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1. WO2007107836 - SYSTÈME DE PILE À COMBUSTIBLE ET PROCÉDÉ DE FONCTIONNEMENT POUR SYSTÈME DE PILE À COMBUSTIBLE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A fuel cell system comprising:
a fuel cell;
a fuel gas supply portion;
a fuel gas supply channel that supplies a fuel gas from the fuel gas supply portion to the fuel cell;
a fuel gas circulation channel that is connected to the fuel cell and to the fuel gas supply channel and that circulates the fuel gas discharged from the fuel cell by returning the fuel gas to the fuel gas supply channel for reuse;
a circulation pump provided on the fuel gas circulation channel so as to circulate the fuel gas;
a temperature detection portion that detects a temperature of the fuel cell system; a pump control portion that drives the circulation pump; and
a breakdown determination portion that determines whether the circulation pump has a breakdown,
wherein the breakdown determination portion determines that the circulation pump has a the breakdown if the temperature of the fuel cell system detected by the temperature detection portion is higher than or equal to a melting point of water and a rotation speed of the circulation pump driven by the pump control portion is less than a predetermined rotation speed.

2. The fuel cell system according to claim 1, further comprising :
a warmup portion that warms up the circulation pump,
wherein when fuel cell system is started, the warmup portion warms the circulation pump if the temperature of the fuel cell system detected by the temperature detection portion is less than the melting point of water.

3. The fuel cell system according to claim 2, further comprising an oxidizing gas supply portion that supplies an oxidizing gas to the fuel cell,
wherein if the temperature of the fuel cell system detected by the temperature detection portion is less than the melting point of water, the warmup portion causes the fuel gas supply portion and the oxidizing gas supply portion to supply the fuel gas and the oxidizing gas, respectively, to the fuel cell so as to cause the fuel cell to perform power generation so that the circulation pump is warmed by heat produced by the power generation.

4. The fuel cell system according to claim 3, wherein the circulation pump is disposed near the fuel cell.

5. The fuel cell system according to claim 3 or 4, wherein the circulation pump is disposed integrally with the fuel cell.

6. The fuel cell system according to any one of claims 2 to 5, further comprising:
a purge channel that discharges the fuel gas to outside the fuel cell system from the fuel gas circulation channel upstream of a position where the circulation pump is provided, in a circulating direction of the fuel gas;
a shut-off valve provided on the purge channel;
a valve control portion that performs an open-close control of the shut-off valve; and an oxidizing gas adjustment portion that adjusts a supply amount of the oxidizing gas supplied by the oxidizing gas supply portion to the fuel cell,
wherein the warmup portion, when causing the fuel cell to perform the power generation, increases an amount of power generation of the fuel cell by causing the valve control portion to open the shut-off valve so as to increase the supply amount of the fuel gas supplied to the fuel cell and causing the oxidizing gas adjustment portion to increase the supply amount of the oxidizing gas corresponding to the supply amount of the fuel gas.

7. The fuel cell system according to claim 6, further comprising:
an oxidizing gas discharge channel that discharges the oxidizing gas to outside the fuel cell system;
a diluter that is connected to the purge channel and to the oxidizing gas channel, and that dilutes hydrogen contained in the fuel gas by mixing the fuel gas with the oxidizing gas; and
a mixture gas discharge channel that discharges a mixture gas from the diluter.

8. The fuel cell system according to any one of claims 1 to 7, wherein the temperature detection portion detects a temperature of the circulation pump of the fuel cell system.

9. The fuel cell system according to claim 8, wherein the temperature detection portion estimates the temperature of the circulation pump from an atmospheric temperature.

10. An operation method for a fuel cell system including a fuel cell, a fuel gas supply portion, a fuel gas supply channel that supplies a fuel gas from the fuel gas supply portion to the fuel cell, a fuel gas circulation channel that is connected to the fuel cell and to the fuel gas supply channel and that circulates the fuel gas discharged from the fuel cell to the fuel gas supply channel for reuse, and a circulation pump provided on the fuel gas circulation channel so as to circulate the fuel gas, the operation method comprising:
detecting a temperature of the fuel cell system when the fuel cell system is started; warming the circulation pump if the detected temperature of the fuel cell system is less than a melting point of water;
driving the circulation pump; and
determining that the circulation pump has broken if the temperature of the fuel cell system is higher than or equal to the melting point of water and a rotation speed of the circulation pump is less than a predetermined rotation speed.