1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China
2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
3. Shanxi Lanhua Sci-tech Venture Co., Ltd., Jincheng 048000, China