Abstract
To study the operational characteristics of the subsurface part of the compressed CO2 energy storage in aquifers under different energy storage cycles, two daily and two weekly cycles for energy storage are designed, respectively. The whole process consisting of a two-year initial filling period and a one-year cyclic injection-production period is simulated. The results show that a total of 1.5552 million tons of CO2 can be stored in the initial filling period under the design condition. Sufficient initial fill can provide continuous pressure support for the subsequent injection and production cycles, and the output pressure and temperature are appropriate for electricity generation for one year in both the two daily and the two weekly cycles. The power generation process of the system in the two daily cycles and weekly cycles has a high production flow rate, and the average mass flow loss of daily and weekly cycles is about 0.3 % and 1 %, respectively. Due to the replenishment effect of geothermal energy, the average energy efficiencies in the whole process in the low- and high-pressure reservoirs under the two cycles are both higher than 100 %. These findings indicate that achieving good performance is possible for various long-duration energy storages.
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