具外部重組器之質子/氧離子傳導固態氧化物燃料電池系統分析

The numerical simulations of the proton and oxygen-ion conducting solid oxide fuel cell systems are implemented in this study. The polarization losses and cell performance under different operating conditions and fuel utilization rates are analyzed. The applicability of the intermediate-temperature pSOFC and high-temperature oSOFC are verified by the model of 1.2kW stacks. The efficiency of a SOFC system with the hot box components including afterburner, heat exchanger and external reformer is simulated. Due to the proton conduction effects, the efficiency of a methane fed pSOFC system is significantly affected by an excessive incoming fuel flow rate. Analogously, the oSOFC system is found to be more sensitive to the air flow rate than the pSOFC system. The results of this work provide the guidelines of operating conditions for the 1kW oSOFC and pSOFC systems under the fuel utilization of 65%, 75% and 85%.