Decanter centrifuge for producing cake with reduced moisture con

Details Decanter centrifuge for producing cake with reduced moisture con Decanter centrifuge for producing cake with reduced moisture con

1997-06-13

1998-11-24

Cooley, Charles E.

Imperforate bowl: centrifugal separators

Rotatable bowl

Including driven material-moving means therein

494 56, B04B 120, B04B 1100

Patent

active

058400079

ABSTRACT:
A decanter centrifuge comprises a bowl rotatable about a longitudinal axis, the bowl being provided with a cake discharge opening at one end and a liquid phase discharge opening. The bowl has a cylindrical portion and a beach portion disposed between the cylindrical portion and the cake discharge opening. A beach area is provided on an inner surface of the bowl at the beach portion of the bowl, the beach area including a first section and a second section with the second section located between the first section and the cake discharge opening. The second section of the beach area has a less steep or smaller slope than the first section. A conveyor is at least partially disposed inside the bowl for rotation about the longitudinal axis at an angular speed different from an angular rotational speed of the bowl. The conveyor includes a helical screw disposed inside the bowl for scrolling a deposited solids cake layer along the inner surface of the bowl towards the cake discharge opening. A feed element extends into the bowl and the conveyor for delivering a feed slurry into a pool inside the bowl. A flow control structure is provided in the bowl proximate to the second section of the beach area for impeding a flow of cake along the bowl towards the cake discharge opening.

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"Flow Control Structure in a Decanter Centrifuge," Research Disclosure, No. 347, Mar. 1993, pp. 191-192.
Patent Abstracts of Japan, (European Patent Office), Publication No. 58 043 253, Publication Date: Dec. 3, 1983; Applicant: Mitsui Toatsu Chem Inc.

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