Imperforate bowl: centrifugal separators – Rotatable bowl – Including driven material-moving means therein
Patent
1995-06-06
1997-07-01
Cooley, Charles E.
Imperforate bowl: centrifugal separators
Rotatable bowl
Including driven material-moving means therein
494 56, B04B 120, B04B 1100
Patent
active
056431694
ABSTRACT:
A decanter centrifuge comprises a bowl and a worm or screw type conveyor. The bowl is rotatable about a longitudinal axis and has a cake discharge opening at one end and a liquid phase discharge opening. The conveyor includes a conveyor hub having at least a portion 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 further includes a helical screw or worm attached to the conveyor hub and disposed inside the bowl for scrolling a cake layer along an inner surface of the bowl towards the cake discharge opening. An adjustable component on the hub forms a gap between the hub and the inner surface of the bowl so that the gap has a size adjustable independently of hub rotation speed. The adjustable gap enables an optimization of the moisture content of cake exiting the bowl at the cake discharge opening for a given solids throughput and cake rheology. The adjustable component on the hub takes the form of an annular weir or a baffle plate.
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"Flow Control Structure in a Decanter Centrifuge" Research Disclosure, No. 347, Mar. 1993, pp. 191-192.
Leung Woon-Fong
Shapiro Ascher H.
Yarnell Robert S.
Baker Hughes Incorporated
Cooley Charles E.
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