A Simple Dynamic Model for Solid Transport in Rotary Dryers

Shahhosseini, S, Cameron, IT and Wang, FY (2000) A Simple Dynamic Model for Solid Transport in Rotary Dryers. Drying Technology, 18 4 & 5: 867-886. doi:10.1080/07373930008917742


Author Shahhosseini, S
Cameron, IT
Wang, FY
Title A Simple Dynamic Model for Solid Transport in Rotary Dryers
Journal name Drying Technology   Check publisher's open access policy
ISSN 0737-3937
Publication date 2000-01-01
Sub-type Article (original research)
DOI 10.1080/07373930008917742
Open Access Status
Volume 18
Issue 4 & 5
Start page 867
End page 886
Total pages 20
Editor Arun S. Mujumdar
Place of publication New York
Publisher Marcel Dekker Inc
Language eng
Subject C1
670707 Inorganic industrial chemicals
290600 Chemical Engineering
Abstract The solid particle movement in a rotary drum plays an important role in drying processes. The solid distribution in the drum affects the amount of contact surface between the solid and the gas. The retention time of solids influences the time particles can stay in contact with the gas in order to transfer heat and mass. Any heat and mass transfer model for a solid particle dryer must be able to predict solid flowrate and solid hold-up. There have been several reports in the literature regarding the modelling aspects of solid transport in dryers. If the model is developed for model-based control, it must be simple and yet represent dynamics of the system accurately. This paper addresses solid motion modelling and the effects of different variables involved in solid transport phenomena. Sugar drying process is the case study in this work. A steady state semi-empirical model was modified to predict solid hold-up and flowrate in rotary dryers. This model was incorporated into a heat and mass transfer model to predict solid moisture and temperature for inferential and model-based control purposes. Results of several experiments that have been used to investigate dynamics of the system in terms of solid motion and to validate the model are also presented. The approach advocated in this paper is directly applicable to the transport of other solids in rotary drum equipment and can thus be regarded as a generalized model.
Keyword Engineering, Chemical
Engineering, Mechanical
Modelling
Rotary Drying
Solid Transport
Flighted Rotating Drums
Movement
Design
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Tue, 10 Jun 2008, 21:50:41 EST