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 language | Undefined/Unknown |
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Title of host publication | 11th International Conference on Fluidized Bed Technology, CFB-11 |
Editors | Li Jinghai, Fei Wei, Xiaojun Bao, Wei Wang |
Publisher | Institute of Process Engineering, Chinese Academy of Sciences |
Pages | – |
Publication status | Published - 2014 |
MoE publication type | B3 Non-refereed article in conference proceedings |
Event | conference; 2014-05-14; 2014-05-17 - Beijing, China Duration: 14 May 2014 → 17 May 2014 |
Conference
Conference | conference; 2014-05-14; 2014-05-17 |
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Period | 14/05/14 → 17/05/14 |
Keywords
- Alkali chloride induced corrosion
- corrosion
- high-temperature corrosion
- lab-scale corrosion measurements