| 摘要 |
Fuel cell device comprising a fuel cell assembly with at least one polymer electrolyte membrane fuel cell and a fuel delivery means for providing a fuel flow. The device is provided with means for pre burning adapted to burn fuel entering the fuel cell assembly during the start up phase until the fuel flow is increased to a predetermined level and/or the oxygen concentration is decreased to a predetermined level. A method of operating the assembly comprises the steps of initiating the start up phase by causing the fuel delivery means to deliver a fuel flow, whereby a means for pre burning burns off fuel entering the fuel cell assembly, monitoring the fuel flow and/or the oxygen concentration and when the fuel flow is increased to a predetermined level and/or the oxygen concentration is decreased to a predetermined.
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