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Co-Electrolysis CFY-Stack Operation and Integration for Carbon Capture and Utilization

: Kusnezoff, Mihails; Megel, Stefan; Rix, Christopher; Adam, Paul; Reichelt, Erik; Herz, Gregor; Jahn, Matthias; Trofimenko, Nikolai; Michaelis, Alexander


Eguchi, K. ; Electrochemical Society -ECS-:
Solid Oxide Fuel Cells 16 : September 8, 2019 - September 13, 2019, Kyoto, Japan
Pennington, NJ: ECS, 2019 (ECS transactions 91)
ISBN: 978-1-60768-874-7
ISBN: 978-1-62332-575-6
International Symposium on Solid Oxide Fuel Cells (SOFC) <16, 2019, Kyoto>
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
Fraunhofer IKTS ()
carbon capture; Fischer-Tropsch synthesis; electrolytes; electric power utilization; Electrolysis; co-electrolysis; stack performance; operation window; operating condition; methane content; gas conversion; gas composition; electrolyte-supported cells; solid oxide fuel cells (SOFCs)

The successful operation of CFY-stack with electrolyte supported cells with Ni/GDC electrode has been demonstrated in electrolysis and co-electrolysis mode at 75-85% gas conversion to provide reliable data for performance and degradation estimation. The difference of stack performance between electrolysis and coelectrolysis modes was <2%. The power consumption in steam and co-electrolysis operation was very similar and depends mainly on Nernst voltage of H2O/H2/CO2/CO containing gas composition. Gas conversion has only minor effect on power consumption over a wide operation window. SOE stack integration into carbon capture and utilization (CCU) unit for production of waxes using Fischer-Tropsch synthesis has been considered on system design level applying realistic efficiencies for internal heat utilization (heat losses). Non-converted syngas and short-chained by-products are recycled to the stack inlet and used for recovery. It has been shown that at T≥800°C a methane content of 7.5 mol-% in the feed gas is fully converted in the stack under co-electrolysis operating conditions.