电力科技与环保2025，Vol.41Issue(4)：593-600,8.DOI:10.19944/j.eptep.1674-8069.2025.04.007
不同工质对有机朗肯循环热电联产系统热力性能影响的研究
Study on the effect of condensation temperature and working fluids on the thermal performance of Organic Rankine Cycle combined with heat and power system
摘要
Abstract
[Objective]This study aims to investigate the effects of condensation temperature and working fluids on the thermal performance of a biomass-fired Organic Rankine Cycle(ORC)combined heat and power(CHP)system,analyze the potential of different pure and zeotropic mixtures in improving system efficiency and reducing exergy destruction,and provide theoretical guidance for system optimization.[Methods]A thermodynamic model of a biomass-fired ORC-CHP system was established.Five pure working fluids(toluene,nonane,octane,dodecane,decane)and 3 non-zeotropic mixtures(toluene/nonane,toluene/octane,dodecane/decane)with different mass ratios were selected.System performance was calculated under condensation temperatures of 100℃and 75℃,focusing on power output,thermal load,ORC efficiency,fuel utilization factor,and exergy efficiency.The influence of backwater temperature was also evaluated.[Results]For pure fluids,the system achieved a power output above 665 kW and ORC efficiency of 22%at 100℃condensation temperature,with exergy efficiency reaching 25%.At 75℃,power output increased to 759 kW and ORC efficiency to 25%,but exergy efficiency dropped to 21%.Dodecane exhibited the best overall performance among pure fluids.For mixtures,toluene/nonane(0.7/0.3)and toluene/octane(0.7/0.3)achieved ORC efficiencies of 22.15%and 21.68%at 100℃,respectively,with lower exergy destruction in evaporators and condensers compared to pure fluids.Dodecane/decane(1/0)showed the highest exergy efficiency(25.01%and 21.98%).Additionally,backwater temperature 60,65,70℃had negligible impact on system performance.[Conclusion]A trade-off exists between power output and exergy efficiency with varying condensation temperatures—lower condensation temperature enhances power generation but reduces exergy efficiency.Zeotropic mixtures reduce exergy destruction in key components through temperature glide,outperforming pure fluids at optimal ratios.This study provides critical insights for working fluid selection and operational parameter optimization in biomass ORC-CHP systems.关键词
有机朗肯循环/热电联产系统/热力性能/冷凝温度/工质/㶲效率Key words
Organic Rankine Cycle/heat and power system/thermal performance/condensation temperature/working fluid/engineer quality/energy efficiency分类
能源科技引用本文复制引用
和婷,李瑞芳,黄峻伟,马彦花,郭智群..不同工质对有机朗肯循环热电联产系统热力性能影响的研究[J].电力科技与环保,2025,41(4):593-600,8.基金项目
云南省教育厅科学研究基金项目(2023J0398) （2023J0398）
