A physical description of solids transport in flighted rotary dryers

Britton, P.F., Sheehan, M.E., and Schneider, P.A. (2006) A physical description of solids transport in flighted rotary dryers. Powder Technology, 165 (3). pp. 153-160.

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Abstract

In this paper, a solids transport model for flighted rotary dryers is presented. Emphasis is placed on combining statistical and mechanistic modelling efforts to create a physically motivated compartment model involving pairs of perfectly mixed tank reactors linked in a series arrangement. Here, each tank pair, or cell, aims to physically describe a finite slice of a case study industrial rotary sugar dryer, and is hence governed primarily by flight geometry and dryer operational variables such as rotational speed and dryer inclination. Solids flow paths are structured to properly represent the different modes of transport in the rotary dryer, and values of transport coefficients are based on calculated rates of rotational and axial flows. A solids dispersion variable is used to correlate the model residence time distribution (RTD) prediction with available data from a tracer study conducted during industrial operation of a full-scale raw sugar dryer. RTD results from the model show intuitive responses to variations in solids feed rate, rotational speed and drum inclination.

Item ID: 3929
Item Type: Article (Refereed Research - C1)
Keywords: drying; psuedo-physical; residence time; flighted rotary dryer; mechanistic; compartment model; solids transport; physical; modelling
ISSN: 1873-328X
Date Deposited: 18 Nov 2009 00:32
FoR Codes: 09 ENGINEERING > 0904 Chemical Engineering > 090403 Chemical Engineering Design @ 50%
09 ENGINEERING > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified @ 50%
SEO Codes: 86 MANUFACTURING > 8614 Machinery and Equipment > 861403 Industrial Machinery and Equipment @ 70%
85 ENERGY > 8507 Energy Conservation and Efficiency > 850703 Industrial Energy Conservation and Efficiency @ 30%
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