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Operating Experience and Results from 3310 hours of Operation of a Biogas-powered 5 kW SOFC System in GlashusEtt
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Energiprocesser, Energy Processes)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Tillämpad elektrokemi, Applied Electrochemistry)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Energiprocesser, Energy Processes)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Energiprocesser, Energy Processes)ORCID iD: 0000-0002-0635-7372
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(English)Manuscript (preprint) (Other academic)
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-13218OAI: oai:DiVA.org:kth-13218DiVA: diva2:322207
Note

QC20100707

Available from: 2010-06-04 Created: 2010-06-04 Last updated: 2016-05-18Bibliographically approved
In thesis
1. Fuel Cells and Biogas
Open this publication in new window or tab >>Fuel Cells and Biogas
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis concerns biogas-operated fuel cells. Fuel cell technology may contribute to more efficient energy use, reduce emissions and also perhaps revolutionize current energy systems. The technology is, however, still immature and has not yet been implemented as dominant in any application or niche market. Research and development is currently being carried out to investigate whether fuel cells can live up to their full potential and to further advance the technology. The research of thesis contributes by exploring the potential of using fuel cells as energy converters of biogas to electricity.

The work includes results from four different experimental test facilities and concerns experiments performed at cell, stack and fuel cell system levels. The studies on cell and stack level have focused on the influence of CO, CO2 and air bleed on the current distribution during transient operation. The dynamic response has been evaluated on a single cell, a segmented cell and at stack level. Two fuel cell systems, a 4 kW PEFC system and a 5 kW SOFC system have been operated on upgraded biogas.

A significant outcome is that the possibility of operating both PEFCs and SOFCs on biogas has been established. No interruptions or rapid performance loss could be associated with the upgraded biogas during operation. From the studies at cell and stack level, it is clear that CO causes significant changes in the current distribution in a PEFC; air bleed may recover the uneven current distribution and also the drop in cell voltage due to CO and CO2 poisoning. The recovery of cell performance during air bleed occurs evenly over the electrode surface even when the O2 partial pressure is far too low to fully recover the CO poisoning. The O2 supplied to the anode reacts on the anode catalyst and no O2 was measured at the cell outlet for air bleed levels up to 5 %.

Reformed biogas and other gases with high CO2 content are thus, from dilution and CO-poisoning perspectives, suitable for PEFC systems. The present work has enhanced our understanding of biogas-operated fuel cells and will serve as basis for future studies.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. vi, 61 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2010:20
Keyword
air bleed, biogas, carbon dioxide, carbon monoxide, current distribution, dilution, efficiency, energy conversion, energy systems, experimental, fuel cell, fuel cell systems, PEFC, poisoning, reformate, SOFC
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-13219 (URN)978-91-7415-650-8 (ISBN)
Public defence
2010-06-15, F3, Lindstedtsvägen 26, KTH, Stockholm, 13:00 (Swedish)
Opponent
Supervisors
Note
QC20100708Available from: 2010-06-04 Created: 2010-06-04 Last updated: 2010-07-08Bibliographically approved

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Alvfors, PerLindbergh, Göran

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