A 25kW onboard methanol fuel processor has been developed to be integrated in a fuel cell hybrid vehicle. The fuel processor consists of a methanol steam reformer which converts methanol to hydrogen-rich gas mixture, and two metal membrane modules which clean up the gas mixture to high purity hydrogen. Unlike other fuel processors, this metal membrane-type fuel processor produces highly pure hydrogen, over 99.999% purity, and the CO content is always maintained below 1 ppm regardless of the operating conditions. Supply of such high purity hydrogen enables maximum electric generation efficiency as well as the enhanced lifetime of fuel cell stacks. Moreover, the use of pure hydrogen opens the possibility that the fuel cell stack can run dead-end, which means it can run without bleeding-Off the anode gas, due to the absence of the impurity accumulation in the stack. In this fuel processor, the operating condition of the reformer and the metal membrane module is nearly the Same, so that operation is simple and the Overall system construction is compact by eliminating the extensive temperature control of the intermediate gas streams. The recovery of hydrogen in the metal membrane units is maintained at 70 - 75% and the un-recovered 20-30% hydrogen is recycled to catalytic combustion zone and to supply heat for the methanol steam reforming reaction. The thermal efficiency of the fuel processor is about 75% and the inlet air pressure can be as low as 4 psi. This fuel processor is under integration with a 25kW polymer electrolyte membrane fuel cell (PEMFC) unit and the complete set of fuel cell engine is going to be installed in a fuel cell hybrid passenger vehicle to perform the road test. This program is performed by the financial support of the Korean Government and in cooperation with Hyundai Motor Company.


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    Title :

    Metal membrane integrated methanol onboard fuel processor for fuel cell hybrid vehicle


    Additional title:

    Methanolreformer mit Metallmembran für ein Hybridfahrzeug mit Brennstoffzelle


    Contributors:


    Publication date :

    2002


    Size :

    9 Seiten, 6 Bilder, 1 Tabelle, 11 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English





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