热虹吸三角循环发电系统?分析研究  

Exergy analysis for a power generation system using thermosyphon-based trilateral cycle

作　　者：储柱磊 李斌 王厉 CHU Zhulei;LI Bin;WANG Li(School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学建筑工程学院,浙江杭州310018

出　　处：《热力发电》2023年第4期90-98,共9页Thermal Power Generation

摘　　要：通过上升管两相流模型和热力学模型,对前期工作中提出的重力式三角循环系统(TTLC)进行了?分析研究,以探究系统各环节的?损情况及其影响因素。结果表明:随热源温度提高,系统?效率在15%~30%变化,提高热源温度有利于增加系统?效率;随冷源温度降低,系统?效率在23%~27%变化并存在最优冷源温度;加热器热端温差也存在优化可能,其值为4℃是一个比较合理的选择;上升管?损率是影响系统?效率的主要因素,尤其是在系统温差较大的情况下;减小加热器夹点温差有利于降低加热器?损率和排热?损率,但会增加其他?损,总体上减小夹点温差有利于增加系统?效率。By riser two-phase flow model and thermodynamic model, exergy analysis for the thermosyphon-based trilateral cycle(TTLC) proposed in the previous work by the authors is carried out to investigate the exergy performance of the system and the relevant influencing factors. The results show that, the system exergy efficiency varies in the range of 15%~30% with the increasing inlet temperature of heat source, which always helps to enhance the exergy efficiency. As the inlet temperature of cooling source decreases, the exergy efficiency changes from 23%to 27% with an optimum value. An optimization opportunity exists for the temperature difference of heater at the hot side, for example, a setting value of 4 ℃ seems to be a better choice. The riser exergy loss rate is a key factor to determine the system efficiency, especially under the condition where the temperature difference of the cycle is relatively larger. Decreasing temperature pinch point of the heater helps to decrease the internal and external exergy loss rates of the heater, but will lead to more exergy destructions in other processes. However, it exerts positive effects on system efficiency on the whole.

关 键 词：三角循环 热虹吸效应 两相流 ?分析 

分 类 号：TM61[电气工程—电力系统及自动化]