SOFC and Gas Separation Membranes

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    Abstract

    How will the future, sustainable energy system look like? The answer to this difficult question depends on a number of technical but also political and socio-economic issues. Besides a massive demand to build up of power supply systems based on renewables, there is a strong need to reduce losses, increase the efficiency of power production processes from fossil fuels and also to consider carbon capture and sequestration (CCS). Solid oxide fuel cells (SOFCs) convert the chemical energy bound in a fuel directly into electrical energy at temperatures ranging from 600 to 1000 oC, depending on the materials used in the SOFCs. Due to the high efficiencies, the amount of CO2 emitted from carbon containing fuels is smaller compared to conventional energy production technologies based on fuel combustion. Furthermore, CO2 is formed at the anode side of the fuel cell together with steam, and thus separated from air. Subsequent separation and sequestration of CO2 is therefore easier on a SOFC plant than on conventional power plants based on combustion. Oxide ion conducting materials may be used for gas separation purposes with close to 100 % selectivity. They typically work in the same temperature range as SOFCs. Such membranes can potentially be used in Oxyfuel processes as well as in IGCC (Integrated Gasification Combined Cycle) power plants for supply of process oxygen, which may reduce cost of carbon capture and storage as dilution of the flue gas with nitrogen is avoided. Both technologies are very attractive for combination with biomass conversion. A brief status of the Risø DTU activities in the SOFC and membrane areas is presented. Ideas for the use of these technologies in a future more sustainable energy system will be discussed with special emphasis on their combination with biomass conversion and CCS-schemes.
    Original languageEnglish
    Title of host publicationEnergy solutions for CO2 emission peak and subsequent decline : Proceedings
    Number of pages316
    Place of PublicationRoskilde
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Publication date2009
    Pages153-161
    ISBN (Print)978-87-550-3783-0
    Publication statusPublished - 2009
    EventRisø International Energy Conference 2009 - Risø DTU, Roskilde, Denmark
    Duration: 14 Sep 200916 Sep 2009

    Conference

    ConferenceRisø International Energy Conference 2009
    LocationRisø DTU
    CountryDenmark
    CityRoskilde
    Period14/09/200916/09/2009
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number1712(EN)
    ISSN0106-2840

    Keywords

    • Fuel Cells and hydrogen
    • Ceramic Membranes
    • Membraner
    • Risø-R-1712(EN)
    • Risø-R-1712

    Cite this

    Hagen, A., Hendriksen, P. V., & Søgaard, M. (2009). SOFC and Gas Separation Membranes. In Energy solutions for CO2 emission peak and subsequent decline: Proceedings (pp. 153-161). Roskilde: Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi. Denmark. Forskningscenter Risoe. Risoe-R, No. 1712(EN)