地热有机朗肯循环系统混合工质优化  

Optimal of Mixtures Working Fluids for Geothermal Organic Rankine Cycle System

作　　者：刘广林[1] 徐进良[1] 苗政[1] 

机构地区：[1]华北电力大学低品位能源多相流与传热北京市重点实验室,北京102206

出　　处：《工程热物理学报》2015年第12期2716-2720,共5页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划"973"计划(No.2011CB710703);国家自然科学基金(No.51306048);北京市自然科学基金(No.3122029)

摘　　要：针对低温饱和有机朗肯循环发电系统,以R134a、R245fa和R423a为有机工质,采用EES软件模拟分析有机朗肯循环发电系统膨胀机入口温度对系统输出功及其他参数的影响,确定低温有机朗肯循环发电系统的最佳工质选择。结果表明:随着膨胀机入口温度的增加,有机朗肯循环发电系统或膨胀机输出功存在最大值,且采用非共沸混合物R423a时系统或膨胀机输出的功最大,比采用R245 fa为工质时系统输出功增加14.9%;发电系统有机工质质量流量随膨胀机入口温度的增加呈相反趋势变化,回灌温度则与膨胀机入口温度变化趋势基本一致。In this work,a thermodynamic analysis on the low temperature saturated organic Rankine cycle power generation system was carried out based on the software EES.The effects of the expander inlet temperature on the system output power and other operation parameters were studied.The system performances when using R134a、R245fa and R423 as working fluid were compared in order to select the suitable working fluid.The results showed that the maximum value of the expander output power existed with the increase in the expander inlet temperature.The system power achieved maximum when using non-azeotropic mixtures R423 a as working fluids and it was about 14.9%higher than that using R245 fa.The mass flow rate of working fluids became smaller with the increase in the expander inlet temperature,while the recharge temperature of geothermal fluids showed a consistent trend with the increasing expander inlet temperature.

关 键 词：有机朗肯循环 非共沸混合物 地热发电 工质 

分 类 号：TK123[动力工程及工程热物理—工程热物理]