Onboard fuel cell system and method of discharging hydrogen-off gas

a fuel cell and fuel cell technology, applied in the field of onboard fuel cell systems and methods of discharging hydrogenoff gas, can solve the problems of hydrogen-off gas catching fire and not much attention, and achieve the effect of reducing the concentration of hydrogen smoothly
US20080070090A1Inactive Publication Date: 2008-03-20TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
TOYOTA JIDOSHA KK
Publication Date
2008-03-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

Consumed hydrogen-off gas is discharged from a fuel cell via a hydrogen-off gas exhaust flow passage. Consumed oxygen-off gas is discharged from the fuel cell via an oxygen-off gas exhaust flow passage. The oxygen-off gas flowing through the oxygen-off gas exhaust flow passage and the hydrogen-off gas flowing through the hydrogen-off gas exhaust flow passage are mixed and diluted in a mixing portion. The gases mixed in the mixing portion flow into a combustor via a gas-liquid separator. The combustor, which includes a platinum catalyst, causes hydrogen contained in the mixed gases to react with oxygen by combustion and further reduces the concentration of hydrogen contained in the mixed gases. The mixed gases whose concentration of hydrogen has been reduced by the combustor is discharged to the atmosphere.
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Description

INCORPORATION BY REFERENCE

[0001] The disclosures of Japanese Patent Applications No. 2001-10538 filed on Jan. 18, 2001 and No. 2001-181092 filed on Jun. 15, 2001, each including the specification, drawings and abstract, are incorporated herein by reference in their entirety. BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The invention relates to an onboard fuel cell system that is suited to be installed in vehicles such as automobiles and the like, and to a method of discharging hydrogen-off gas.

[0004] 2. Description of Related Art

[0005] Fuel cells, which generate electric power by being supplied with hydrogen gas from high-pressure hydrogen gas tanks, hydrogen-occluding alloy tanks, or the like, exhibit high energy efficiency and thus are promising as a power source for electric vehicles and the like.

[0006] In the case where such a fuel cell is used as a power source for a vehicle, the vehicle requires being equipped with a fuel cell system including not on...

Claims

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