Dry powder dispersion system

B - Operations – Transporting – 01 – F

Patent

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Details

B01F 3/06 (2006.01) B01F 5/00 (2006.01) B01F 5/04 (2006.01) G01N 15/02 (2006.01) B01F 13/10 (2006.01)

Patent

CA 2184372

A powder dispersion system (10), including a powder disperser (11) and a control unit (13). A powder disperser (11) includes a shear dispersion assembly (16) and may include a fluidization assembly (14). Particles are accelerated from an impact surface (42) located within an acceleration chamber (40) through an annular nozzle (44). A feedback loop controls the shear force applied to the gas within the annular nozzle (44). The fluidization assembly (14) includes a primary chamber (22) and a secondary chamber (30). A pulsed gas jet (26) directed into the primary chamber (22) disperses particles of a powder sample (24) into the secondary chamber (30). Particles are transported from the secondary chamber (30) to the dispersion assembly (16) through a momentum tube (18).

Système de dispersion de poudre (10) comportant un disperseur de poudre (11) et un boîtier de commande (13). Le disperseur de poudre (11) comprend un ensemble de dispersion par cisaillement (16) et, éventuellement, un ensemble de fluidisation (14). Les particules sont accélérées à partir d'une surface de choc (42) située dans une chambre d'accélération (40), dans une buse annulaire (44). Une boucle de rétroaction permet de doser la force de cisaillement appliquée au gaz dans la buse annulaire (44). L'ensemble de fluidisation (14) comprend une chambre primaire (22) et une chambre secondaire (30). Un jet de gaz pulsé (26) dirigé dans la chambre primaire (22) assure la dispersion des particules d'un échantillon de poudre (24) en direction de la chambre secondaire (30). Les particules sont transportées de la chambre secondaire (30) à l'ensemble de dispersion (16) par une conduite à inertie (18).

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