Progress in new energy storage based on compressed carbon dioxide
Accelerating the deployment of renewable energy and building a new type of power system are important measures to address energy and environmental issues.Energy storage technology is an important equipment foundation of the novel power system.It can not only realize the transfer of energy over time and smooth the power output of renewable energy,but also balance the energy management at the supply side and the user side.First,the technical principles and application status of compressed carbon dioxide energy storage is summarized in this study.Subsequently,the storage configuration of the system is divided into seven categories based on the storage state of carbon dioxide.The performance characteristics and research progress of different storage configuration systems are summarized.Finally,the development direction of the compressed carbon dioxide energy storage system is predicted.(1)Compressed carbon dioxide energy storage is a new type of physical energy storage technology.Compared with compressed air energy storage,it has the advantages of large energy density and compact system,and has been widely concerned by scholars in recent years.Carbon dioxide has a critical point of 7.38 MPa/31.3℃and is more easily liquefied than air.In addition,carbon dioxide has the characteristics of low viscosity and high density,so compressed carbon dioxide energy storage systems are more compact compared to compressed air energy storage systems at the same power level.At present,carbon dioxide energy storage verification projects have been completed and put into operation both domestically and internationally.(2)According to the different carbon dioxide states in the low/high pressure storage device,the storage scheme of compressed carbon dioxide energy storage technology can be divided into seven types:gas-supercritical carbon dioxide storage,gas-liquid carbon dioxide storage,supercritical-supercritical carbon dioxide storage,liquid-supercritical carbon dioxide storage,liquid-liquid carbon dioxide storage,adsorption-liquid carbon dioxide storage and adsorption-supercritical carbon dioxide storage.(3)In the future technology development of compressed carbon dioxide energy storage,mainly focus on gas-liquid carbon dioxide storage compressed carbon dioxide energy storage technology and liquid-liquid carbon dioxide energy storage technology.Fully utilize the advantages of high cycle efficiency,simple system structure of compressed carbon dioxide energy storage technology with gas-liquid carbon dioxide storage and high energy density of compressed carbon dioxide energy storage technology with liquid-liquid carbon dioxide storage.(4)In terms of the diversified development of compressed carbon dioxide energy storage technology,the first is to implement the"renewable energy + compressed carbon dioxide energy storage"model to achieve sustainable and stable power supply of renewable energy,assist the operation of the grid,and reduce the phenomenon of abandoned light and power.The second is to conduct in-depth research on integrated systems based on compressed carbon dioxide energy storage technology,improving system performance and energy utilization rate by coupling ejector refrigeration cycles,organic Rankine cycles,etc.,which can achieve carbon dioxide condensation and waste heat reuse.At present,only a few compressed carbon dioxide energy storage verification projects have been completed,and the development of carbon dioxide energy storage technology should be accelerated at home and abroad to realize the promotion of compressed carbon dioxide energy storage technology from theory to practice,from concept research and development to project demonstration and ultimately achieving widespread application of compressed carbon dioxide energy storage technology.
new energy storagecompressed carbon dioxidestorage configurationheat storage mediumprogress
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