Fluidized-Bed combustion is an attractive option to conventional pulverized coal combustion because not only is it relatively fuel-flexible, but the low overall combustion temperature results in low NOX emissions, and by adding an acceptor such as limestone to the bed, sulfur can be captured as a sulfate, limiting the emission of SOX. Furthermore, the heat transfer characteristics of the bed are excellent. Generally, an in-bed heat exchanger is used to control the temperature of the bed and to remove part of the heat of combustion. However, the in-bed environment is more aggressive than had originally been supposed. Sulfidation-oxidation corrosion of metal surfaces can occur at temperatures above approximately 600°C, and the bed particles can abrade or erode the metal surfaces. This erosive loss appears to be greater at lower temperatures. The combined effects of erosion and corrosion can result in particularly severe metal wastage, but the evidence for this interaction is not sufficient to permit generalization to be made about its effects.

Subject
Sulfur, Materials, Oxides, Emulsions, Tubes, Fluidized beds, Bubbling, Erosion, Coal, Oxygen, Deposit corrosion, Voids, Oxidation
© 1986 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1986
Association for Materials Protection and Performance (AMPP)
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