Abstract
A high temperature metallic expansion joint used in a circulating fluidized-bed boiler is described. The boiler is fired principally with coal as well as the sludge from the de-ink process used for processing recycled paper. The expansion joint consisted of an inner metallic liner using a Ni-Co-Cr-Si alloy (UNS N12160) and two expansion bellows made of Type 321SS. The performance history of four expansion joints is described. One of the expansion joints failed due to the failure of a stainless steel bellows. Metallurgical evaluation of the failed stainless steel bellows is discussed; and the performance of the Ni-Co-Cr-Si alloy inner liner after five months of service is reported.
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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