Towards better understanding of temperature gradients in superheater corrosion

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    Sammanfattning

    This paper presents a novel laboratory method for superheater corrosion experiments in which a temperature gradient is applied over the deposit and steel. Experiments using salt mixtures of NaCl/Na2SO4 or KCl/K2SO4 show alkali chloride transport (NaCl, KCl) within the salt layer, and to the steel surface. The alkali chloride is vaporized from the salt grains, transported down the temperature gradient, and deposited on surfaces with lower temperature. Mathematical model predictions show the governing transport process to be temperature gradient induced concentration diffusion, not thermal diffusion. The transport rate is species-dependent, with a greater transport rate of KCl as compared to NaCl. Further work is needed for a better understanding of the implications of temperature gradients for superheater corrosion in boiler environments.

    OriginalspråkEngelska
    Sidor251-256
    Antal sidor6
    StatusPublicerad - 2014
    MoE-publikationstypO2 Other
    Evenemang11th International Conference on Fluidized Bed Technology, CFB 2014 - Beijing, Kina
    Varaktighet: 14 maj 201417 maj 2014

    Konferens

    Konferens11th International Conference on Fluidized Bed Technology, CFB 2014
    LandKina
    OrtBeijing
    Period14/05/1417/05/14

    Nyckelord

    • Deposit temperature gradient, high-temperature corrosion

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