Thermodynamic and economic analysis of liquid nitrogen and liquid air hybrid energy storage system
The intermittency and volatility of renewable energy poses significant challenges to stable operation of power grids.Energy storage technology can address these issues effectively.Liquid air energy storage technology offers significant advantages of high energy storage density,being unconstrained by geographical conditions and atmospheric pressure storage.However,its round-trip efficiency is relatively low.To solve this problem,a liquid nitrogen and liquid air hybrid energy storage system(N-LAES)is proposed.By charging liquid nitrogen during energy release process,the gas flow in the expander increases,and gas pressure in front of the expander rises as well,thus the system's round-trip efficiency increases.A thermodynamic model is developed,and the analysis results indicate that,for a typical scale N-LAES,the round-trip efficiency is increased to 66.47%compared with 56.90%for a standalone LAES.The net present value at the 30th year increases to 120213500 yuan,compared with 58077400 yuan for a standalone LAES,and the levelized cost of storage decreases to 0.8094 yuan/(kW·h)from 0.8972 yuan/(kW·h)for a standalone LAES.These findings demonstrate that both the thermodynamic and economic performance of the N-LAES is superior to that of the standalone LAES,offering a new approach for development of the liquid air energy storage technology.
liquid air energy storageliquid nitrogenthermodynamic analysiseconomic analysis
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