1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
2. School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
3. State Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China
4. China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China
5. School of Mechanical and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, China