太阳能再热式有机朗肯循环发电系统性能研究  

Performance of Reheating Solar Organic Rankine Cycle System for Power Generation

作　　者：赵国昌[1] 王永[1] Scott Thompson 宋丽萍[3] 王振华[4] 孙琪[4] 

机构地区：[1]沈阳航空航天大学航空航天工程学部(院),沈阳110136 [2]密西西比州立大学机械工程系,密西西比州39762 [3]沈阳航空航天大学科学与技术协会,沈阳110136 [4]中航工业沈阳发动机设计研究所,沈阳110015

出　　处：《农业机械学报》2016年第2期215-221,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：航空科学基金项目(20131954004);辽宁省攀登学者研究基金项目(20132015)

摘　　要：建立了带抛物槽式集热器的太阳能再热式有机朗肯循环发电系统模型,研究了再热式有机朗肯循环系统热效率增加量与输出功增加量随蒸发温度的变化规律。结果表明:当再热压力比为0.25时,太阳能再热式有机朗肯循环系统能有效地提高系统总效率,输出功随蒸发温度增加近似呈线性增加。对分别以R11、R114、R134a和R245fa为工质的再热式有机朗肯循环系统热效率提高量进行比较,以R245fa为工质的再热式有机朗肯循环热效率提高最大,达4.3%。Solar low-temperature waste heat sources below 200℃ were analyzed from the perspective of thermodynamics and an organic Rankine cycle（ ORC） power generation system of solar reheat using trough collectors based on the basic solar power ORC generation system was designed. The thermal efficiency of working fluids and the influence of various parameters on the system were studied by establishing a thermodynamic calculation model with four chosen organic substances. The thermal efficiency and net output power of the reheat ORC system and the basic Rankine cycle at different evaporation temperatures,as well as the influence of operating environment on the system were studied by modeling analysis of parabolic trough collector and ORC system. When the reheating pressure ratio was0. 25,results showed that the reheating ORC system can efficiently improve the total efficiency of the system,and the output power increased linearly as evaporation temperature increased. The effect of different working fluids on the ORC system was compared,and the efficiency increase was the largest when using R245 fa,which was increased by 4. 3%. As the evaporation temperature increased,the overall system efficiency with R245 fa as working fluid firstly increased quickly but then increased slowly,and reached the largest value at evaporation temperature between 110℃ and 130℃. Wind speed had minimal influence on the system efficiency,causing changes of only around 1%,while light intensity had great influence on the system efficiency. As light intensity increased,the total efficiency of the system was increased by 5%.

关 键 词：有机工质 太阳能 有机朗肯循环 再热式 热效率 

分 类 号：TK5[动力工程及工程热物理—热能工程]