High temperature corrosion of superheater (SH) and, specially, reheater (RH) is strongly dependent on metal temperature. In this work, a way to continuosly monitor the metal temperature of SH or RH, elements developed by the Instituto de Investigaciones Electricas (HE) is described and the effects of operating parameters on metal temperature are evaluated. Also, the effects the steamgenerator design and metal temperature on the corrosion rates have been investigated. In some steam generators, corrosion rates were reduced from 0.7 to 0.2 mm/y by changing the tube material and reducing the metal temperature. Also, the effect of metal temperature on the residual life of a 347H tube in a 158MW steam generator is evaluated. It is concluded that metal temperature is the most important parameter in controlling the high-temperature materials behaviour in boiler environments.

Subject
Materials, Corrosion rate, Oils, Tubes, Thermocouples, Steam generators, Metals, Wall thickness, Reheaters, Boilers, Creep, Elements, High temperature
Keywords:
Metal temperature, steam generator, superheater, reheater, corrosion rate, residual life
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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