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Heat transfer to the riser-wall of a circulating fluidised bed (CFB)

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Brems, Anke, Cáceres, G., Dewil, Raf, Baeyens, Jan and Pitié, F. (2013) Heat transfer to the riser-wall of a circulating fluidised bed (CFB). Energy, Volume 50 . pp. 493-500. doi:10.1016/j.energy.2012.10.037

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Official URL: http://dx.doi.org/10.1016/j.energy.2012.10.037

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Abstract

The circulating fluidized bed is of increasing importance for gas–solid and gas–catalytic reactions, for drying, and recently its use in solar energy capture and storage has been advocated. In all applications, the supply or withdrawal of heat is a major issue, and the heat transfer coefficient from the gas–solid suspension to the heat transfer surface needs to be determined as design parameter. The present paper investigates the heat transfer coefficient for different operating gas velocity and solids circulation flux, whilst covering the different hydrodynamic solid flow regimes of dilute, core–annulus or dense mode. Measured values of the wall-to-bed heat transfer coefficients are compared with empirical predictions of both Molodstof and Muzyka, and Golriz and Grace. The application of a packet renewal mechanism at the wall is also investigated, and introducing the predicted solid contact time at the wall provides a very fair estimate of the heat transfer coefficient.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: Energy
Publisher: Elsevier Ltd
ISSN: 0360-5442
Official Date: 1 February 2013
Dates:
DateEvent
1 February 2013Published
Volume: Volume 50
Page Range: pp. 493-500
DOI: 10.1016/j.energy.2012.10.037
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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