1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400044, People’s Republic of China
2. College of Mechanical and Power Engineering, Chongqing University of Science & Technology, Chongqing 401331, People’s Republic of China
3. Nanxi Boiler Co. Ltd. Yibin 644104, Sichuan, People’s Republic of China