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<p>To further enhance the recovery rate of low-temperature waste heat, the low-temperature flue gas in the sinter annular cooler was chosen as the heat source of an organic Rankine cycle (ORC) system, and the comprehensive evaluation of energy, exergy and economic performance of the ORC system was conducted deeply. The energy, exergy and economic performance models of the ORC system were established, and proper candidate organic working fluids (OWFs) were selected based on the thermo-physical properties of OWF and operating characteristics of ORC system. Then, the effects of ORC crucial parameters on the system energy, exergy and economic performances were evaluated in detail. Finally, the bi-objective optimization based on the genetic algorithm was conducted to analyze the optimal performance of the ORC system under the designed ORC crucial parameters, and the exergy efficiency and electricity production cost were set as the evaluation indexes of parametric optimization. The results indicate that the ORC system with the higher evaporation temperature and lower condensation temperature can obtain the larger system exergy efficiency and smaller electricity production cost. The smaller the superheat degree of OWF and pinch-point temperature difference in the evaporator are, the better the energy and exergy performances of the ORC system are. Under the optimization results, R245fa has the best comprehensive performance with the exergy efficiency of 46.34% and electricity production cost of 0.12123&#xa0;$/kWh among the selected candidate OWFs, which should be preferentially chosen as the OWF of the ORC system.</p>

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Energy, exergy, economic performance evaluation and parametric optimization of organic Rankine cycle for low-temperature flue gas waste heat recovery

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Jun-sheng Feng,
  • Hao Wu,
  • Xin-ni Cheng,
  • Liang Zhao,
  • Hui Dong

摘要

To further enhance the recovery rate of low-temperature waste heat, the low-temperature flue gas in the sinter annular cooler was chosen as the heat source of an organic Rankine cycle (ORC) system, and the comprehensive evaluation of energy, exergy and economic performance of the ORC system was conducted deeply. The energy, exergy and economic performance models of the ORC system were established, and proper candidate organic working fluids (OWFs) were selected based on the thermo-physical properties of OWF and operating characteristics of ORC system. Then, the effects of ORC crucial parameters on the system energy, exergy and economic performances were evaluated in detail. Finally, the bi-objective optimization based on the genetic algorithm was conducted to analyze the optimal performance of the ORC system under the designed ORC crucial parameters, and the exergy efficiency and electricity production cost were set as the evaluation indexes of parametric optimization. The results indicate that the ORC system with the higher evaporation temperature and lower condensation temperature can obtain the larger system exergy efficiency and smaller electricity production cost. The smaller the superheat degree of OWF and pinch-point temperature difference in the evaporator are, the better the energy and exergy performances of the ORC system are. Under the optimization results, R245fa has the best comprehensive performance with the exergy efficiency of 46.34% and electricity production cost of 0.12123 $/kWh among the selected candidate OWFs, which should be preferentially chosen as the OWF of the ORC system.