太阳能驱动有机朗肯循环热经济性优化  

THERMO-ECONOMIC OPTIMIZATION OF SOLAR-DRIVEN ORGANIC RANKINE CYCLE

作　　者：马丕胤 柴俊霖[1] 杨富斌[2] 张红光[2] Ma Piyin;Chai Junin;Yang Fubin;Zhang Hongguang(College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]内蒙古工业大学能源与动力工程学院,呼和浩特010051 [2]北京工业大学环境与生命学部,北京100124

出　　处：《太阳能学报》2024年第10期381-390,共10页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金青年项目(51906119);内蒙古工业大学博士科研启动基金(DC2100000957)。

摘　　要：根据槽式太阳能集热特性,选择R600和R245fa两种循环工质,以系统效率和单位能量产出成本为目标构建简单有机朗肯循环(BORC)和回热式有机朗肯循环(IHE-ORC)系统热经济性模型。利用非支配排序遗传算法进行双目标优化,采用熵权-TOPSIS法决策工质的两系统最佳热经济性,分析工质的两系统热经济性随运行参数蒸发压力、过热度和冷凝温度的变化。结果表明:在优化决策下,采用工质R245fa的IHE-ORC系统最佳效率和单位能量产出成本分别为54.11%、0.1548美元/kWh,热力性优势明显,采用工质R600的BORC系统最佳效率和单位能量产出成本分别为49.89%、0.1318美元/kWh,经济性表现较优;在运行参数变化范围内,IHE-ORC系统效率和单位能量产出成本均高于BORC系统,工质R245fa的系统效率显著较高,工质R600的系统单位能量产出成本相对较低。According to the heat collection characteristics of parabolic trough solar collector,R600 and R245fa are selected as circulating working fluids.The thermo-economic models of basic organic Rankine cycle(BORC)and the ORC system with internal heat exchanger(IHE-ORC)are established with the exergy efficiency and levelized energy cost(LEC)as objectives,respectively.Bi-objective optimization is conducted using the non-dominated sorting genetic algorithm.The optimal thermo-economic performance of two systems with two working fluids are obtained using TOPSIS with entropy weight method integrated.The variations of thermo-economic performance of the systems with evaporation pressure,superheat degree and condensation temperature are analyzed.The results show that,under optimization and decision making,when R245fa is used,IHE-ORC system has clear advantage in thermodynamic performance with the optimal exergy efficiency and LEC of 54.11%and 0.1548$/kWh,respectively.When R600 is used,BORC system exhibits better economic performance with the optimal exergy efficiency and LEC of 49.89%and 0.1318$/kWh,respectively.Within the variation range of operating parameters,the exergy efficiency and LEC of IHE-ORC system are always higher than those of BORC,and much higher exergy efficiency is obtained when using R245fa,while much lower LEC is achieved when using R600.

关 键 词：太阳能 朗肯循环 遗传算法 槽式太阳能集器 热力性 经济性 

分 类 号：TK123[动力工程及工程热物理—工程热物理]