| 摘要 |
Provided is a fuel cell system using the dead end method and capable of exhausting impurities accumulated at the anode side while suppressing the oxidization of carbon. In the fuel cell system (1), a fuel cell (2) is operated in the state that the fuel off gas flow path (8) is closed. When q purge valve (9) is opened, impurities accumulated in the flow path (8) are exhausted. If the cell voltage measured by voltage measuring means (11) exceeds a predetermined value, purge limit means (13) is operated so that no purge is performed. Here, if it is assumed that X is the cathode potential at which carbon is oxidized and Y is the maximum value of the anode potential, the predetermined value can be defined as (X−Y).
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