| 摘要 |
A hydrogen circulation device 4 circulates unused hydrogen gas, expelled from an outlet of a hydrogen electrode 1 a of a fuel cell 1 , to an inlet of the hydrogen electrode 1 a through a hydrogen gas circulation passage 3 . If load of a hydrogen circulation device 4 detected by a load detector 7 exceeds a given value, a purge valve controller 8 discriminates, that a quantity of nitrogen accumulated in a hydrogen circulation path ( 1 a, 3, 4 ) exceeds a given value, to open the purge valve while closing the purge valve 6 in the presence of judgment made, when the load of the hydrogen circulation device 4 drops below the given value, that purging of nitrogen is terminated. |
