化工学报2013，Vol.64Issue(3)：820-826,7.DOI:10.3969/j.issn.0438-1157.2013.03.006
有机朗肯循环系统最佳蒸发温度和(火用)分析
Optimal evaporating temperature and exergy analysis for organic Rankine cycle
摘要
Abstract
Since energy issues become increasingly urgent in the world, considerable interest has focused on the utilization of low-grade waste heat. Organic Rankine cycle (ORC) is one of the effective routes to transform the low-grade waste heat to electricity. In this study, the maximum useful output work and exergy efficiency of the ORC are selected as the objective functions. 10 different working fluids are chosen to comprehensively investigate and analyze the important characteristics of the two objective functions in the subcritical state. The results show that an optimal evaporating temperature exists for each working fluid, at which the useful work is the maximum. Moreover, the higher the critical temperature, the higher the optimal evaporating temperature. It is found that for the same heat source, the exergy efficiency decreases with the increase of the pinch point temperature difference. For the same pinch point temperature difference, the exergy efficiency has a maximum value when the heat source inlet temperature is twice of the pinch point temperature difference lower than the critical temperature. Otherwise, the exergy efficiency keeps increasing with the heat source temperature. These results provide some valuable guidance to optimize the ORC system and screen working fluid.关键词
有机朗肯循环/最佳蒸发温度/(火用)分析/最大做功能力Key words
organic Rankine cycle/ optimal evaporating temperature/ exergy analysis/ maximum useful work分类
能源科技引用本文复制引用
张军辉,刘娟芳,陈清华..有机朗肯循环系统最佳蒸发温度和(火用)分析[J].化工学报,2013,64(3):820-826,7.基金项目
国家重点基础研究发展计划项目(2011CB710701). （2011CB710701）
