烟气驱动复叠式非共沸工质有机朗肯循环系统㶲分析  

Exergy analysis of cascade zeotropic working fluids organic Rankine cycle system driven by flue gas

作　　者：鄢银连 张军 段远源[2] 李健[2] 葛众 袁志鹏 相华江 黄桂冬 YAN Yinlian;ZHANG Jun;DUAN Yuanyuan;LI Jian;GE Zhong;YUAN Zhipeng;XIANG Huajiang;HUANG Guidong(School of Architecture and Urban Planning,Yunnan University,Kunming 650091,China;Department of Energy And Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]云南大学建筑与规划学院,云南昆明650091 [2]清华大学能源与动力工程系,北京100084

出　　处：《热科学与技术》2021年第3期263-270,共8页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51736005);云南省教育厅科学研究基金资助项目(2019J0025)。

摘　　要：通过构建复叠式非共沸工质有机朗肯循环系统模型,并采用㶲分析方法,研究了系统㶲效率随工质摩尔组分的变化规律以及不同摩尔组分下,系统各部件㶲损失分布情况。研究结果表明:受蒸发器泡点温度与高温级蒸发器夹点位置影响,当高温级循环工质环戊烷摩尔分数为0.8,低温级循环工质异丁烷摩尔分数为0.1时,系统㶲效率取得最大值48.56%,比采用纯工质时相对提高了3.83%;且采用非共沸工质后,排烟损失、高温级蒸发器㶲损失、低温级冷凝器㶲损失均有显著降低。The model of cascade zeotropic working fluids organic Rankine cycle(ORC) is constructed. The exergy analysis method is used to study the variations of exergy efficiency with the molar composition of working fluids and the distribution of exergy loss in different components of the system. The results show that the maximum exergy efficiency of the system is 48.56% when the concentration of cyclopentane in the high temperature side and isobutane in the low temperature side is 0.8 and 0.1 respectively, which is affected by the evaporation bubble point temperature and evaporator pinch point position of high-temperature cycle. And the exergy efficiency of the system relatively increases by 3.83% when the zeotropic working fluid is used, because the exergy loss of exhaust smoke, high-temperature evaporator and low-temperature condenser decrease significantly.

关 键 词：有机朗肯循环 复叠式循环 非共沸工质 㶲分析 

分 类 号：TK61[动力工程及工程热物理—生物能]