In terms of the system efficiency, it is very useful to apply the ejector into the fuel recirculation system of a fuel cell system since the ejector need no parasitic power to operate. In particular, the efficient recirculation of the unused oxygen for a submarine fuel cell is more important to determine the system efficiency due to the following reasons. The fuel cell stack for the submarine uses oxygen instead of air as the cathodic fuel because the submarine drives under the sea. Additionally, the submarine fuel cell generally uses the pressurized stack for the better electric performance. The mentioned conditions make to generate the significant amount of the water in the stack. Thus in case of the target submarine fuel cell, the oxygen utilization has designed less than 50 % for the better exhausting the generated waters. The oxygen utilization of 50 % in the whole operating range forces the entrainment ratio of the ejector to be more than one in the whole range. However, the conventional ejector using a constant nozzle can not afford to satisfy the critical requirement. To overcome the problem, the double-ejector and its control strategy acceptable in the whole operating range are designed. The performance of the proposed double-ejector is verified by the experiments based on the real operating conditions. Furthermore, the proposed design method can be used for the other fuel recirculation system of a large-scale fuel cell system with the critical requirement of the fuel utilization.


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    Title :

    Development of a double-ejector and its control system to reuse the oxygen for a submarine fuel cell


    Additional title:

    Entwicklung eines Doppelauswerfers und seines Regelsystems für die Wiederverwendung von Sauerstoff in einer U-Boot-Brennstoffzelle


    Contributors:


    Publication date :

    2008


    Size :

    4 Seiten, 3 Bilder, 5 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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