The fireside corrosion behavior of a series of iron-base and nickel-base alloys, with potential for use as heat-exchanger tubes for an advanced-duty cycle in a pulverized coal combustor, has been investigated. Selected alloys have been exposed to the combustion gas environment in a utility boiler burning coal containing 1 percent sulfur, using internally cooled corrosion probes. The corrosion probes simulated metal temperatures expected in the advanced duty cycle and the probes were exposed up to 2000 hours. The metal loss data indicated that there was no accelerated corrosion but instead the alloys formed protective oxide scales with no internal corrosion and/or sulfidation. Analysis of the deposits formed on the specimens on the probes indicated that they contained salts which consisted of mixtures of sulfates and chlorides of alkali and alkaline earth metals. However, the amount of salts in the deposits was very samll and the salts did not appear to have been molten at the exposure temperatures. This is in direct contrast to the behavior of deposits formed at the lower superheater temperatures used in conventional steam cycles.

Subject
Corrosion resistant alloys, Stainless alloys, Probes, Nickel based alloys, Tubes, Metals, Weight loss, Scale formation, Boilers, Corrosion probes, Coal, 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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