Spraying device and method for fluidised bed granulation

Details Spraying device and method for fluidised bed granulation Spraying device and method for fluidised bed granulation

B - Operations, Transporting

05

B

B05B 7/06 (2006.01) B01J 2/04 (2006.01)

Patent

CA 2549755

The invention concerns a spraying device for melt granulation in fluidised bed comprising a nozzle (2) with a feed channel for a liquid to be atomised, where the liquid is led through emulsifying means and into an internal mixing chamber for gas and liquid, before it is fed to the fluidised bed. The nozzle has a separate channel for the atomising gas fitted concentrically around the central liquid supply channel for the liquid to be atomised or nebulised. The mixing chamber surrounds the outlet zone of the liquid spray from the emulsifying means and the gas, allowing efficient mixing of high speed atomisation gas and liquid, and having an external gas cap (1) where fluidisation gas is channelled into a spout above the spraying device.

L'invention concerne un dispositif de pulvérisation conçu pour effectuer la granulation en fusion dans un lit fluidisé et comprenant un ajutage (2) comportant un passage d'alimentation en liquide à pulvériser, ce liquide étant véhiculé à travers des moyens d'émulsion et introduit dans une chambre de mélange interne de gaz et de liquide, avant d'alimenter le lit fluidisé. Cet ajutage possède un canal séparé pour le gaz d'atomisation entourant de façon concentrique le canal central d'alimentation en liquide à atomiser ou à nébuliser. La chambre de mélange entoure la zone de sortie du liquide pulvérisé depuis les moyens d'émulsion, ainsi que du gaz, ce qui permet d'obtenir un mélange efficace et très rapide du gaz et du liquide de pulvérisation, cette chambre de mélange comprenant une coiffe extérieure (1) dans laquelle le gaz de fluidisation est introduit dans un bec situé au-dessus du dispositif de pulvérisation.

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