Abstract
Catastrophic corrosion of reheater tube spacers in boiler of a 350 MW electric power plant occurred after one year of service. Stainless steel 304 and 309 rods and plates of spacers were severely wasted by the contact of molten fuel oil ash rich in vanadium and sulfur. Operating conditions and particular behavior of fuel oil ash deposits on the rods and plates of the spacers created an environment which alternated from carburizing to oxidizing. SEM-EDS and WDS, microhardness and optical microscope measurements and observations, and plant inspection data are presented to exhibit the effect of the alternation carburizing and oxidizing conditions.
Subject
Sulfur,
Carburization,
Materials,
Tubes,
Vanadium,
Rods,
Microhardness,
Reheaters,
Boilers,
Oxygen,
Carbon,
Deposit corrosion,
Stainless steel
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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