Towards better understanding of temperature gradients in superheater corrosion

    Research output: Contribution to conferencePaper (not published)peer-review

    1 Citation (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages251-256
    Number of pages6
    Publication statusPublished - 2014
    MoE publication typeO2 Other
    Event11th International Conference on Fluidized Bed Technology, CFB 2014 - Beijing, China
    Duration: 14 May 201417 May 2014

    Conference

    Conference11th International Conference on Fluidized Bed Technology, CFB 2014
    CountryChina
    CityBeijing
    Period14/05/1417/05/14

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