Using of Pourbaix diagram for evaluation of water chemistry recommended for ultra-supercritical parameter of water coolant

An important indicator the reliable operation of the steam-water cycle at power plants is water chemistry. Special chemicals are used to correct water chemistry. At designing a new unit the selection of the chemicals is determined by the parameters of the water and steam and materials, used in diffe...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-11, Vol.891 (1), p.12262
Main Authors: Petrova, T I, Selivanov, E A
Format: Article
Language:English
Subjects:
Ammonia
Austenitic stainless steels
Chromium
Coolants
Hydrologic cycle
Nickel base alloys
Oxidation
Parameters
Physics
Pourbaix diagrams
Power plants
Reagents
Steam electric power generation
Superalloys
Water chemistry
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Summary:An important indicator the reliable operation of the steam-water cycle at power plants is water chemistry. Special chemicals are used to correct water chemistry. At designing a new unit the selection of the chemicals is determined by the parameters of the water and steam and materials, used in different parts of the cycle. Oxygen and ammonia are used to correct water chemistry at units with supercritical parameters In the presence of these reagents the protective film is formed on the surface of the metal. The transition to ultra-supercritical parameters requires the using of new materials, used in the water-steam cycle. Austenitic steels are recommended to replace on inconel steels. Oxygenated treatment and all-volatile treatment under oxidizing conditions were recommended to apply at units of ultra-supercritical parameters. However to select the optimum water chemistry is necessary to have date on the conditions of formation the protective film on the inconel surfaces. On the basis of Pourbaix diagram is proposed to evaluate the influence of water chemistry on the forms of existence the oxides of nickel and chromium on the surface of inconel at high parameters of water coolant. The results of calculations are compared with the experimental data.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/891/1/012262