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A dimensionless study of the evaporation and drying stages in spray pyrolysis

Reuge, Nicolas and Caussat, Brigitte A dimensionless study of the evaporation and drying stages in spray pyrolysis. (2007) Computers & Chemical Engineering, vol. 3 (n° 9). pp. 1088-1099. ISSN 0098-1354

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Official URL: http://dx.doi.org/10.1016/j.compchemeng.2006.09.011

Abstract

An original dimensionless study of the pure evaporation and precipitation stages of a spray pyrolysis process has been performed. An estimation of the evaporation time is proposed and the influence of the main processing parameters has been investigated. For operating conditions corresponding to industrial requirements, the main limiting step of the evaporation stage is thermal transfer from the column walls to the gas, not mass or thermal transfer at the droplet surface. Therefore, gas and liquid temperatures remain equal and constitutive equations can be greatly simplified. Moreover, in these conditions, neither solute concentration nor temperature gradients exist inside micronic droplets. Some data from the literature have been modelled and show the large range of validity of the equations and explanations proposed. Finally, with the assumptions made here, the dimensionless study of the precipitation stage shows that the presence of a crust can increase the drying time four-fold. However, a filled particle can still be formed.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Computers & Chemical Engineering website : http://www.sciencedirect.com/science/journal/00981354
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Génie des Interfaces & Milieux Divisés (GIMD) - CVD
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Deposited By: Hélène Dubernard

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