1. School of Safety Engineering and Research Center for Coal Mine Gas Control, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
2. Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
3. Kailuan (Group) Limited Liability Corporation, Tangshan, Hebei 130200, China