TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION

Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinen

Abstrakti

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.
AlkuperäiskieliEi tiedossa
Otsikko11th International Conference on Fluidized Bed Technology, CFB-11
ToimittajatLi Jinghai, Fei Wei, Xiaojun Bao, Wei Wang
KustantajaInstitute of Process Engineering, Chinese Academy of Sciences
Sivut
TilaJulkaistu - 2014
OKM-julkaisutyyppiB3 Ei-soviteltu artikkeli konferenssin julkaisusarjassa
Tapahtumaconference; 2014-05-14; 2014-05-17 - Beijing, China
Kesto: 14 toukokuuta 201417 toukokuuta 2014

Konferenssi

Konferenssiconference; 2014-05-14; 2014-05-17
Ajanjakso14/05/1417/05/14

Keywords

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

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