考虑蒸发器压降的有机朗肯循环性能分析
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摘要
选取以R245fa为工质的地热有机朗肯循环(ORC)为对象,研究了蒸发器压降对系统性能的影响。结果表明:在给定蒸发温度下,随着蒸发器压降的提高,系统热效率和效率下降,压损功率增大,蒸发器成本先快速降低后降幅变小,存在最佳压降区间,使得系统能同时获得较高的效率和较低的蒸发器成本;随着蒸发温度的升高,蒸发器压降下降,而蒸发器成本提高,存在最佳蒸发温度区间,使得系统能同时获得较高的效率与较低的蒸发器成本;当热源温度升高时,蒸发器压降提高,且增幅逐渐增大;蒸发器成本随着板片面积的减小而降低,且降幅逐渐增大。
Taking the ORC system with R245 fa as working fluid driven by geothermal heat source as an object of study,the effect of evaporator pressure drop on the system performance was investigated.Results show that at a given evaporation temperature,both the thermal efficiency and the exergy efficiency of the system decrease and the pressure loss power increases with the rise of evaporator pressure drop,while the evaporation cost first decreases rapidly and then tends to be stable,indicating that there exists an optimal range of pressure drop where higher efficiency and less evaporator cost can be obtained simultaneously.The evaporator pressure drop decreases and the evaporator cost increases with the rise of evaporation temperature,and there exists an optimum range of evaporation temperature,where both higher efficiency and less evaporator cost can be achieved.With the rise of geothermal water temperature,the pressure drop of evaporator increases with rising increase rate.The evaporator cost reduces with decreasing size,and the decrease rate rises gradually.
Taking the ORC system with R245 fa as working fluid driven by geothermal heat source as an object of study,the effect of evaporator pressure drop on the system performance was investigated.Results show that at a given evaporation temperature,both the thermal efficiency and the exergy efficiency of the system decrease and the pressure loss power increases with the rise of evaporator pressure drop,while the evaporation cost first decreases rapidly and then tends to be stable,indicating that there exists an optimal range of pressure drop where higher efficiency and less evaporator cost can be obtained simultaneously.The evaporator pressure drop decreases and the evaporator cost increases with the rise of evaporation temperature,and there exists an optimum range of evaporation temperature,where both higher efficiency and less evaporator cost can be achieved.With the rise of geothermal water temperature,the pressure drop of evaporator increases with rising increase rate.The evaporator cost reduces with decreasing size,and the decrease rate rises gradually.
引文
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[11] LIU Qiang,DUAN Yuanyuan,YANG Zhen.Performance analyses of geothermal organic Rankine cycles with selected hydrocarbon working fluids[J].Energy,2013,63:123-132.
[12] WANG Y Z,ZHAO J,WANG Y,et al.Multi-objective optimization and grey relational analysis on configurations of organic Rankine cycle[J].Applied Thermal Engineering,2017,114:1355-1363.
[13] KIM D K,LEE J S,KIM J,et al.Parametric study and performance evaluation of an organic Rankine cycle(ORC)system using low-grade heat at temperatures below 80°C[J].Applied Energy,2017,189:55-65.
[14] LIU Xinghua,ZHANG Yufeng,SHEN Jiang.System performance optimization of ORC-based geo-plant with R245fa under different geothermal water inlet temperatures[J].Geothermics,2017,66:134-142.
[15]郭贵奇,罗向龙,许俊俊,等.ORC换热设备结构与操作参数多目标同步优化[J].工程热物理学报,2017,38(8):1619-1623.GUO Guiqi,LUO Xianglong,XU Junjun,et al.Heat exchange equipment structure and operation parameter multi-objective optimization simultaneously of ORC[J].Journal of Engineering Thermophysics,2017,38(8):1619-1623.
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[17] HAN D H,LEE K J,KIM Y H.Experiments on the characteristics of evaporation of R410Ain brazed plate heat exchangers with different geometric configurations[J].Applied Thermal Engineering,2003,23(10):1209-1225.
[18] IMRAN M,USMAN M,PARK B S,et al.Multiobjective optimization of evaporator of organic Rankine cycle(ORC)for low temperature geothermal heat source[J].Applied Thermal Engineering,2015,80:1-9.
[19]王建永,王江峰,王红阳,等.有机朗肯循环地热发电系统工质选择[J].工程热物理学报,2017,38(1):11-17.WANGJianyong, WANGJiangfeng, WANG Hongyang,et al.Selection of working fluid for organic Rankine cycle used in geothermal power plant[J].Journal of Engineering Thermophysics,2017,38(1):11-17.
[20]吴双应,易甜甜,肖兰.基于多目标函数的亚临界有机朗肯循环的参数优化和性能分析[J].化工学报,2014,65(10):4078-4085.WU Shuangying,YI Tiantian,XIAO Lan.Parametric optimization and performance analysis of subcritical organic Rankine cycle based on multi-objective function[J]. CIESC Journal,2014, 65(10):4078-4085.
[21]陈奇成,徐进良,苗政.中温热源驱动有机朗肯循环工质研究[J].中国电机工程学报,2013,33(32):1-7.CHEN Qicheng,XU Jinliang,MIAO Zheng.Working fluid selection for medium temperature organic Rankine cycle[J].Proceedings of the CSEE,2013,33(32):1-7.
