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New regulation strategies study of solar aided liquid air energy storage system under off-design conditions

机译：New regulation strategies study of solar aided liquid air energy storage system under off-design conditions

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摘要

Liquid air energy storage (LAES) is a large-scale physical energy storage system with high energy storage density. At present, the coupling matching regulation mechanism of the cold and thermal cycles is unclear under off-design conditions, which makes the stable and efficient operation of the LAES system difficult. New multivari-able control strategies for cold and thermal cycles are proposed based on the solar aided liquid air energy storage (SA-LAES) system. The study results show the "equal proportion cold recovery" strategy is superior to other strategies, improving the system performance and meeting the demand of the maximum capacity of the charging process. When the liquid air mass flow ratios are 0.7 and 0.4, the air liquefaction ratios increase by 20.20 and 86.43, and the round-trip efficiency (RTE) values increase by 19.44 and 84.86, respectively. The new thermal cycle control strategy achieves a good heat coupling matching and maximizes the discharging time and RTE in the zero-carbon environment. Under 70 load and 40 load, the discharging time increase by 16.26 and 53.83. RTE values increase by 16.28 and 53.84, respectively. Finally, the operation domains of SA-LAES at different molten salt temperatures are obtained with the optimal cold and thermal cycle strategies. The achievements in this paper will provide valuable reference for the stable operation of SA-LAES under off-design conditions.

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