1. College
of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
2. Research
Center of Coal Resources Safe Mining and Clean Utilization, Liaoning Technical University, Fuxin 123000, P. R. China
3. Key
Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China
4. Guangzhou Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, P. R. China