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System performance comparison employing either partial oxidation or anode offgas circulation as reforming methods within a biogas SOFC system

: Heddrich, Marc; Reichelt, Erik; Albrecht, T.; Greß, C.; Jahn, Matthias; Näke, Ralf

Kusnezoff, Mihails (Scientific Advisory Committee) ; European Fuel Cell Forum -EFCF-:
11th European SOFC & SOE Forum 2014. Proceedings and additional information. CD-ROM : 1 - 4 July 2014, Kultur und Kongresszentrum Luzern, Lucerne, Switzerland
Luzern-Adligenswil: European Fuel Cell Forum, 2014
ISBN: 978-3-905592-16-0
Paper A1224, 7 pp.
European Solid Oxide Fuel Cell Forum (SOFC) <11, 2014, Luzern>
International Solid Oxide Fuel Cell and Electrolyser Conference <2014, Luzern>
Conference Paper
Fraunhofer IKTS ()

Recirculation of system or anode offgas is essential to the system concepts of many recent SOFC systems. Numerous system concepts are possible and have been theoretically analyzed. Few concepts were actually built, tested and reported about using either blowers or ejectors which have to be specifically designed for high temperature operation and dimensioned according to system concept and power range. Recirculation may permit independence from external reforming agents like air or water. In the case of a system with partial oxidation (POx) as reforming method anode offgas recirculation (AOGR) additionally leads to a significant increase in efficiency. The Fraunhofer IKTS biogas SOFC system was operated with real and synthetic biogas. A laboratory pump and a recuperator were utilized for AOGR. Experimental results of non- AOGR operation with varying methane content within the biogas will be presented. Furthermore transient and stationary experimental results of both POx and AOGR operation will be shown. POx operation was successfully confirmed for methane concentrations of xCH4 = 0.5…0.85. Furthermore the transition from POx to air-free AOGR could be demonstrated under real biogas operation.