000136109 001__ 136109
000136109 005__ 20240711092244.0
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000136109 020__ $$a978-3-89336-551-7
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000136109 041__ $$aGerman
000136109 082__ $$a333.7
000136109 082__ $$a620
000136109 1001_ $$0P:(DE-Juel1)VDB7767$$aWeber, Christian$$b0$$eCorresponding author$$gmale$$ufzj
000136109 245__ $$aUntersuchungen zum Alkaliverhalten unter Oxycoal-Bedingungen
000136109 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2008
000136109 300__ $$aVII, 143, XII S.
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000136109 4900_ $$0PERI:(DE-600)2445288-9$$aSchriften des Forschungszentrums Jülich . Reihe Energie & Umwelt / Energy & Environment$$v24
000136109 500__ $$aRecord converted from JUWEL: 18.07.2013
000136109 520__ $$aOxycoal processes are promising power plant concepts which would allow easy CO$_{2}$ removal from the exhaust products. These processes are based on the combustion of coal with recirculated flue gas that has been enriched in oxygen. To ensure the energy efficiency the oxygen may be provided by a high temperature oxygen membrane. Because of the high partial pressure of CO$_{2}$ in the flue gas, the hot gas chemistry and ash behaviour of the system change in comparison to conventional air blown systems. The aim of the present work was to examine the effects of these changes concerning the condensation and stability of alkali metal containing ash and slag phases. The results led to an evaluation of the fouling and corrosion potential that is given by these phases. Thermodynamic modelling calculations have been made to characterise the alkali containing ash and slag phases that condensate in the process at different combustion conditions, as well as to investigate the interaction between these phases and nickel base alloys of a future power plant. Experimental investigations with conditions of an oxycoal process demonstrated the release of alkali metals, chlorine and sulphur during coal combustion, the sorption of the alkali metals on solid alumosilicates, the condensation of ashes and the interaction between these ashes and materials of filter candles. The results of the experiments complement and generally affirm the results of the modelling calculations. It has been shown that the stability of alkali metal containing sulphates, chlorides and carbonates is depending on one hand on the oxygen content of the combustion gas, on the other hand on the silicon and aluminium content of the coal. According to the $\lambda$-value and the used type of coal a certain risk of sulphate or carbonate induced hot corrosion has to be considered for metal materials, especially nickel base alloys. Further on, it has been found out, that by the use of coals, which are poor in silicon and aluminium, the formation of alkali metal containing ashes and solid or liquid slag may cause malfunction or even the destruction of filter candles. Finally the investigations show that an effective hot flue gas cleaning concerning the alkali metals is a requirement to protect the high temperature oxygen membrane from fouling and corrosion, if the membrane operates at the same or slightly lower temperature as the gas cleaning. Results reveal that the use of solid alumosilicates as sorbent is a feasible option for this purpose.
000136109 540__ $$aNeither this book nor any part of it may be reproduced or transmitted in any form or by any  means, electronic or mechanical, including photocopying, microfilming, and recording, or by any information storage and retrieval  system, without permission in writing from the publisher.
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000136109 9141_ $$y2013
000136109 9201_ $$0I:(DE-Juel1)VDB810$$kIEF-2$$lWerkstoffstruktur und Eigenschaften$$x0
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