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Effect of staged air on heat transfer in circulating fluidized beds
Department of Mechanical Engineering, Hacettepe University, Beytepe, 06800 Ankara, Turkey.
Umeå University, Faculty of Science and Technology, Applied Physics and Electronics.
Mechanical and Aerospace Engineering Department, Carleton University Ottawa, ON, Canada K1S 5B6.
2008 (English)In: Applied Thermal Engineering, Vol. 28, 1008-1014 p.Article in journal (Refereed) Published
Abstract [en]

The purpose of this work is to develop a model for bed-to-surface heat transfer in circulating fluidized bed (CFB) risers with secondary air (SA) injection. The heat transfer coefficient is correlated to cross-sectionally averaged solids hold-up. The average solids hold-up is correlated with the operating and design parameters of CFB risers with SA injection. The data used in developing the correlations cover a range of 2.0–8.6 m/s for superficial gas velocity, 5–100 kg/m2s for solids circulation rate, 0–0.6 for secondary to primary air ratio, and 60–300 lm for particle diameter (groups A and B). The predictions obtained with the correlations show good agreement with the experimental data. Furthermore, an experimental correlation, developed in our previous work for prediction of wall-to-bed heat transfer coefficient was used in a parametric study to investigate the effects of design and operating parameters on heat transfer.

Place, publisher, year, edition, pages
2008. Vol. 28, 1008-1014 p.
Keyword [en]
Circulating fluidized bed; Secondary air injection; Solids hold-up; Heat transfer
Identifiers
URN: urn:nbn:se:umu:diva-19781OAI: oai:DiVA.org:umu-19781DiVA: diva2:207371
Available from: 2009-03-11 Created: 2009-03-11

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