Research on the influence of CO2 storage capacity in a proposed Gas-CO2 combined storage-power cycle systems

As technology advances, improving energy utilization and structures has become a global priority. Key research areas now include Gas-supercritical CO2 combined cycles and compressed CO2 energy storage, essential for power system stability. Current studies mainly address the performance of these systems, with limited research on integrating them with thermoelectricity. Most investigations focus on the Brayton cycle, with minimal exploration of the Ericsson cycle. Based on the above issues, this article proposes a model for a Gas-compression CO2 co-storage and power generation system based on the approximate Ericsson cycle for use in distributed energy systems. The model was established using the ebsilon software platform, and simulation experiments were conducted with different storage capacities. Output parameters of relevant system components were obtained, and subsequent data processing and analysis were performed using Origin software. The study concludes that, under constant gas turbine power generation rates, environmental temperatures, and CO2 compression power generation times, increasing storage tank capacity has a relatively limited impact on CO2 cycle efficiency and overall system efficiency. However, larger storage tank capacities significantly enhance overall power generation efficiency, exhaust gas utilization rates, and primary energy utilization rates of the system. Thus, the power generation system demonstrates improved thermodynamic performance and achieves cascaded energy utilization.