混合工质泄漏对有机朗肯循环发电系统性能的影响  

Effect of Leakage in Evaporator on the System Performance of the Organic Rankine Cycle with Binary Non-Azeotropic Mixtures

作　　者：张新铭[1,2] 达红梅 ZHANG Xin-ming DA Hong-mei(Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China College of Power Engineering, Chongqing University, Chongqing 400044, China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]重庆大学动力工程学院,重庆400044

出　　处：《北京理工大学学报》2016年第9期899-904,共6页Transactions of Beijing Institute of Technology

基　　金：国家"九七三"项目(2011CB710701)

摘　　要：基于有机朗肯循环系统中各部件、管道等密封导致的实际系统运行过程中不可避免地存在着循环工质的泄漏问题，结合余亥姆霍兹自由能状态方程、混合法则和等温泄漏模型，研究了非共沸混合工质R245fa／R601a（初始质量配比为0．6／0．4）在ORC发电系统蒸发器中泄漏率为0～50％时对混合工质配比以及循环性能的影响．结果表明：非共沸混合工质泄漏会造成混合工质配比及工质热物性的变化，系统循环性能也会改变，且蒸发出口段发生液相泄漏时对循环性能影响最大．随着泄漏率的增大，比净输出功减少率可达12．23％．The leak of working fluids is inevitably in the actual operation, since the sealing problems in organic Rankine cycle （ORC） such as in components, pipes, etc. Combined Helmholtz free energy model, mixing rule and isothermal leakage model, the variation of mass fraction ratio and cycle performance along with the leakage rate within 0 - 50% in different positions in the evaporator by using the R245fa/R601a as the working fluid of ORC system were analyzed. The results show that when leakage occurred, the change of the mass fraction ratio of mixed working medium, the thermal properties as well as system performance will take place. With the leakage rate increasing, the specific net work even reduces 12.23%. In addition, the liquid leak in the outlet section of evaporation makes a greatest influence on the system performance.

关 键 词：有机朗肯循环 混合工质泄漏 工质配比变化 系统性能分析 

分 类 号：TK123[动力工程及工程热物理—工程热物理]