Ali, M, Mahmud, T, Heggs, PJ et al. (1 more author) (2020) Zonal modelling of a counter-current spray drying tower. Chemical Engineering Research and Design, 155. pp. 180-199. ISSN 0263-8762
Abstract
A generic multi-zonal modelling methodology for spray drying towers is proposed to provide relatively quick (seconds) simulations on desktop computers for decision making on changing process parameters for automatic process control. A multi-zonal model comprises combinations of all or some of six differing zones: plug-flow, semi-plug-flow and well-mixed zones in either co- or counter-current flow. This approach is demonstrated by predicting the dried powder characteristics of a detergent powder from a pilot-scale counter-current spray drying tower. The types, sizes and locations of the different zones are obtained by a detailed analysis of predictions from a previous 3-dimensional Computational Fluid Dynamics (CFD) simulation of gas and particle flow dynamics and drying kinetics within the tower. The multi-zonal model consists of seven zones – five in counter-current and two in co-current flow. The trends of the predicted gas temperature profiles are close to those from the CFD results. The particle exit temperature, moisture content and residence times over the full particle size distribution (PSD) range are very close to the CFD values unlike the previous simulated results from our plug-flow model. The outcome clearly demonstrates that the prerequisite to have a sound conceptual model of spray drying towers, such as the multi-zonal model developed here, is a detailed knowledge of the gas and particle flow fields within the tower.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. This is an author produced version of an article published in Chemical Engineering Research and Design. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Spray drying; Counter-current spray tower; Zonal modelling; Heat and mass transfer |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 06 Feb 2020 13:01 |
Last Modified: | 11 Jan 2021 01:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.cherd.2019.12.018 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:156555 |
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