In order to meet more stringent EPA guidelines, the coal-fired power industry must now build or retrofit their facilities with flue gas desulfurization (FGD) systems. A critical part of these systems is the FGD absorber. A common building material for the absorbers has been duplex UNS S32205/S31803 and UNS S32550 alloys; however, the UNS S32205/S31803 alloy is showing signs of premature corrosion throughout the industry. The root cause of this corrosion is still under investigation, but with some absorbers lasting less than 18 months, a repair regimen is sorely needed. This paper will discuss the issues surrounding UNS S32205/S31803 alloy corrosion as well as methods to rehabilitate and protect both old and new absorbers with epoxy vinyl ester polymer lining. The paper will also review the proper cleaning, surface preparation, application process, and choice of epoxy vinyl ester polymer lining to protect UNS S32205/S31803 alloy and prevent its premature breakdown in this environment.

Subject
Coating application, Materials, Corrosion resistant alloys, Stainless alloys, Flue gas desulfurization, Flue gas, Surface preparation, Polymers, Epoxy vinyl ester, Stainless steel, Alloys, Lining, Resins
Keywords:
Flue gas desulfurization, FGD, flue gas, desulfurization, absorbers, duplex UNS S32205/S31803 alloy, epoxy vinyl ester polymer lining, vinyl ester
© 2013 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).
2013
Association for Materials Protection and Performance (AMPP)
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