college of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450011, China;
college of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450011, China;
Henan Institute of Metal urgy Corporation, Zhengzhou 450053, China;
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;