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Method and apparatus for adding and mixing second cohesive powders in a fluidized bed blender
| Details |
Inventors: Larson, Richard I.; Brassfield, Henry C.; Adomitis, John T.;
Assignee: General Electric Company (San Jose, CA)
Primary Examiner: Rosenbaum; Mark
Assistant Examiner:
Attorney, Agent or Firm: James, Jr.; Ivor J., Turner; Samuel E., Simkins; Raymond G.
A method and apparatus for the introduction of second cohesive powders into an improved fluidized bed blender containing UO.sub.2 powder, and for blending such second cohesive powders with the UO.sub.2 powder in the fluidized bed blender. The apparatus comprises an eductor, an improved pressurized vortec mill, a pneumatic conveying system that operates in turbulent flow, and an improved fluidized bed blender. The method and apparatus provide for injection and uniform dispersion of a second cohesive powdered ingredient or ingredients having hydrophobic, hydrophilic or hygroscopic properties in the fluid bed blender adjacent the bottom of the fluidized bed therein during the blending operation, thereby minimizing entrainment of the second powder mixture and providing a homogeneous blend of powders. |
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DETAILED DESCRIPTION OF THE COMPONENTS Referring now to FIG.
3, one of the plurality of hoppers contained within the fluid bed blender is shown in relation to the impingement device 20 positioned within the blending chamber.
The fluidized bed blender, utilized according to the present invention, is of a type generally known in the art and comprises a vertically-oriented, mixing vessel 13 having a fluidizing grid 14 disposed at the bottom of the vessel 10.
The fluidizing grid 14 comprises a linear array of generally downwardly-directed pyramidally-shaped hoppers 15, each having walls converging into conically-shaped openings.
A plurality of valves 17 are employed for discharging blended powders, such as UO.
sub.
2 powders and a second powdered mixture, from the hoppers, one such valve 17 being disposed at the bottom of each hopper.
A set of orifices 16 is incorporated at the base of each hopper, and the set of orifices is connected to a gas inlet 18 for a source of fluidizing gas by means of a manifold and connecting lines.
A general discussion of the design considerations involved in designing a prior art bubbling-bed fluidized bed blender including a consideration of particle properties, particle size, particle distribution, vessel geometry, superficial gas velocity, and circulation patterns is found in Fluidization and Particle Fluid Systems, by Frederick A.
Zenz and Donald F.
Othmer, Reinhold Chemical Engineering Series, Reinhold Publishing Corporation, New York, 1960.
The fluidizing bed blender of the present invention is distinguishable over prior art fluidized bed blenders by the incorporation of at least one impingement device 20 adjacent the fluidizing grid as shown in FIGS.
2 and 3.
While only a single impingement device is shown, it should be recognized that a series of impingement devices can be utilized in the practice of this invention.
The impingement device as shown in FIGS.
3 and 5 is of a cage-like construction having an inlet conduit 24, a circular deflection plate 21, an upper circular plate 22, and supporting members or struts 23 joining the upper and lower plates of the impingement device in vertically spaced relation
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Liquid Purification 
