Study on supercritical carbon dioxide energy storage system and its operating characteristics
As a novel energy storage method,compressed supercritical carbon dioxide(sCO2)energy storage offers several advantages,such as high energy storage density,compact structure,long service life,and negative carbon emissions.Therefore,it has a broad application prospect in the energy storage and conversion.In this study,a dynamic mathematical model for the compressed sCO2 energy storage system(SC-CCES)was established based on the mass conservation and energy conservation laws and the reliability of the model was verified.Additionally,dynamic simulations of the SC-CCES system with single-stage compression and single-stage expansion were performed using Matlab/Simulink.Under the designed operating conditions,the energy storage efficiency of the SC-CCES system was found to be 51.98%,with an energy storage density of 447.8 kWh/m3.The energy storage density of the SC-CCES system was more than 20 times higher than that of a traditional compressed air energy storage system.Furthermore,the impact of different high-pressure tank inlet pressures on system performance was analyzed.The results showed that the energy storage efficiency increases with the increase of the inlet pressure of the high-pressure storage tank,while the energy storage density is exactly the opposite.This study provides a basis for the development of compressed carbon dioxide energy storage.
compressed supercritical carbon dioxide energy storagedynamic simulationenergy conservationenergy density
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