Abstract
Compressed CO2 energy storage is a new type of energy storage with high energy storage density and a compact structure. Understanding the system's dynamic operational characteristics is crucial for optimizing parameters and developing control strategies. We established two dynamic compressed supercritical CO2 energy storage systems (SC-CCESs) without additional cold and heat sources and simulated their performance under design conditions. The results show that the single-stage system outperforms the double-stage system. The single-stage system is simulated from design conditions to periodic dynamic operating conditions. Energy and exergy analyses of the single-stage compression system were conducted, confirming that the model aligns with the first and second laws of thermodynamics. The dynamic behavior of the compressor, turbine, and storage tanks was analyzed, and a sensitivity analysis of key system parameters was performed. After optimization, the system's RTE improved to 63.35 %, a 3.09 % points increase, and the exergy loss decreased by 10.37 % points.
Published Version
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