It has been observed several times that metals in coal-burning fluidized beds may suffer accelerated sulfidation-oxidation corrosion at metal temperatures above 600°C or so. It is believed that this is related to local low-oxygen activity regions in the bed causing the dissociation of calcium sulfate to generate a high local sulfur activity. A series of 250-hour tests has been conducted in a small atmospheric pressure fluidized bed combustor, in which one process variable at a time has been changed. The results indicate that the corrosion is relatively insensitive to many of these variables. This is fortunate, in the sense that transient variations in bed operation will not induce catastrophic attack of resistant materials, but also implies that the corrosion is an intrinsic property of beds and cannot be eliminated by simple changes in design or operation.

Subject
Sulfur, Limestone, Partial pressures, Corrosion attacks, Fluidized beds, Bubbling, Metals, Scale formation, Sulfidation, Coal, Oxygen, Deposit corrosion, Alloys
© 1983 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).
1983
Association for Materials Protection and Performance (AMPP)
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