A priori modelling of an adiabatic spouted bed catalytic reactor

On a mis au point un modele de reacteur a priori pour un reacteur a lit jaillissant adiabatique. Ce modele utilise les equilibres de matiere et d'energie obeissant aux premiers principes pour predire les profils de concentration et de temperature dans la region du jet, de l'espace annulaire et de la fontaine. Les profils de circulation des particules et de porosite dans le jet sont calcules au moyen de techniques analytiques mises au point anterieurement. Les modeles de circulation des particules dans l'espace annulaire sont determines par une analyse des longueurs de trajet minimales. On a pu demontrer que le jet et la fontaine contribuaient de maniere significative a la conversion globale dans le lit. Les conversions predites et experimentales a des debits allant jusqu'a 1,2U ms montrent que la prolongation de la zone de reaction de la fontaine et l'augmentation de la circulation des particules avec l'augmentation de l'ecoulement a l'entree compensent la porosite moyenne plus elevee dans le jet et la fontaine. Les donnees experimentales confirment les resultats calcules pour un lit a jaillissement stable avec oxydation de CO sur un catalyseur Co 3 O 4 /α-Al 2 O 3 . Les effets du debit et de la concentration en reactif a l'entree sont confirmes

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