超临界CO2发电和跨临界喷射制冷复合系统研究  

Research on a Hybrid System Consisting of Supercritical CO2 Cycle and Transcritical Ejector Refrigeration Cycle

作　　者：黄玉磊 祝银海[1] 姜培学[1] HUANG Yu-Lei;ZHU Yin-Hai;JIANG Pei-Xue(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]热科学与动力工程教育部重点实验室清华大学能源与动力工程系

出　　处：《工程热物理学报》2019年第11期2455-2460,共6页Journal of Engineering Thermophysics

基　　金：国家自然基金面上基金(No.51576104)

摘　　要：冷热电联产系统具有潜在的能源、环境和经济效益,受到人们广泛关注。本文提出了一个由超临界压力CO2布雷顿循环和热驱动跨临界喷射制冷循环组成的冷电联产系统,建立了系统的热力学能量和拥分析模型,获得了主要运行参数对系统性能的影响规律。当制冷剂为R1234ze时,系统最高热效率0.60,[火用]效率0.51。[火用]损最大的四个部件依次是回热器、喷射器、压缩机和透平,而喷射器、冷凝器和蒸发器[火用]效率较低。研究表明增大透平入口压力和减小透平出口压力均可增大系统冷电输出和提高热、[火用]效率;循环泵出口压力对冷量和耗功产生共同影响,系统存在最优循环泵出口压力。Combined cooling,heating and power systems have potential energy,environmental and economic benefits and have received widespread attention.In this paper,a combined cooling and power system consisting of supercritical CO2 Brayton cycle and thermally driven transcritical ejector refrigeration cycle is proposed.The thermodynamic energy and exergy analysis models of the system are established,and the effects of main operating parameters on system performance are obtained.When the refrigerant is R1234 ze,the system has the maximum thermal efficiency of 0.60 and the maximum exergy efficiency of 0.51.The major components that contribute in exergy destruction are internal heat exchanger,ejector,compressor and turbine.The ejector,evaporator and condenser in the system have low exergy efficiencies.The results show that increasing turbine inlet pressure and decreasing turbine outlet pressure can increase system power and cooling outputs and improve thermal and exergy efficiencies;circulating pump outlet pressure has an influence on cooling capacity and power consumption,and the system has optimal circulator pump outlet pressure.

关 键 词：冷电联产 超临界压力CO2布雷顿循环 跨临界喷射制冷 热力学分析 

分 类 号：TB61[一般工业技术—制冷工程]