In 1989 a 4.2 MWe gas turbine was installed in a Swedish paper-mill. The gas turbine was fitted with water injection intended to reduce emissions of NOX. After 3380 operational running hours the gas turbine was stopped because of power loss and vibrations. The causes were found to be severe corrosion of the turbine blades and the guide vanes. The metallurgical investigation was carried out by the manufacturer and showed that the cause of the attack was excessively high levels of sodium in the combustion atmosphere. The high sodium levels could be attributed to the injection water. During the operational time the mean value of the sodium content in the injection water was calculated to be 4.3 ppm. In order to rectify this situation a water purification unit, a mixed-bed filter, has been installed. Since then, no hot corrosion attacks have occured.

Subject
Hot corrosion, Water, Materials, Gas turbines, Turbines, Condensates, Natural gas, Corrosion attacks, Filters, Sodium, Water quality, Water injection, Steam
Keywords:
Hot Corrosion, Gas Turbine, Alkali, Sodium, Water-Injection, Water Quality
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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