1. Institute of Energy, Hefei Comprehensive National Science Center (Anhui Energy Laboratory), Hefei 230031, Anhui, China
2. Key Laboratory of Coal Mine Gas and Fire Prevention, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
3. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
4. School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China