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.",
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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

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AU - Halinen, M.

AU - Pennanen, Jari

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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.

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KW - mass transport

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KW - stack

KW - testing

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