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 waste heat

中文关键词: 有机朗肯循环  复叠式循环  非共沸工质  㶲分析

英文关键词: organic Rankine cycle  cascade cycle  zeotropic working fluids  exergy analysis

中文摘要:

      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(火用)分析方法,研究了系统(火用)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(火用)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浓度为0.8,低温级循环工质异丁烷浓度为0.1时,系统(火用)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(火用)损失、低温级冷凝器(火用)损失均有显著降低。

英文摘要:

      In this paper, 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 and isobutane 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. Exergy loss of exhaust smoke, high-temperature evaporator and low-temperature condenser decreased significantly.