Fluidized bed with blowdown mixers

Details Fluidized bed with blowdown mixers Fluidized bed with blowdown mixers

B - Operations, Transporting

01

F

259/39

B01F 13/02 (2006.01)

Patent

CA 1114363

ABSTRACT OF THE DISCLOSURE A mixture of powders, preferably uo2powders, is blended to complete homogeneity in a nuclear-safe, bubbling-bed fluidized bed blender. The blender includes a generally ver- tically oriented, slab-shaped, nuclear-safe mixing vessel having a fluidizing grid disposed on the bottom of the vessel. The fluidizing grid comprises a linear array of generally down- wardly-directed pyramidal-shaped hoppers each having walls converging into a conically-shaped closable opening. A plur- ality of gas orifices is provided for directing a flow of fluidizing gas downwardly into the bottom of each of the hoppers and fluidizing gas is supplied to the orifices at a velocity sufficient to cause bubbles of fluidizing gas to rise through and emerge from the mixture of uo2 powders until a homogenous blend of solid uo2 powders is achieved. The apparatus eliminates dead-zones normally present near the bottom of prior art fluidized bed blenders. A method is also disclosed of blending a mixture of powders which in a preferred application is a mixture of uo2 powders.

309639

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