Laboratory studies were carried out to assess the effect of operating and raw materials variations on the corrosion of carbon and stainless steels used in syngas coolers of combined cycle coal gasification plants. As expected, sulfidation was found to be the main corrosion mechanism. Corrosion rates of austenitic stainless steels were found to be low up to 500°C. The corrosion rate of carbon and low alloy steels was dependent on operating conditions: thermal cycling changed the corrosion kinetics from parabolic to linear, and increased the rate significantly. H2S partial pressure, total systems pressure and chlorine additions up to 600 ppm did not affect the corrosion rate significantly. Cyclic exposure to moist conditions significantly increased the corrosion rate of carbon and low alloy steels and caused pitting in stainless steels. Examination of materials exposed in a pilot plant indicated that corrosion during shutdowns was a major contributor to the total corrosion rate observed.

Subject
Acids, Pits, Corrosion rate, Gasifiers, Partial pressures, Gasification, Corrosion scales, Syngas, Cooling systems, Pitting, Coal, Stainless steel, Low alloy steel
© 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.