| 摘要 |
Provided is a fuel cell system using the dead end method and capable of e xhausting impurities accumulated at the anode side while suppressing the oxi dization 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 va lve (9) is opened, impurities accumulated in the flow path (8) are exhausted . If the cell voltage measured by voltage measuring means (11) exceeds a pre determined value, purge limit means (13) is operated so that no purge is per formed. Here, if it is assumed that X is the cathode potential at which carb on is oxidized and Y is the maximum value of the anode potential, the predet ermined value can be defined as (X - Y). |
