A cyclic reheat system for a wet flue gas desulfurization system extracts heat from the inlet flue gas and transfers this heat to the outlet flue gas. One method of achieving this uses tube-type heat exchangers in the inlet and outlet gas streams with a fluid (e.g., water) circulated between them. For high sulfur coal, questions of materials selection and cleaning methods of the inlet heat exchanger exist because of the potential for acid condensation. An inlet gas heat exchanger test apparatus was built and installed on a slipstream from a high-sulfur coal-fired power plant. Results obtained from the previously reported first 3061 hours of exposure indicated low corrosion rates for several stainless steels and that a water wash prevented solids buildup on the tubes. During the second exposure period of 3046 hours, with no cleaning employed, deposits were not extensive but severe corrosion was experienced beneath the deposits that accumulated.

Subject
Pits, Stainless alloys, Nickel based alloys, Tubes, Molybdenum alloys, Flue gas, Heat exchangers, Pitting, Zirconium alloys, Carbon steel, Deposit corrosion, Stainless steel, Titanium alloys
© 1985 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).
1985
Association for Materials Protection and Performance (AMPP)
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