超临界二氧化碳混合工质储能系统热力学分析  

Thermodynamic analysis of supercritical carbon dioxide mixed working fluid energy storage system

作　　者：王迪[1] 崔颖晗 孙灵芳[1] 周云龙[2] WANG Di;CUI Yinghan;SUN Lingfang;ZHOU Yunlong(School of Automation Engineering,Northeast Electric Power University,Jilin 132000,Jilin,China;School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132000,Jilin,China)

机构地区：[1]东北电力大学自动化工程学院,吉林吉林132000 [2]东北电力大学能源与动力工程学院,吉林吉林132000

出　　处：《化工学报》2024年第10期3414-3423,共10页CIESC Journal

基　　金：国家自然科学基金项目(52306004)。

摘　　要：为了解决可再生能源的间歇性和不稳定性等问题,基于超临界压缩二氧化碳储能(supercritical compressed carbon dioxide energy storage,SC-CCES )系统,利用CO_(2)基二元混合物作为循环工质,对系统进行热力学性能分析。研究不同混合工质在不同比例下的储能性能以及储能系统往返效率和储能密度的变化规律。结果表明:超临界CO_(2)混合工质储能系统的往返效率随着混入氪气质量分数的增加而升高,且高于单一CO_(2)工质的往返效率;随着混入异丁烷、R32、R134a、丙烷的质量分数的增加能够使储能密度逐渐增加。研究结果可对未来建设CO_(2)混合工质储能循环工程应用奠定理论基础。In order to solve the problems of intermittency and instability of renewable energy,based on the supercritical compressed carbon dioxide energy storage(SC-CCES)system,the thermodynamic performance of the system was analyzed by using CO_(2)-based binary mixture as the circulating working medium.The energy storage performance of different mixtures in different proportions and the influence of key parameters such as compressor inlet temperature,heat source flow rate and pressure drop of high pressure throttle valve on the system round-trip efficiency and energy storage density were studied.The results show that the round-trip efficiency of the supercritical CO_(2)mixed working medium energy storage system increases with the increase of the mass fraction of krypton gas,and is higher than that of a single CO_(2)working medium.With the increase of the mass fraction of isobutane,R32,R134a and propane,the energy storage density will gradually increase.The research results lay a theoretical foundation for the future application of CO_(2)mixed working medium energy storage cycle project.

关 键 词：超临界二氧化碳 二元混合物 建模仿真 热力学分析 

分 类 号：TK123[动力工程及工程热物理—工程热物理]