Design and Analysis of Solid Oxide Fuel Cell and Partial Heating S-CO2 Combined Power Generation System

The combination of solid oxide fuel cell (SOFC) and waste heat recovery technology can further improve the energy conversion efficiency of the system. In this study, a hybrid system combining SOFCs with a partial heating supercritical CO2 Brayton cycle (PHSCBC) is designed, where the exhaust gas from the SOFC system serves as a high-temperature heat source to drive the PHSCBC for co-generation. Electrochemical and thermodynamic models are established to comprehensively evaluate the energy and exergy of the integrated system. Through parameter analysis, the impact of the steam-to-carbon ratio, fuel flow rate, compressor inlet temperature and pressure, and pinch point temperature difference on the performance of the co-generation system is investigated. The system performance is optimized, and it is found that with a fuel flow rate of 0.54 mol/s and an air flow rate of 6.19 mol/s, the net power output, electrical efficiency, and exergy efficiency can reach 260.08 kW, 61.20%, and 56.54%, respectively. Increasing the fuel flow rate has proven beneficial in significantly enhancing the system's electrical efficiency. The proposed hybrid system demonstrates efficient, cost-effective, and clean co-generation capabilities, making it a promising advanced energy conversion technology with practical application prospects. ©2024 Chin.Soc.for Elec.Eng.