(1. College of Science,University of Shanghai for Science and Technology, Shanghai 200093, China;
2. School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093, China;
3. School of Mechanical Engineering, Shanghai Jiao Tong University,Shanghai 200240, China)
Abstract:Based on the process of the waste heat recovery from the CDQ and the utilization system, the energy flow diagram and the exergy flow diagram were drawn. The waste heat conversion efficiency of the CDQ system was studied by means of the thermal balance method and the exergy balance method. The results show that the thermal efficiencies of the dry quenching furnace and the waste heat boiler were 82.39% and 67.35%, respectively, and the corresponding energy efficiencies were 82.13% and 65.77%. The thermal efficiency and the system energy efficiency were 74.33% and 55.32%, respectively. Through the exergy analysis calculation, it was found that the two parts, the internal heat transfer process of dry quenching furnace and the waste heat boiler have serious exergy loss. According to the results of the exergy analysis, two main devices of the CDQ waste heat utilization system were optimized to improve the energy utilization efficiency of the dry quenching system.