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Modelling of thermal behaviour of iron oxide layers on boiler tubes

Angelo, J. D., Bennecer, A., Kaczmarczyk, S. and Picton, P. (2016) Modelling of thermal behaviour of iron oxide layers on boiler tubes. Journal of Physics: Conference Series. 721, pp. 1-8. 1742-6588.

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Angelo_D_J_JPCS_2016_Modelling_of_thermal_behaviour_of_iron_oxide_layers_on_boiler_tubes
Angelo_D_J_JPCS_2016_Modelling_of_thermal_behaviour_of_iron_oxide_layers_on_boiler_tubes.pdf - Published Version
Information
Abstract:
Slender boiler tubes are subject to localised swelling when they are expose to excessive heat. The latter is due to the formation of an oxide layer, which acts as an insulation barrier. This excessive heat can lead to microstructural changes in the material that would reduce the mechanical strength and would eventually lead to critical and catastrophic failure. Detecting such creep damage remains a formidable challenge for boiler operators. It involves a costly process of shutting down the plant, performing electromagnetic and ultrasonic non-destructive inspection, repairing or replacing damaged tubes and finally restarting the plant to resume its service. This research explores through a model developed using a finite element computer simulation platform the thermal behaviour of slender tubes under constant temperature exceeding 723 \K. Our simulation results demonstrate that hematite layers up to 15 \μm thickness inside the tubes do not act as insulation. They clearly show the process of long term overheating on the outside of boiler tubes which in turn leads to initiation of flaws.
Uncontrolled Keywords:
Thermal behaviour, iron oxide, boiler tubes
Creators:
Angelo, J. D., Bennecer, A., Kaczmarczyk, S. and Picton, P.
Faculties, Divisions and Institutes:
Faculties > Faculty of Arts, Science & Technology > Engineering
Date:
1 May 2016
Date Type:
Publication
Page Range:
pp. 1-8
Journal or Publication Title:
Journal of Physics: Conference Series
Volume:
721
Number of Pages:
8
Language:
English
DOI:
10.1088/1742-6596/721/1/012002
ISSN:
1742-6588
Status:
Published / Disseminated
Refereed:
Yes
Related URLs:
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