Solids transport in rotary sugar dryers

Lee, A., Sheehan, M.E., and Schneider, P.A. (2004) Solids transport in rotary sugar dryers. In: Proceedings of the Australian Society of Sugar Cane Technologists - 26th, pp. 1-8. From: 26th Annual Conference Australian Society of Sugar Cane Technologists, 4 - 7 May 2004, Brisbane, QLD, Australia.

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Abstract

Rotary drum sugar drying is the last important unit operation used in the manufacture of raw sugar. In order to improve their design, operation and control, it is helpful to model their dynamic behaviour. One important aspect involves predicting the rate at which solids are conveyed through the dryer, so that hold-up of crystalline material can be better predicted. It is also important to accurately predict the amount of sugar presented to the oncoming air stream in the falling curtain, so that meaningful heat and mass transfer relations can be developed. This paper presents a dynamic model of solids transport through a rotary sugar dryer. The model is developed by assuming a tanks-in-series/parallel arrangement, akin to chemical reaction engineering systems. The use of two tanks connected in parallel allows the separation of sugar undergoing drying from the sugar particles at rest in the flights. This approach allows the prediction of air phase and rolling sugar hold-up, and residence time distribution within the dryer. Correlations to account for overloaded dryers and the impact of airflow are included. The model is based on a tracer study performed on a 100 t/h industrial dryer.

Item ID: 7781
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: compartment model; drying; fluidisation; kilning flow; process modelling; residence time distribution
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ISSN: 0726-0822
Date Deposited: 16 Jun 2010 01:59
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 100%
SEO Codes: 86 MANUFACTURING > 8601 Processed Food Products and Beverages (excl. Dairy Products) > 860199 Processed Food Products and Beverages (excl. Dairy Products) not elsewhere classified @ 100%
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