science & Engineering ( IF 3.8 ) Pub Date : 2019-06-07 , DOI: 10.1002/ese3.360
Xiangliang Zhang 1, 2 , Baiquan Lin 1, 2 , Yanjun Li 1, 2 , Chuanjie Zhu 1, 2 , Yong Li 1, 2
Affiliation  

High‐voltage electrical pulse (HVEP) technology, a potential method for degassing coal seam in the future, has made great progress in field application. However, the previous studies mainly concentrated on the coal‐crushing effect of the action of single pulse, ignoring the influence of cyclic single pulse on the fracture structure of coal. In this paper, Huaibei anthracite coal and Inner Mongolia bituminous coal were taken as the experimental objects to study the effect of cyclic single pulse on the fracture structure of coal. The results show that the uneven distribution of electric field in the coal causes the crack to break along the interface between the mineral and the coal. Besides, the characteristics of cracks and functional groups of coal before and after electrical breakdown were investigated through scanning electron microscope and Fourier transform infrared spectroscopy. The results suggest that the relative contents of oxygen‐containing functional groups are reduced after electrical breakdown, which promotes the gas desorption from the surfaces of coal samples. Moreover, changes in CH4 adsorption capacity of HVEP‐treated coal were studied through a high‐pressure adsorption instrument, with the adsorption temperature set from 40 to 120°C. The results show that the adsorption amount of electrically broken coal is smaller than that of raw coal, which proves that temperature and current exert similar influences on the adsorption capacity of coal sample. Additionally, current waveforms indicate that the peak current increases with the number of cycle, whereas the breakdown time decreases with it. However, the peak current and breakdown time will eventually become stable as the number of cycles grows, demonstrating that electrical properties of coal are changed in the process of breakdown, which thus affects the next discharge.

中文翻译:

循环单脉冲电崩解法处理煤的破碎特性

高压电脉冲(HVEP)技术是未来将煤层除气的一种潜在方法,在现场应用中取得了很大的进步。但是,以前的研究主要集中在单脉冲作用的压煤作用上,而忽略了循环单脉冲对煤的破裂结构的影响。以淮北无烟煤和内蒙古烟煤为实验对象,研究循环单脉冲对煤的断裂结构的影响。结果表明,煤中电场的不均匀分布会导致裂纹沿矿物与煤之间的界面断裂。除了,通过扫描电子显微镜和傅里叶变换红外光谱研究了电击穿前后煤的裂纹和官能团的特征。结果表明,电击穿后含氧官能团的相对含量降低,这促进了气体从煤样品表面脱附。而且,CH的变化通过高压吸附仪器研究了HVEP处理过的煤的4种吸附容量,吸附温度设定为40至120°C。结果表明,电破碎煤的吸附量小于原煤,表明温度和电流对煤样的吸附量具有相似的影响。另外,电流波形表明峰值电流随着循环次数的增加而增加,而击穿时间则随之减少。但是,随着循环次数的增加,峰值电流和击穿时间最终将变得稳定,这表明煤的电特性在击穿过程中发生了变化,从而影响了下一次放电。
更新日期:2019-06-07
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