| 摘要 |
PROBLEM TO BE SOLVED: To provide a solid oxide fuel cell achieving high comprehensive energy efficiency during stable operation maintaining thermal independence.SOLUTION: A solid oxide fuel cell 1 comprises a fuel cell module 2, fuel supply means 38, a combustion unit 18 for applying heat by burning a residual fuel, a heat storage material 7, power demand detecting means, temperature detecting means, and output power controlling means for controlling the fuel supply means so that the fuel utilization efficiency is high when generated power is high, and low when the generated power is low. The controlling means comprises heat storage estimating means for estimating the amount of heat storage based on detected temperatures, and reduces the amount of fuel supply so that the fuel utilization efficiency is high with respect to the same amount of generated power when estimating that the heat storage material stores available heat. |
