| 摘要 |
Water contained in cathode effluent from a cathode ( 1 B) of the fuel cell power plant is condensed by a condenser ( 8 ) and recovered to a water tank ( 10 ). Water in the water tank ( 10 ) is supplied from a pump ( 17 ) to a humidifier ( 4 ) which humidifies hydrogen-rich gas supplied to an anode ( 1 A) via a water passage ( 9 B). When the power plant stops operating, a controller ( 30 ) first recovers water in the water passage ( 9 B) to the water tank ( 10 ). Also, the freezing probability of the water passage ( 9 B) is determined from the temperature detected by an outside air temperature sensor ( 31 ), and a wait time is set according to the freezing probability. By opening a drain valve ( 15 ) and draining residual water in the water passage ( 9 B) after the wait time has elapsed, freezing of the water passage ( 9 B) can be prevented with a minimum water drainage amount.
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