考虑组分迁移影响的混合工质ORC系统的最优充灌  

Optimal Charge Mass and Concentration in Organic Rankine Cycle System Using Mixtures Considering Composition Shift Effect

作　　者：张新铭[1] 郑友权 张建亮 

机构地区：[1]低品位能源利用技术及系统教育部重点实验室(重庆大学),重庆市沙坪坝区400044 [2]历下区国有资产运营有限公司,山东省济南市250014

出　　处：《中国电机工程学报》2017年第23期6926-6933,共8页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973计划)(2011CB710701)~~

摘　　要：非共沸混合工质ORC发电系统存在组分迁移现象,即工质循环浓度偏离充灌浓度。针对非共沸混合工质ORC系统最优充灌问题,以采用R600a/R601为工质的ORC系统为研究对象,通过循环优化得到最优循环浓度及循环各节点状态参数,导入基于Smith两相流模型及热力学平衡假设建立的两相区状态参数计算模型,结合传热计算,得到最优充灌质量与浓度。分析冷凝段冷却水设计温升及储液罐内设计积存工质质量对最优充灌质量和系统浓度偏移量的影响,结果表明:1)随着冷却水设计温升增大,最优充灌质量与浓度偏移量增大;2)随着储液罐内设计工质质量增大,最优充灌质量增大,浓度偏移量减小。该研究为设计条件下非共沸混合工质ORC系统的最优充灌提供了理论指导。In the ORC power system using zeotropic mixtures, there exists a phenomenon called composition shift that means that the circulating concentration is different from the charge concentration. In order to study the optimal charge mass and concentration of the working fluid, the ORC system using R600a/R601 was taken as the research object. The optimal circulating concentration and state parameters of each node were obtained by optimizing in the cycle and the optimal working fluid charge mass and concentration were calculated based on Smith two-phase flow model, the hypothesis of thermodynamic equilibrium and heat transfer calculation, The influence of the design temperature rise of cooling water in condensing section and the design working fluid mass in the storage tank on the optimal charge mass and the concentration shift in system was analyzed. The results are as follows： 1） Both the optimal working fluid charge mass and the concentration shift increase with the design temperature rise of cooling water; 2） The optimal working fluid charge mass increases while the concentration shift decreases with the design working fluid mass in the storage tank. A theoretical guidance on the optimal working fluid charge mass and concentration in the ORC system using zeotropic mixtures has been provided at the design condition in this paper.

关 键 词：有机朗肯循环 非共沸混合物 组分迁移 循环浓度 当地浓度 最优充灌质量与浓度 

分 类 号：TK123[动力工程及工程热物理—工程热物理]