Acoustic emission generated during the gas sorption-desorption process in coal

作     者：Ma Yankun Wang Enyuan Xiao Dong Li Zhonghui Liu Jie Gan Lijia Ma Yankun;Wang Enyuan;Xiao Dong;Li Zhonghui;Liu Jie;Gan Lijia

作者机构：School of Safety Enneering China University of Mining & Technology Xuzhou 221008 China Mineral and Mining Resource Engineering Southern Illinois University Carbondale Carbondale 62901 USA 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2012年第22卷第3期

页      面：391-397页

核心收录：

学科分类：081702[工学-化学工艺] 081901[工学-采矿工程] 0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：provide by the National Natural Science Foundation of China (Nos. 40804070, 50904067 and51104156) the Research Fund of The State Key Laboratory of Coal Resources and Mine Safety in CUMT (No. SKLCRSM09X01) the International Scientific and Technological Cooperation Projects(No. 2008DFB70100) the Foundation for the Author of National Excellent Doctoral Dissertation of China (No. 201055) the Program for New Century Excellent Talents in University (No. NCET-10-0768) 

主　　题：Sorption desorptionGasAcoustic emissionCycleMemory effect 

摘      要：An experimental system for monitoring the acoustic signals generated in coal during gas sorption and/or desorption was designed and the acoustic signals were observed under different gas pressures. The experimental results show that signals generated by the coal during gas adsorption are attenuated over time. Also, the signals are not continuous but are impulsive. The intensity of the signals generated during gas desorption is far smaller than that observed during adsorption. The signal seen during desorption remains essentially stable. Cycles of sorption and desorption cause acoustic emission signals that exhibit a memory effect, which depends upon the maximum gas pressure the sample was exposed to in earlier cycles. Lower pressures in subsequent cycles, compared to the maximum adsorption pressure in previous cycles, cause both the energy and impulse frequency to be lower than previously. On the contrary, a gas adsorption pressure that exceeds the maximum pressure seen by the sample during earlier cycles causes both the energy and impulse frequency to be high.