Ten flue gas desulfurization (FGD) scrubber towers in Units 1 and 2 of the double-loop limestone scrubber complexes at the Laramie River Station of the Missouri Basin Power Project were fabricated from chromium-nickel-molybdenum-iron alloys--904L, 316L, 317L, Alloy 825, Alloy G, and Alloy 625. The performance of these alloys has been essentially corrosion-free in the upper quencher, absorber, outlet duct, inlet duct, and dampers of the scrubber towers.

Severe attack of 904L has been experienced in the quencher sump tank areas adjacent to welds, in areas of heat tint, in areas of weld spatter, in areas of heavy grinding and scratch marks, bepeath paint, and in the free-field portion of some plates.

The quencher sumps were repaired with ENiCrMo-3 welding rods. The welds were then pickled and passivated with a nitric-hydrofluoric acid mixture. For long-term performance, each of the quencher sumps has-been retrofitted with electrochemical protection licensed as Papritection.® This supplemental protection has performed well since installation and welding repairs in the quencher sumps have virtually ceased.

Subject
Weld attack, Slurry, Corrosion rate, Molybdenum alloys, Steel coupons, Flue gas desulfurization, Scrubbers, Repair, Heat, Towers, Corrosion protection, Stainless steel, Chlorides
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.