换热器传热能力对有机朗肯循环性能的影响分析
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摘要
为了提高低温有机朗肯循环的技术经济性,基于热力学第一和第二定律,建立了系统数学模型,以R1233zd(E)作为循环工质,在蒸发器热负荷恒定和系统净输出功最大的两种约束工况下,分析了蒸发器和冷凝器的传热能力对有机朗肯循环系统的影响。结果表明:适当提高蒸发器和冷凝器的传热能力均能提升有机朗肯循环系统的热力性能;相对而言,蒸发器传热能力的影响更为显著,当蒸发器与冷凝器的传热能力增大2倍时,系统热效率分别升高了约168%和60%。此外,存在最佳的蒸发器和冷凝器传热能力使有机朗肯循环系统的比初始总投资最小。
To improve the technical economy of the organic Rankine cycle( ORC) system,a mathematic model for the subcritical ORC driven by low-temperature heat sources was built based on the first and second laws of thermodynamics. With R1233 zd( E) as the cycle fluid,the influences of the heat transfer capacity of the evaporator and condenser on the ORC system were analyzed separately under two constraint conditions,i. e.,constant heat duty of evaporator and maximum net power output of system. The results show that a suitable increase of the heat transfer capacities of the evaporator and condenser can improve the ORC system thermodynamic performance; however,the heat transfer capacity of the evaporator has a greater influence. When the heat transfer capacities of the evaporator and condenser doubled,the thermal efficiency increased by 168% and 60%,respectively. Furthermore,at the optimum heat transfer capacities,the minimum initial total investment cost of the ORC system was realized.
To improve the technical economy of the organic Rankine cycle( ORC) system,a mathematic model for the subcritical ORC driven by low-temperature heat sources was built based on the first and second laws of thermodynamics. With R1233 zd( E) as the cycle fluid,the influences of the heat transfer capacity of the evaporator and condenser on the ORC system were analyzed separately under two constraint conditions,i. e.,constant heat duty of evaporator and maximum net power output of system. The results show that a suitable increase of the heat transfer capacities of the evaporator and condenser can improve the ORC system thermodynamic performance; however,the heat transfer capacity of the evaporator has a greater influence. When the heat transfer capacities of the evaporator and condenser doubled,the thermal efficiency increased by 168% and 60%,respectively. Furthermore,at the optimum heat transfer capacities,the minimum initial total investment cost of the ORC system was realized.
引文
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[19]GMEZ ALEZ S L,BOMBARDA P,INVERNIZZI C M,et al.Evaluation of ORC modules performance adopting commercial plastic heat exchangers[J].Applied energy,2015,154:882-890.
[2]BAO Junjiang,ZHAO Li.A review of working fluid and expander selections for organic Rankine cycle[J].Renewable and sustainable energy reviews,2013,24:325-342.
[3]LECOMPTE S,HUISSEUNE H,VAN DEN BROEK M,et al.Review of organic Rankine cycle(ORC)architectures for waste heat recovery[J].Renewable and sustainable energy reviews,2015,47:448-461.
[4]ZYWICA G,KACZMARCZYK T Z,IHNATOWICZ E.A review of expanders for power generation in small-scale organic Rankine cycle systems:Performance and operational aspects[J].Proceedings of the institution of mechanical engineers,part A:journal of power and energy,2016,230(7):669-684,doi:10.1177/0957650916661465.
[5]QUOILIN S,VAN DEN BROEK M,DECLAYE S,et al.Techno-economic survey of Organic Rankine Cycle(ORC)systems[J].Renewable and sustainable energy reviews,2013,22:168-186.
[6]PAPADOPOULOS A I,STIJEPOVIC M,LINKE P.On the systematic design and selection of optimal working fluids for Organic Rankine Cycles[J].Applied thermal engineering,2010,30(6/7):760-769.
[7]贺超,刘朝,焦有宙,等.超临界ORC系统综合性能优化[J].工程热物理学报,2015,36(10):2111-2116.HE Chao,LIU Chao,JIAO Youzhou,et al.Comprehensive performance optimization of supercritical organic Rankine cycle(ORC)system[J].Journal of engineering thermophysics,2015,36(10):2111-2116.
[8]RAMESHKUMAR A,UDAYAKUMAR M,SARAVANAN R.Heat transfer studies on a GAXAC(generator-absorberexchange absorption compression)cooler[J].Applied energy,2009,86(10):2056-2064.
[9]GUO Tao,WANG Huaixin,ZHANG Shengjun.Comparative analysis of CO2-based transcritical Rankine cycle and HFC245fa-based subcritical organic Rankine cycle using low-temperature geothermal source[J].Science China technological sciences,2010,53(6):1638-1646.
[10]HE Chao,LIU Chao,GAO Hong,et al.The optimal evaporation temperature and working fluids for subcritical organic Rankine cycle[J].Energy,2012,38(1):136-143.
[11]WU Yuandan,ZHU Yadong,YU Lijun.Thermal and economic performance analysis of zeotropic mixtures for Organic Rankine Cycles[J].Applied thermal engineering,2016,96:57-63.
[12]王娟丽,何雅玲,程泽东,等.基于模拟退火算法的有机朗肯循环的性能优化[J].工程热物理学报,2013,34(9):1606-1610.WANG Juanli,HE Yaling,CHENG Zedong,et al.Performance optimization of organic Rankine cycle based on simulated annealing algorithm[J].Journal of engineering thermophysics,2013,34(9):1606-1610.
[13]WU Dan,AYE L,NGO T,et al.Optimisation and financial analysis of an organic Rankine cycle cooling system driven by facade integrated solar collectors[J].Applied energy,2017,185:172-182.
[14]刘超,徐进良,陈奇成,等.低温跨临界有机朗肯循环工质筛选[J].中国电机工程学报,2013,33(23):37-43.LIU Chao,XU Jinliang,CHEN Qicheng,et al.Working fluid selection for low temperature transcritical organic Rankine cycle[J].Proceedings of the CSEE,2013,33(23):37-43.
[15]倪渊,赵良举,刘朝,等.非共沸混合工质ORC对低焓地热能的深度利用[J].太阳能学报,2014,35(9):1670-1676.NI Yuan,ZHAO Liangju,LIU Chao,et al.Deeply recovery of low-enthalpy geothermal resources by organic Rankine cycles with non-azeotropic mixtures[J].Acta energiae solaris sinica,2014,35(9):1670-1676.
[16]孙志强,易思阳,郭美茹,等.利用中低温余热的回热有机朗肯循环性能分析[J].热能动力工程,2015,30(1):24-30.SUN Zhiqiang,YI Siyang,GUO Meiru,et al.Analysis of the performance of recuperative organic Rankine cycles utilizing a medium and low temperature waste heat[J].Journal of engineering for thermal energy and power,2015,30(1):24-30.
[17]ZHANG Shengjun,WANG Huaixin,GUO Tao.Performance comparison and parametric optimization of subcritical Organic Rankine Cycle(ORC)and transcritical power cycle system for low-temperature geothermal power generation[J].Applied energy,2011,88(8):2740-2754.
[18]GIMELLI A,LUONGO A,MUCCILLO M.Efficiency and cost optimization of a regenerative Organic Rankine Cycle power plant through the multi-objective approach[J].Applied thermal engineering,2017,114:601-610.
[19]GMEZ ALEZ S L,BOMBARDA P,INVERNIZZI C M,et al.Evaluation of ORC modules performance adopting commercial plastic heat exchangers[J].Applied energy,2015,154:882-890.