The in situ monitoring of the chemistry and electrochemistry of aqueous heat transport fluids in thermal (nuclear and fossil) power plants is now considered essential if adequate assessment and close control of corrosion and mass transfer phenomena are to be achieved. Because of the elevated temperatures and pressures involved, new sensor technologies are required that are able to measure key parameters under plant operating conditions for extended periods of time. In this paper, we outline a research and development program that is designed to develop practical sensors for use in thermal power plants. Our current emphasis is on sensors for measuring corrosion potential. pH. the concentrations of oxygen and hydrogen, and the electrochemical noise generated by corrosion processes at temperatures ranging from ~250°C to 500°C. The program is currently at the laboratory stage, but testing of prototype sensors in a coal-fired supercritical power plant in Spain will begin shortly.

Subject
Water, Sensors, Electrochemical noise, Zirconium, Reference electrodes, Liquids, Power plants, Oxygen, Steam, Electrodes, Electrode potential, Hydrogen, High temperature
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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