Modélisation du fonctionnement d'un précipitateur à effet vortex

Abstract : In the chemical engineering field applied to spent nuclear fuel reprocessing, some precipitation reaction are performed in so-called « vortex precipator » device (un-bafffied stirred tank). A study of its hydrodynamic behavior has allowed the characterization of the forced vortex axial zone limited in the core of the tank. Several hydrodynamic models of increasing complexity have been proposed built from standard reactors network in association with correlations to represent the specificity of the internai mixing. ln this way and regarding ail kinetics data involved in precipitation, three mixing scales has to be considered : the residence time (about ten minutes), the vortex mixing time (about ten secondes) and the supplies micromixing time (few seconds). Some experimentations of calcium oxalate precipitations performed in vortex device and baffled analog tank has completed the demonstration, as predicted by modelling, of the specificities of solids obtained
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http://docnum.univ-lorraine.fr/prive/INPL_T_1994_EYSSERIC_EMILE_C.pdf
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Submitted on : Thursday, March 29, 2018 - 1:26:09 PM
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Catherine Eysseric-Emile. Modélisation du fonctionnement d'un précipitateur à effet vortex. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 1994. Français. ⟨NNT : 1994INPL115N⟩. ⟨tel-01751768⟩

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