Discrete ejector control solution design, characterization, and verification in a 5 kW PEMFC system

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    Abstract

    An ejector primary gas flow control solution based on three solenoid valves is designed, implemented and tested in a 5 kW proton exchange membrane fuel cell (PEMFC) system with ejector-based anode gas recirculation. The robust and cost effective combination of the tested flow control method and a single ejector is shown to achieve adequate anode gas recirculation rate on a wide PEMFC load range. In addition, the effect of anode gas inert content on ejector performance in the 5 kW PEMFC system is studied at varying load and anode pressure levels. Results show that increasing the inert content increases recirculated anode gas mass flow rate but decreases both the molar flow rate and the anode inlet humidity. Finally, the PEMFC power ramp-rate limitations are studied using two fuel supply strategies: 1) advancing fuel supply and venting out extra fuel and 2) not advancing fuel supply but instead using a large anode volume. Results indicate that the power of the present PEMFC system can be ramped from 1 kW to 4.2 kW within few hundred milliseconds using either of these strategies.
    Original languageEnglish
    Pages (from-to)16760-16772
    Number of pages13
    JournalInternational Journal of Hydrogen Energy
    Volume42
    Issue number26
    DOIs
    Publication statusPublished - 29 Jun 2017
    MoE publication typeA1 Journal article-refereed

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    Keywords

    • anode gas recirculation
    • ejector
    • ejector control
    • inert build-up
    • PEMFC
    • power ramp-up

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