Thermodynamics and Exergy Analysis on the Oxyfuel Combustion Integrated with Supercritical CO2 Power Cycle System

Abstract

In the context of global energy transition and environmental sustainability, the clean combustion of traditional energy sources has become increasingly important. The oxyfuel combustion integrated with the supercritical CO₂ (sCO₂) cycle system presents a viable solution. In this work, developed a modular system is developed for oxyfuel combustion integrated with the sCO₂ cycle and simulated using Python alongside Aspen Plus. The results show that the boiler eficiency η_b, sCO₂ cycle efficiency ${\eta }_{{\text{sCO}}_2}$, and electrical efficiency η_e of the system are 93.08, 48.4, and 35.9%, respectively. The power consumption of air separation unit and compression purification unit accounts for 25.8% of the total power. The exergy analysis results show that the boiler has the highest exergy loss, which is 70.2%, followed by the high-temperature recuperator. Afterward, the system is connected to renewable energy sources and carried out retrofit. The analysis shows that the power generation efficiency increases by 8.5% and the exergy efficiency increases by 5%. Additionally, the system can absorb electricity generated by 434 MW of renewable energy for energy storage. These results indicate that the system has promising application prospects in areas with ample sunlight, as well as in regions experiencing drought and water scarcity.