Agitating – By injecting gas into mixing chamber – Plural gas feeders
Patent
1977-06-06
1979-10-30
Jenkins, Robert W.
Agitating
By injecting gas into mixing chamber
Plural gas feeders
423261, 423DIG16, B01F 1302
Patent
active
041726677
ABSTRACT:
A mixture of powders, preferably UO.sub.2 powders, is blended to complete homogeneity in a nuclear-safe, bubbling-bed fluidized bed blender. The blender includes a generally vertically-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 downwardly-directed pyramidal-shaped hoppers each having walls converging into a conically-shaped closable opening. A plurality 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 UO.sub.2 powders until a homogeneous blend of solid UO.sub.2 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 UO.sub.2 powders.
REFERENCES:
patent: 2786280 (1957-03-01), Gishler
patent: 3807705 (1974-04-01), Humkey
patent: 3825230 (1974-07-01), Frye
patent: 3881702 (1975-05-01), McIver
Page 56 of Bulletin #123, Utah, Engineering Experiment Station, Sixth Printing, Mar. 1970.
Etheredge Benjamin F.
Zenz Frederick A.
General Electric Company
James, Jr. Ivor J.
Jenkins Robert W.
Laub Sam E.
Turner Samuel E.
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