[2]王志军,熊源泉.两级循环蒸发ORC系统深度回收燃煤锅炉烟气余热的研究[J].动力工程学报,2017,37(1):66-72,84.WANG Zhijun,XIONG Yuanquan.Waste heat recovery from boiler flue gas with two-stage cyclic evaporation ORC system[J].Journal of Chinese Society of Power Engineering,2017,37(1):66-72,84.
[3] MOUNIER V,MENDOZA L C,SCHIFFMANN J.Thermo-economic optimization of an ORC driven heat pump based on small scale turbomachinery and comparison with absorption heat pumps[J].International Journal of Refrigeration,2017,81:96-110.
[4] LIU Hongda,ZHANG Hongguang,YANG Fubin,et al.Multi-objective optimization of fin-and-tube evaporator for a diesel engine-organic Rankine cycle(ORC)combined system using particle swarm optimization algorithm[J].Energy Conversion and Management,2017,151:147-157.
[5]曹泷,刘秀龙,张鸣,等.有机朗肯循环发电系统变工况运行的实验研究[J].化工进展,2018,37(1):88-95.CAO Shuang,LIU Xiulong,ZHANG Ming,et al.Experimental study of organic Rankine cycle power generation system under various operating conditions[J].Chemical Industry and Engineering Progress,2018,37(1):88-95.
[6] MARTNEZ-GOMEZJ,PEA-LAMASJ,MARTN M,et al.A multi-objective optimization approach for the selection of working fluids of geothermal facilities:economic,environmental and social aspects[J].Journal of Environmental Management,2017,203:962-972.
[7] AHMADI P,DINCER I,ROSEN M A.Thermoeconomic multi-objective optimization of a novel biomassbased integrated energy system[J].Energy,2014,68:958-970.
[8] XU Jinliang,LIU Chao.Effect of the critical temperature of organic fluids on supercritical pressure organic Rankine cycles[J].Energy,2013,63:109-122.
[9] NAZARI N,HEIDARNEJAD P,PORKHIAL S.Multi-objective optimization of a combined steam-organic Rankine cycle based on exergy and exergo-economic analysis for waste heat recovery application[J].Energy Conversion and Management,2016,127:366-379.
[10]刘超,徐进良.中低温地热发电有机朗肯循环工质筛选[J].可再生能源,2014,32(8):1188-1194.LIU Chao,XU Jinliang.Working fluid selection for organic Rankine cycle in mid-temperature and lowtemperature geothermal power plant[J].Renewable Energy Resources,2014,32(8):1188-1194.
[11] LIU Qiang,DUAN Yuanyuan,YANG Zhen.Performance analyses of geothermal organic Rankine cycles with selected hydrocarbon working fluids[J].Energy,2013,63:123-132.
[12] WANG Y Z,ZHAO J,WANG Y,et al.Multi-objective optimization and grey relational analysis on configurations of organic Rankine cycle[J].Applied Thermal Engineering,2017,114:1355-1363.
[13] KIM D K,LEE J S,KIM J,et al.Parametric study and performance evaluation of an organic Rankine cycle(ORC)system using low-grade heat at temperatures below 80°C[J].Applied Energy,2017,189:55-65.
[14] LIU Xinghua,ZHANG Yufeng,SHEN Jiang.System performance optimization of ORC-based geo-plant with R245fa under different geothermal water inlet temperatures[J].Geothermics,2017,66:134-142.
[15]郭贵奇,罗向龙,许俊俊,等.ORC换热设备结构与操作参数多目标同步优化[J].工程热物理学报,2017,38(8):1619-1623.GUO Guiqi,LUO Xianglong,XU Junjun,et al.Heat exchange equipment structure and operation parameter multi-objective optimization simultaneously of ORC[J].Journal of Engineering Thermophysics,2017,38(8):1619-1623.
[16] WALRAVEN D,LAENEN B,D'HAESELEER W.Comparison of shell-and-tube with plate heat exchangers for the use in low-temperature organic Rankine cycles[J].Energy Conversion and Management,2014,87:227-237.
[17] HAN D H,LEE K J,KIM Y H.Experiments on the characteristics of evaporation of R410Ain brazed plate heat exchangers with different geometric configurations[J].Applied Thermal Engineering,2003,23(10):1209-1225.
[18] IMRAN M,USMAN M,PARK B S,et al.Multiobjective optimization of evaporator of organic Rankine cycle(ORC)for low temperature geothermal heat source[J].Applied Thermal Engineering,2015,80:1-9.
[19]王建永,王江峰,王红阳,等.有机朗肯循环地热发电系统工质选择[J].工程热物理学报,2017,38(1):11-17.WANGJianyong, WANGJiangfeng, WANG Hongyang,et al.Selection of working fluid for organic Rankine cycle used in geothermal power plant[J].Journal of Engineering Thermophysics,2017,38(1):11-17.
[20]吴双应,易甜甜,肖兰.基于多目标函数的亚临界有机朗肯循环的参数优化和性能分析[J].化工学报,2014,65(10):4078-4085.WU Shuangying,YI Tiantian,XIAO Lan.Parametric optimization and performance analysis of subcritical organic Rankine cycle based on multi-objective function[J]. CIESC Journal,2014, 65(10):4078-4085.
[21]陈奇成,徐进良,苗政.中温热源驱动有机朗肯循环工质研究[J].中国电机工程学报,2013,33(32):1-7.CHEN Qicheng,XU Jinliang,MIAO Zheng.Working fluid selection for medium temperature organic Rankine cycle[J].Proceedings of the CSEE,2013,33(32):1-7.