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| Hauptseite > IEK > IEK-2 > Sauerstofftransport und Degradationsverhalten von Hochtemperaturmembranen für CO$_{2}$-freie Kraftwerke |
| Hauptseite > IEK > IEK-2 > Sauerstofftransport und Degradationsverhalten von Hochtemperaturmembranen für CO$_{2}$-freie Kraftwerke |
| Book | PreJuSER-136214 |
2010
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-89336-630-9
Please use a persistent id in citations: http://hdl.handle.net/2128/3770
Abstract: This thesis deals with membranes for oxygen separation from air for high temperature application in fossil power plants within the scope of the oxyfuel-process. Different perovskite membrane materials (ABO$_{3- \delta}$) were investigated concerning the oxygen transport and their chemical stability under operation condition. The association between oxygen transport properties and both the thermodynamic boundary conditions as well as the material properties (membrane thickness and surface properties) was studied. One possibility to achieve higher oxygen fluxes through the membrane is to reduce the thickness. In this case the influence of surface processes on the overall permeation becomes noteworthy. The effect of different membrane surface modifications on the permeation rate was investigated. For example it could be confirmed, that a porous layer on the membrane surface significantly increases the permeation flux due to the compensation of surface exchange limitations. Beyond that, degradation processes during the operation under power plant condition were investigated. Special attention was attached to the influence of degradation on the permeation flux during long term operation. Thereby kinetic demixing of the membrane material was observed.
Keyword(s): carbon dioxide ; carbon dioxide acceptor process ; fossil fuel power plant ; high temperature materials ; membrane separation ; oxygen ; transport
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