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Radiation heat transfer in circulating fluidized bed combustors
Umeå University, Faculty of Science and Technology, Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Applied Physics and Electronics.
2005 (English)In: International Journal of Thermal Sciences, Vol. 44, 399-409 p.Article in journal (Refereed) Published
Abstract [en]

A new model for predicting radiation heat transfer in circulating fluidized bed combustors is proposed. The model assumes two phase structure, the flow at the wall dominated by streamers of clusters traveling mostly downward, interspersed with periods where there is upwards flow of a dilute suspension. Also, the model assumes the intensity distribution to be semi-isotropic in the forward and backward direction. The predictions are in good agreement with the experimental results from the literature. Finally, a parametric study is performed to show the effect of different bed parameters on radiative heat transfer. The results indicate that suspension temperature, wall temperature, wall emissivity, particle emissivity, and suspension density have significant influence on the radiation heat transfer coefficient.

Place, publisher, year, edition, pages
2005. Vol. 44, 399-409 p.
Keyword [en]
Fluidization; Heat transfer; Radiation; Circulating fluidized bed; Combustion; Modeling
Identifiers
URN: urn:nbn:se:umu:diva-19777OAI: oai:DiVA.org:umu-19777DiVA: diva2:207367
Available from: 2009-03-11 Created: 2009-03-11

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CiteExportLink to record
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