Improvements in and relating to fluid bed expansion and...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/00 (2006.01) B01J 8/18 (2006.01) B01J 8/20 (2006.01) B01J 8/24 (2006.01) C02F 3/12 (2006.01) C02F 3/30 (2006.01) C02F 3/34 (2006.01)

Patent

CA 2500843

Method and apparatus (8) in which a biomass is carried on a substrate which is fluidised. The fluidised substrate has below it a lazer of distributor particles through which the fluidising medium passes prior to contact with the fluidised substrate and biomass associated therewith. The effect of the distributor layer is that the particles damp out excessive turbulence in the fluidising medium thus preventing undue turbulence of the medium within the fluidised layer. This has the advantage of controlling, to some extent, the thickness of the biofilm, which maz be carried by the fluidised substrate particles. The particles may be recycles (1, 2, 5) through the distributor layer where the action of the distributor particles serve to strip exces biofilm from the substrate particles which latter are then returned to the fluidised bed.

La présente invention concerne un procédé et un appareil (8) dans lequel une biomasse est supportée sur un substrat fluidisé. Au dessous de ce dernier, se trouve une couche de particules du distributeur que traverse le milieu de fluidisation avant d'entrer en contact avec le substrat fluidisé et la biomasse qui lui est associée. La couche du distributeur se caractérise en ce que ses particules amortissent la turbulence excessive dans le milieu de fluidisation, ce qui évite toute turbulence inutile du milieu à l'intérieur de la couche fluidisée. Ce système présente l'avantage de contrôler dans une certaine mesure l'épaisseur du biofilm qui peut être supporté par les particules fluidisées du substrat. Ces particules (1, 2, 5) peuvent être recyclées dans la couche du distributeur où l'action des particules du distributeur permet de supprimer l'excès de film des particules du substrat qui sont ensuite renvoyées dans le lit fluidisé.

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