Coating apparatus having opposed atomizing nozzles in a...

B - Operations – Transporting – 05 – C

Patent

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Details

B05C 19/02 (2006.01) A61J 3/00 (2006.01) B01J 2/00 (2006.01) B01J 2/16 (2006.01)

Patent

CA 2096924

A fluid-bed particle coater having a dual-jet and spray arrangement and including an upstanding column which has an upper cylindrical section, a tapered intermediate section and lower cylindrical section. Depending from the lower cylindrical section is a cylindrical chamber which is inner-connected to tubular sections adapted for introducing multiple air streams via separately controlled inlet openings. The dual-jet and spray construction includes an upwardly-facing spray nozzle positioned in coaxial relationship to the tubular sections and a draft tube, and a downwardly-facing spray nozzle contained with a fountain tube which is disposed above the draft tube. The fountain and draft tubes concentrically intersect about the intermediate section of the column in an opened telescopic arrangement. The dual-jet and spray particle coater provides multiple coating and drying zones and is conveniently adapted with a completely integrated computer control system that provides for automatic and continuous monitoring and control of all fluid flowrates, temperatures and critical pressure measurements throughout the fluidized coating system.

Installation de revêtement particulaire en lit fluidisé à double jet de pulvérisation et colonne verticale comportant des sections supérieure et inférieure de forme cylindrique séparées par une section intermédiaire de forme conique. Une chambre cylindrique associée à la section inférieure est raccordée à des sections tubulaires qui servent à acheminer des flux d'air à débits multiples à travers des orifices d'admission à commande individuelle. La construction à double jet comporte une buse de pulvérisation orientée vers le haut disposée en coaxialité avec les sections tubulaires et un tube d'aspiration; une buse de pulvérisation orientée vers le bas est disposée à l'intérieur d'un tube de type fontaine qui est placé au-dessus du tube d'aspiration. Le tube de type fontaine et le tube d'aspiration se croisent concentriquement dans la région de la section intermédiaire de la colonne, dans une configuration télescopique ouverte. L'installation de revêtement particulaire en lit fluidisé comporte plusieurs zones de revêtement et de séchage et son fonctionnement est placé sous le contrôle d'un système de commande entièrement intégré qui assure la surveillance et la régulation automatique du débit, de la température et de la pression des fluides utilisés dans l'installation de revêtement particulaire en lit fluidisé.

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