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.
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references
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