Achieving higher plant efficiencies in thermal power plants is one of the major global challenges from the viewpoint of reducing carbon dioxide emission levels, particularly in coal-fired boilers. To this end, the goal in the development of ultra supercritical (USC) coal-fired boilers is to increase steam temperature from current value of 600°C to 700°C. The key to achieving 700°C USC boilers lies in the development of higher creep rupture strength alloys such as Ni-based and Fe-Ni based alloys, which have capability of operating under high stresses at these higher temperatures. Other key requirements for these materials are high temperature corrosion resistance against coal ash corrosion and steam oxidation in super-heater and re-heater tubes used for USC boilers. In this paper, high temperature corrosion properties of several candidate alloys for 700°C USC boilers have been studied using laboratory tests.

Subject
Materials, Corrosion resistant alloys, Candidate materials, Nickel based alloys, Oxide scales, Ash, Boilers, Coal, Corrosion resistance, Aluminum alloys, Steam, Titanium alloys, Oxidation
Keywords:
coal ash corrosion, steam oxidation, USC boiler, super-heater, re-heater, Ni base alloy, Fe-Ni base alloy
© 2009 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).
2009
Association for Materials Protection and Performance (AMPP)
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