| 摘要 |
This fuel cell system (1) monitors the temperature of an off-gas combusting unit (6) detected by a combustor temperature detecting unit (101) in a constant output operation state such as a rated operation state where a sweeping current of a cell stack (5) becomes constant, rather than directly measuring the fuel property, and controls the flow rate of the cathode gas so that the temperature of the off-gas combusting unit (6) reaches a target temperature. Moreover, the fuel cell system (1) determines the fuel property based on the variation of the flow rate of the cathode gas changed until the temperature of the off-gas combusting unit (6) reaches the target temperature and the temperature of the cathode gas. Thus, it is possible to simplify the configuration required for determining whether the fuel property has changed or not as compared to a conventional method of measuring a plurality of factors of the fuel property. |
