TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION

Research output: Chapter in Book/Conference proceedingConference contributionScientific

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 languageUndefined/Unknown
Title of host publication11th International Conference on Fluidized Bed Technology, CFB-11
EditorsLi Jinghai, Fei Wei, Xiaojun Bao, Wei Wang
PublisherInstitute of Process Engineering, Chinese Academy of Sciences
Pages
Publication statusPublished - 2014
MoE publication typeB3 Non-refereed article in conference proceedings
Eventconference; 2014-05-14; 2014-05-17 - Beijing, China
Duration: 14 May 201417 May 2014

Conference

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

Keywords

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

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