1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan, People's Republic of China
2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu, People's Republic of China
3. Department of Energy and Power Engineering, Xuhai College, China University of Mining and Technology, Xuzhou, Jiangsu, People's Republic of China