Economic analysis of a compressed air energy storage system coupled with molten salt thermal storage system
As a large scale of physical energy storage technology,compressed air energy storage technology is widely used in consumption of renewable energy and peak shaving of power grids.A compressed air energy storage system coupled with molten salt thermal storage is designed,and the composite system is modeled using Ebsilon software.Based on the operating conditions of the energy storage system supplying hot water,steam,and electricity,the exergy efficiency,thermal efficiency,and economic performance under different operating modes are studied.The results indicate that,the composite system achieves the highest exergy efficiency(64.98%)at a storage pressure of 7 MPa and an exhaust temperature coefficient of 1.96.The highest thermal efficiency(91.55%)is attained at a storage pressure of 12 MPa.In the application scenario of combined heat,steam,and electricity cogeneration,the optimal energy storage duration is 6 hours.Additionally,at gas storage pressures of 7 MPa and 12 MPa,the optimal power generation durations are 6 hours and 8 hours.This research provides theoretical guidance for the study of cogeneration of power and heating using compressed air energy storage system coupled with molten salt thermal storage system.
molten salt thermal storagecompressed air energy storagecogeneration of power and heatingexergy efficiencythermal efficiency
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