A variety of corrosive environments are encountered in flue gas desulfurization (FGD) systems. Some are intentional, such as the limestone slurry used in the absorber to remove SO2 gas, and others are unintentional, such as acid condensate in the outlet ducting and chimney. These acid condensate solutions are by far the most corrosive and most unpredictable. Condensate samples have been taken from various locations in an operating FGD unit and associated equipment. Actual samples have been taken from a low point in the bypass duct, the main outlet duct and the chimney flue drain sump. These samples were analyzed for pH, chloride and other constituents to determine the corrosivity of the fluids. These results were then related to performance of various alloy components in the system and to test samples exposed at representative locations in the Seminole Generating Station.

Subject
Weld attack, Filler metals, Materials performance, Nickel based alloys, Molybdenum alloys, Flue gas desulfurization, Condensates, Acidity, Liquids, Corrosion attacks, Pitting, Alloys, Chlorides
Keywords:
flue gas desulfurization, solutions, corrosion, acid, chloride, fluoride, welding, nickel alloys, INCONEL®* alloy 686 (UNS N06686), INCONEL®* alloy 622 (UNS NO6022)
© 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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