1 School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China 2 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Effect of flue gas outlet temperature in evaporator on thermal economic performance of organic Rankine cycle system for sinter waste heat recovery
1 School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China 2 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
摘要 In order to improve the recovery and utilization rates of sinter waste heat effectively, the organic Rankine cycle (ORC) system with subcritical cycle was designed to recover the low-temperature sinter cooling flue gas waste heat in an annular cooler for power generation. The thermodynamic, economic and multi-objective optimization models of ORC system were established, and R600a was selected as the ORC working medium. Subsequently, the variations in system thermodynamic performance and economic performance with the ORC thermal parameters were discussed in detail, and the optimal ORC thermal parameters were determined. The results show that the system net output power increases with increasing the evaporation temperature and decreasing the condensation temperature and increases first and then, decreases with the increase in superheat degree for a given flue gas outlet temperature in the evaporator, while the heat transfer area per unit net output power appears different variation trends in various ranges of flue gas outlet temperature. Taking the sinter cooling flue gas waste heat of 160 C as the ORC heat source, the optimal thermal parameters of ORC system were the flue gas outlet temperature of 90 C, the evaporation temperature of 95 C, the superheat degree of 10 C, and the condensation temperature of 28 C.
Abstract：In order to improve the recovery and utilization rates of sinter waste heat effectively, the organic Rankine cycle (ORC) system with subcritical cycle was designed to recover the low-temperature sinter cooling flue gas waste heat in an annular cooler for power generation. The thermodynamic, economic and multi-objective optimization models of ORC system were established, and R600a was selected as the ORC working medium. Subsequently, the variations in system thermodynamic performance and economic performance with the ORC thermal parameters were discussed in detail, and the optimal ORC thermal parameters were determined. The results show that the system net output power increases with increasing the evaporation temperature and decreasing the condensation temperature and increases first and then, decreases with the increase in superheat degree for a given flue gas outlet temperature in the evaporator, while the heat transfer area per unit net output power appears different variation trends in various ranges of flue gas outlet temperature. Taking the sinter cooling flue gas waste heat of 160 C as the ORC heat source, the optimal thermal parameters of ORC system were the flue gas outlet temperature of 90 C, the evaporation temperature of 95 C, the superheat degree of 10 C, and the condensation temperature of 28 C.
Jun-sheng Feng,Xin-ni Cheng,Huan-huan Wang, et al. Effect of flue gas outlet temperature in evaporator on thermal economic performance of organic Rankine cycle system for sinter waste heat recovery[J]. Journal of Iron and Steel Research International, 2023, 30(12): 2378-2390.
2023, Vol. 30 
