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A general framework for pellet reactor modeling : application to p-recovery

Montastruc, Ludovic and Azzaro-Pantel, Catherine and Biscans, Béatrice and Cabassud, Michel and Domenech, Serge A general framework for pellet reactor modeling : application to p-recovery. (2003) In: 9th Congress of the French Society of Chemical Engineering , 9-11 Sep 2003, Saint Nazaire, France .

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Official URL: http://dx.doi.org//10.1205/026387603770866498

Abstract

Emphasis in recent years has been focused on improving processes which lead to enhanced phosphate recovery. This paper studies the precipitation features of calcium phosphate in a fluidized bed reactor in a concentration range between 4 et 50mg/L and establishes the conditions for optimum phosphate removal efficiency. For this purpose, two models are coupled for predicting the pellet reactor efficiency. First, a thermodynamical model is used for predicting calcium phosphate precipitation vs. initial conditions (pH, [P], [Ca], T..). The second one is a reactor network model. Its parameters are identified by an optimization procedure based on Simulated Annealing (SA) and Quadratic Programming (QP). The efficiency is computed by coupling a simple agglomeration model with a combination of elementary systems representing basic ideal flow patterns (perfect mixed flow, plug flow,…). More precisely, the superstructure represents the hydrodynamical conditions in the fluidized bed. The observed results show that a simple combination of ideal flow patterns is involved in pellet reactor modeling, which seems interesting for a future control. The experimental prototype used for validation purpose is first described. Then, the thermochemical model is presented for calcium phosphate precipitation. The third part is devoted to the reactor network-oriented model. The approach presented is finally validated with experimental runs.

Item Type:Conference or Workshop Item (Paper)
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 Biochemical Engineering Journal website : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B8JGF-4RV2MKR-15&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=e5b54a51d160fdd25db16296046c48c9
Audience (conference):National conference proceedings
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) - Procédés Systèmes Industriels (PSI) - Conception Optimisation Ordonnancement des Procédés (COOP)
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Génie des Interfaces & Milieux Divisés (GIMD)
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Réaction, mélange & séparation (RMS)
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Deposited By: Ludovic MONTASTRUC

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