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Vertical plug-flow pneumatic conveying from a fluidised bed

Watson, RJ, Thorpe, Rex and Davidson, JF (2012) Vertical plug-flow pneumatic conveying from a fluidised bed Powder Technology, 224. pp. 155-161.

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Experiments are described on the pneumatic conveying of 2.7mm alumina particles up a vertical riser of internal diameter 46.4mm or 71.4mm. The particles entered the riser from a fluidised bed, via a short horizontal pipe and a bend of radius 75mm. Measured variables included solids flow rates, air flow rates, inlet and outlet air pressures P 1 and P 2, and the pressure profile in the riser. The solids flow rate was consistent with some earlier models of similar systems, in which the plugs of packed solids move up at a velocity of about U-U mf, where U=superficial air velocity and U mf=incipient fluidising velocity. Solids-wall friction is significant and suppresses fluidisation. To model the system approximately, a conveying efficiency=(power for air compression)/(rate of gain of potential energy of solids) is defined and correlated against solids flux. It was found that the conveying efficiency tended to an asymptote just above 20%. The correlation led to a tentative design formula, Eq. (6), for predicting P 1-P 2 at a given solids flow rate. P 1-P 2 is typically between 50% and 100% of the pressure drop needed to support a column of solids of height equal to that of the riser.It was concluded that plug flow pneumatic conveying is a satisfactory technology for transporting coarse particles which cannot be conveyed in leaner regimes due to the possibility of pipeline erosion or solids attrition. © 2012 Elsevier B.V.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Watson, RJ
Davidson, JF
Date : 1 July 2012
DOI : 10.1016/j.powtec.2012.02.045
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:25
Last Modified : 24 Jan 2020 22:13

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