Effects of superficial gas velocity and bed particle size on bed defluidization during biomass combustion were investigated. Sampled bed particles from four different large-scale circulating- and bubbling fluidized bed combustors, using biomass as fuel, were collected and analyzed. The bed particles from each fluidized bed unit were divided into small and large particle size fractions. The results indicate no significant difference in elemental compositions between small and large coated bed particles but the ratio of coating thickness to the mean particle diameter was higher for the small particles compared to the large ones. Controlled fluidized bed agglomeration tests revealed strong influence from fluidization velocity on initial defluidization temperatures at lower velocities, but little effect at higher velocities. Influence of bed particle size on initial defluidization temperature varied depending on operating conditions. Finally, a model based on viscous flow sintering is proposed for the relation between agglomeration temperature and superficial gas velocity. The model predictions are in good agreement with experimental data.
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18th International Conference on Fluidized Bed Combustion
May 22–25, 2005
Toronto, Ontario, Canada
Conference Sponsors:
- Advanced Energy Systems
ISBN:
0-7918-4183-9
PROCEEDINGS PAPER
Influence of Fluidization Velocity on Bed Defluidization in Fluidized Bed Combustors
Mohammad R. Golriz,
Mohammad R. Golriz
Umea˚ University, Umea˚, Sweden
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Morgan Eriksson,
Morgan Eriksson
Umea˚ University, Umea˚, Sweden
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Marcus O¨hman,
Marcus O¨hman
Umea˚ University, Umea˚, Sweden
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Anders Nordin,
Anders Nordin
Umea˚ University, Umea˚, Sweden
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Rainer Backman
Rainer Backman
Umea˚ University, Umea˚, Sweden
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Mohammad R. Golriz
Umea˚ University, Umea˚, Sweden
Morgan Eriksson
Umea˚ University, Umea˚, Sweden
Marcus O¨hman
Umea˚ University, Umea˚, Sweden
Anders Nordin
Umea˚ University, Umea˚, Sweden
Rainer Backman
Umea˚ University, Umea˚, Sweden
Paper No:
FBC2005-78133, pp. 551-556; 6 pages
Published Online:
October 7, 2008
Citation
Golriz, MR, Eriksson, M, O¨hman, M, Nordin, A, & Backman, R. "Influence of Fluidization Velocity on Bed Defluidization in Fluidized Bed Combustors." Proceedings of the 18th International Conference on Fluidized Bed Combustion. 18th International Conference on Fluidized Bed Combustion. Toronto, Ontario, Canada. May 22–25, 2005. pp. 551-556. ASME. https://doi.org/10.1115/FBC2005-78133
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