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.
OriginalspråkOdefinierat/okänt
Titel på gästpublikation11th International Conference on Fluidized Bed Technology, CFB-11
RedaktörerLi Jinghai, Fei Wei, Xiaojun Bao, Wei Wang
FörlagInstitute of Process Engineering, Chinese Academy of Sciences
Sidor
StatusPublicerad - 2014
MoE-publikationstypB3 Ej refererad artikel i konferenshandlingar
Evenemangconference; 2014-05-14; 2014-05-17 - Beijing, China
Varaktighet: 14 maj 201417 maj 2014

Konferens

Konferensconference; 2014-05-14; 2014-05-17
Period14/05/1417/05/14

Nyckelord

  • Alkali chloride induced corrosion
  • corrosion
  • high-temperature corrosion
  • lab-scale corrosion measurements

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