Supercritical water oxidation and creep behaviour of boiler tube materials

Satu Tuurna, Sanni Yli-Olli, Rami Pohja, Sami Penttilä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    High efficiency in power generation is not only desirable because of economical reasons but also for enhanced environmental performance meaning reduced quantity of forming ash and emissions. In modern medium to large size plants, improvements require supercritical steam values. Furthermore, in future there will be an increasing share of renewables, such as wind and solar power, which will enhance the fluctuation of supply with the consequence that other power sources will have to compensate by operating in a more demanding cyclic or ramping mode. The next generation plant will need to operate at higher temperatures and pressure cycles coupled with demanding hot corrosion and oxidation environments. Such an operation will significantly influence the performance of materials used for boilers and heat exchanger components by accelerating oxidation rates and lowering mechanical properties like creep resistance. The paper discusses the oxidation behaviour of San25, 800H and alloy 263 in supercritical water at temperatures 650 and 700 °C at 250 bar, and compares the changes of mechanical properties of materials at these temperatures.
    Original languageEnglish
    Title of host publicationProceedings of 8th International Conference on Advances in Materials Technology for Fossil Power Plants
    PublisherASM International
    Pages924-930
    ISBN (Print)978-162708131-3, 1627081313
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    Event8th International Conference on Advances in Materials Technology for Fossil Power Plants - Algarve, Portugal
    Duration: 10 Oct 201614 Oct 2016

    Conference

    Conference8th International Conference on Advances in Materials Technology for Fossil Power Plants
    CountryPortugal
    CityAlgarve
    Period10/10/1614/10/16

    Keywords

    • steam oxidation
    • creep performance
    • boiler tube material

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