REHEAT STAGE STUDY OF SALT CAVERN COMPRESSED AIR ENERGY STORAGE SYSTEM

Li Xichen; Zhou Lingmin; Shou Enguang; Zhang Heng; Hua Liuyuan; Cai Guozheng

doi:10.19912/j.0254-0096.tynxb.2024-1326

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 60-66. DOI: 10.19912/j.0254-0096.tynxb.2024-1326

REHEAT STAGE STUDY OF SALT CAVERN COMPRESSED AIR ENERGY STORAGE SYSTEM

Li Xichen, Zhou Lingmin, Shou Enguang, Zhang Heng, Hua Liuyuan, Cai Guozheng

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Abstract

A system calculation program for the full cycle process of energy storage and release was written by Python for a salt cavern compressed air energy storage （CAES） project. The effects of the highest storage gas pressure, expansion throttle pressure, compressor discharge temperature, and reheat stages on the characteristics of the salt cavern CAES were studied. The results show that there is an optimal highest storage gas pressure and expansion throttle pressure for CAES with the same reheat stage. At this time, the total compression power consumption is the smallest and the conversion efficiency is highest. The system conversion efficiency increases with the increase of the compressor discharge temperature for CAES with the same reheat stage, but the change trend slows down. The one-stage reheat CAES with compressor discharge temperature of 400 ℃ has the smallest compressor work consumption, the lowest gas consumption rate, and the highest conversion efficiency. The highest conversion efficiency is 71.43%, which is 6.48% higher than that of the three-stage reheat type.

Key words

compressed air energy storage / underground gas storage / conversion efficiency / reheat stages / air storage pressure / throttle pressure

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Li Xichen, Zhou Lingmin, Shou Enguang, Zhang Heng, Hua Liuyuan, Cai Guozheng. REHEAT STAGE STUDY OF SALT CAVERN COMPRESSED AIR ENERGY STORAGE SYSTEM[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 60-66 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1326

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