Insights of physicochemical structure changes of bituminous coal with acidification-assisted controlled electric pulse through SEM, XRD and FTIR

被引:0
|
作者
Yan, Fazhi [1 ]
Gao, Changjiong [1 ]
Peng, Shoujian [2 ]
Yang, Xuelin [1 ]
Li, Ziwen [1 ]
Yang, Mengmeng [1 ]
Zeng, Tao [1 ]
Yang, Yongdan [1 ]
机构
[1] Taiyuan Univ Technol, Coll Safety & Emergency Management Engn, Taiyuan 030024, Peoples R China
[2] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China
来源
GAS SCIENCE AND ENGINEERING | 2024年 / 132卷
基金
中国国家自然科学基金;
关键词
Coalbed methane; Controlled electric pulse; Breakdown voltage; SEM; FTIR; CONDUCTIVITY;
D O I
10.1016/j.jgsce.2024.205496
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Controlled electric pulse (CEP) cracking coal effectively enhances its permeability, but a high coal breakdown voltage (BV) can result in technical difficulties. To address this problem, the method of using HCl solution to improve the electrical conductivity of coal was proposed. The effects of HCl on coal BV were investigated, and the microstructural changes in coal were analyzed through scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. Compared with raw coal, the BV of acidified coal decreased significantly. The crushing degree of the coal samples was clearly enhanced with an increasing HCl concentration. Some internal coal minerals were acidified and dissolved, the aromatic layer spacing (d002) increased and the layer sheet stacking height (Lc) decreased, and the crystal structure was damaged. When acidified coal was broken down, numerous internal pores and cracks appeared, active coal groups were shed, the aliphatic hydrocarbons and oxygen-containing functional group contents increased, surface activity was reduced, and the hydroxyl content was reduced, which was conducive to rapid gas desorption. Acidification effectively reduces the BV of coal and improves the cracking and permeability enhancement effect of coal by CEP action.
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页数:12
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