1. Ph.D. Student, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an 710049, P.R. China.
2. Associate Professor, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an 710049, P.R. China (corresponding author).
3. Dongfang Electric Corporation Limited, Chengdu 610036, P.R. China.
4. Dongfang Boiler Group Corporation Limited, Zigong 643000, P.R. China.
5. Professor, School of Energy and Power Engineering, Xi’an Jiaotong Univ., Xi’an 710049, P.R. China.
6. Professor, Dept. of Earth and Environmental Engineering, Columbia Univ., New York, NY 10027.