跨临界二氧化碳储能系统的热力学性质研究

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中图分类号：TK02 文献标志码：A 文章编号：1002-4026（2025）05-0079-14

Abstract：Carbon dioxideenergy storage（CCES），which hasevolved fromcompressed air energy storage，ers advantages suchaszero carbon emisions，highenergy storagedensity，safety reliabity.To furtherutilize the advantages easyliquefactionthehighenergydensity carbon dioxide，atranscriticalcarbon dioxideenergystorage system（TC-CCES）with gas-iquid two-phase changes was proposed.The low-pressure storage tank in the system contains a gas-liquid mixturethatremains in transcriticalstatethroughout theoperation.Energy exergyanalyseswereconducted on TC-CCES， simulations were performed to obtain the dynamic properties thesystem during itsoperation.In addition，the impact theinitialtemperature the high-pressuregas storage tank onthe systemwasanalyzed.The study revealedthat loweringtheinitialtemperature thehigh-pressuretankenhanced thesystem eficiency.Whenthesystemran in a stable state，it achieved an efficiency 56.93% an energy storage density is ：

Keywords ：transcritical carbon dioxide energy storage；gas-liquid two-phase；energy conservation；exergic balance; dynamic properties

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