| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel cell system which can suppress excessive wet or lack of wet in a fuel cell by a simple structure. <P>SOLUTION: A dilution box 8 which dilutes a fuel gas exhausted from a circulation passage 21 with an oxidant gas is placed, and a purge valve 12 is placed between the circulation passage 21 and the dilution box 8. A concentration sensor 24 to detect a concentration of the fuel gas is placed in the downstream of the dilution black box 8. When the detected concentration is lower than a lower-limit threshold concentration relating to the excessive wet in the fuel cell 1 after opening the purge valve 12, an amount of fuel gas exhausted from the purge valve 12 is increased. In addition, when the detected concentration is higher than the upper-limit threshold concentration relating to lack of the wet in the fuel cell 1 after opening the purge valve 12, an amount of fuel gas exhausted from the purge valve 12 is decreased. <P>COPYRIGHT: (C)2010,JPO&INPIT |
