Effects of gas velocity on formation of carbon deposits on AS-SOFC fuel electrodes

  • Konrad Motylinski Institute of Power Engineering
  • Marek Skrzypkiewicz Institute of Power Engineering
  • Yevgeniy Naumovich Institute of Power Engineering
  • Michał Wierzbicki Institute of Power Engineering
  • Jakub Kupecki Institute of Power Engineering

Abstract

The elevated operating temperatures of solid oxide fuel cells (SOFC) create favorable kinetics for the oxidation of carboncontaininggas mixtures, which may include carbon monoxide and light organic compounds. The presence of carbon-basedcomponents in the fuel might result in the formation and deposition of soot on the surface of the anode in a fuel cell. Thisprocess depends on and is driven by the prevailing thermodynamic, kinetic and electrochemical conditions. The presentstudy was premised on the following: in addition to the aforementioned parameters providing for the operating conditions,gas velocity also affects the formation of deposits on the anode. The role of fuel gas velocity in the process was studiedexperimentally using 5 cm x 5 cm anode supported solid oxide fuel cells (AS-SOFC) at 750°C at velocities in the range 0.1to 0.9 m/s. It was found that carbon deposition was clearly observable approximately 24 hours after the necessary conditionswere attained. An intense stage of performance degradation typically lasts for a period of up to 60 hours. An increase in fuelflow velocity leads to an acceleration in the carbon deposition process. The correlation between velocity and cell degradationdue to this phenomenon was determined and the corresponding function was proposed.

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Published
2018-09-13
How to Cite
MOTYLINSKI, Konrad et al. Effects of gas velocity on formation of carbon deposits on AS-SOFC fuel electrodes. Journal of Power Technologies, [S.l.], v. 98, n. 4, p. 322–328, sep. 2018. ISSN 2083-4195. Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/1404>. Date accessed: 17 sep. 2021.
Section
Fuel Cells and Hydrogen

Keywords

Boudouard Reaction, Carbon Deposition, SOFC, Soot Formation

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