Analysis of Leakages in a Solid Oxide Fuel Cell Stack in a System Environment

M. Halinen (Corresponding Author), Jari Pennanen

    Research output: Contribution to journalArticleScientificpeer-review

    11 Citations (Scopus)

    Abstract

    A solid oxide fuel cell (SOFC) stack can exhibit both anodic and cathodic leakages, i.e. a fuel leak from the anode side and an air leak from the cathode side of the stack, respectively. This study describes the results of an in-situ leakage analysis conducted for a planar SOFC stack during 2000 hours of operation in an actual system environment. The leakages are quantified experimentally at nominal system operating conditions by conducting composition analysis and flow metering of gases for both fuel and air subsystems. Based on the calculated atomic hydrogen-to-carbon ratio of the fuel and air gases, it is found that the fuel leakages are mostly selective by nature: the leaking fuel gas does not have the same composition as the fuel system gas. A simple diffusive leakage model, based on the leakage being driven by concentration differences weighted by diffusion coefficients, is applied to quantify the amount of leakages. The leakage model provides a good correspondence with the experimental results of the gas analysis.
    Original languageEnglish
    Pages (from-to)434-444
    JournalFuel Cells
    Volume15
    Issue number2
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Solid oxide fuel cells (SOFC)
    Leakage (fluid)
    Air
    Gases
    Fuel systems
    Gas fuel analysis
    Gas fuels
    Chemical analysis
    Anodes
    Cathodes
    Hydrogen
    Carbon

    Keywords

    • diagnosis
    • experimental results
    • fuel cell system
    • leakage
    • mass transport
    • solid oxide fuel cell
    • stack
    • testing

    Cite this

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    title = "Analysis of Leakages in a Solid Oxide Fuel Cell Stack in a System Environment",
    abstract = "A solid oxide fuel cell (SOFC) stack can exhibit both anodic and cathodic leakages, i.e. a fuel leak from the anode side and an air leak from the cathode side of the stack, respectively. This study describes the results of an in-situ leakage analysis conducted for a planar SOFC stack during 2000 hours of operation in an actual system environment. The leakages are quantified experimentally at nominal system operating conditions by conducting composition analysis and flow metering of gases for both fuel and air subsystems. Based on the calculated atomic hydrogen-to-carbon ratio of the fuel and air gases, it is found that the fuel leakages are mostly selective by nature: the leaking fuel gas does not have the same composition as the fuel system gas. A simple diffusive leakage model, based on the leakage being driven by concentration differences weighted by diffusion coefficients, is applied to quantify the amount of leakages. The leakage model provides a good correspondence with the experimental results of the gas analysis.",
    keywords = "diagnosis, experimental results, fuel cell system, leakage, mass transport, solid oxide fuel cell, stack, testing",
    author = "M. Halinen and Jari Pennanen",
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    language = "English",
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    pages = "434--444",
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    Analysis of Leakages in a Solid Oxide Fuel Cell Stack in a System Environment. / Halinen, M. (Corresponding Author); Pennanen, Jari.

    In: Fuel Cells, Vol. 15, No. 2, 2015, p. 434-444.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Analysis of Leakages in a Solid Oxide Fuel Cell Stack in a System Environment

    AU - Halinen, M.

    AU - Pennanen, Jari

    PY - 2015

    Y1 - 2015

    N2 - A solid oxide fuel cell (SOFC) stack can exhibit both anodic and cathodic leakages, i.e. a fuel leak from the anode side and an air leak from the cathode side of the stack, respectively. This study describes the results of an in-situ leakage analysis conducted for a planar SOFC stack during 2000 hours of operation in an actual system environment. The leakages are quantified experimentally at nominal system operating conditions by conducting composition analysis and flow metering of gases for both fuel and air subsystems. Based on the calculated atomic hydrogen-to-carbon ratio of the fuel and air gases, it is found that the fuel leakages are mostly selective by nature: the leaking fuel gas does not have the same composition as the fuel system gas. A simple diffusive leakage model, based on the leakage being driven by concentration differences weighted by diffusion coefficients, is applied to quantify the amount of leakages. The leakage model provides a good correspondence with the experimental results of the gas analysis.

    AB - A solid oxide fuel cell (SOFC) stack can exhibit both anodic and cathodic leakages, i.e. a fuel leak from the anode side and an air leak from the cathode side of the stack, respectively. This study describes the results of an in-situ leakage analysis conducted for a planar SOFC stack during 2000 hours of operation in an actual system environment. The leakages are quantified experimentally at nominal system operating conditions by conducting composition analysis and flow metering of gases for both fuel and air subsystems. Based on the calculated atomic hydrogen-to-carbon ratio of the fuel and air gases, it is found that the fuel leakages are mostly selective by nature: the leaking fuel gas does not have the same composition as the fuel system gas. A simple diffusive leakage model, based on the leakage being driven by concentration differences weighted by diffusion coefficients, is applied to quantify the amount of leakages. The leakage model provides a good correspondence with the experimental results of the gas analysis.

    KW - diagnosis

    KW - experimental results

    KW - fuel cell system

    KW - leakage

    KW - mass transport

    KW - solid oxide fuel cell

    KW - stack

    KW - testing

    U2 - 10.1002/fuce.201400072

    DO - 10.1002/fuce.201400072

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    JO - Fuel Cells

    JF - Fuel Cells

    SN - 1615-6846

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    ER -