低温太阳能热力发电有机朗肯循环工质的选择  

Selection of Working Fluids for Low-temperature Solar Thermal Power Generation Organic Rankine Cycles

作　　者：王辉涛[1] 王华[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,昆明650032

出　　处：《动力工程》2009年第3期287-291,共5页Power Engineering

基　　金：云南省自然科学重点基金资助项目(2007E0014Z)

摘　　要：为了筛选出适宜于低温太阳能热力发电有机朗肯循环的工质,根据PR状态方程计算和分析了采用11种低沸点有机流体工质的低温太阳能发电朗肯循环的热力性能.结果表明:随着工质临界温度的升高,有机透平进口处的最大蒸发压力基本呈下降趋势;在凝结温度与有机透平进口温度一定的情况下,临界温度越高的流体,其循环热效率越高;使用正已烷和正戊烷能获得较高的循环热效率,凝汽器中的凝结压力比较适中,是比较适合用作低温太阳能热力发电有机朗肯循环的工质.To select a suitable working fluid for low-temperature solar thermal power generation organic Rankine cycle, the PR equation of state was adopted to calcualte and analyze the thermal performances of organic Rankine cycles driven by low-temperature solar energy using 11 kinds of organic fluids with low boiling points. Results reveal that the maximum evaporation pressure at the inlet of the organic turbine tends to decrease with the increase of the critial temperature of the working fluid. On condition that the condensation temperature and the turbine inlet temperature remain constant, the thermal efficiency of the cycle will rise with the increase of the critical temperature of the working fluid. High thermal efficiency of the cycle can be obtained with appropriate condensation pressure in the condenser by use of n-hexane or normal pentane. So the above two fluids are likely to be the most promising fluids for low-temperature so- lar thermal power generation orgainc Rankine cycles.

关 键 词：低温太阳能热力发电 有机朗肯循环 工质 热效率 临界温度 

分 类 号：TK514[动力工程及工程热物理—热能工程]