Henan Polytechnic University, Henan Polytechnic University, Zhengzhou University of Light Industry, Henan Polytechnic University, Henan Polytechnic University, Henan Polytechnic University, Huazhong University of Science and Technology - State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, affiliation not provided to SSRN and Henan Polytechnic University