Fuel impurities such as sulfur, alkalies (Na, K), vanadium, and chlorine can play an important role in the formation of liquid phase deposits and are considered the main sources of fireside corrosion. Liquid phase deposits not only promote the accumulation of fly ash particles on heat transfer surfaces, but also provide electrolytes for electrochemical attack of metal tubes.

Many efforts have been made to minimize or control deposits and corrosion. These include boiler and burner designs, combustion control, fuel selection, mechanical cleaning using highly resistant alloys, and applying chemical additives. Additives can react with ash particles or slag constituents to modify deposit structure; inhibit the formation of liquid phase, corrosive compounds; and form a protective barrier on the tube surfaces.

Subject
Sulfur, Metal surfaces, Additives, Tubes, Vanadium, Furnaces, Sodium, Scale formation, Ash, Boilers, Coal, Deposit corrosion, Oil
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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