Liquid purification or separation – Tangential flow or centrifugal fluid action
Patent
1991-06-14
1993-01-26
Dawson, Robert A.
Liquid purification or separation
Tangential flow or centrifugal fluid action
210781, 494 52, 494 53, B04B 120
Patent
active
051820200
ABSTRACT:
A centrifuge, for example a decanter type centrifuge, comprises a bowl (10) rotatable about a longitudinal rotational axis (Y), an inlet (14) for feeding into the bowl a slurry to be separated, and a helical scroll conveyor (12) rotatably mounted about the rotational axis and adapted to be rotated within the bowl at a different speed from that of the bowl in order to scroll particles adjacent to the bowl wall to a solids discharge end of the bowl. The decanter further comprises a plurality of walls (23) at least partly submerged in the centrate and defining passages therebetween. By providing a plurality of passages, through which the centrate to be clarified can travel, particles (e.g. solids) to be separated from the centrate have a short distance to travel under centrifugal force before entering the boundary layer at the walls of the passages. This enables more of the fine particles in the centrate to be separated out.
REFERENCES:
patent: 2743864 (1956-05-01), Lyons
patent: 4209128 (1980-06-01), Lyons
patent: 4509942 (1985-04-01), Gunnewig
European Patent Office Search Report re Patent Appln. No. 91 305 510.2.
Soviet Inventions Illustrated, Dated Oct. 1966, Section I Chemical Regarding SU-A-179245 (Nikolenko), of Feb. 3, 1966.
Japanese Abstract, vol. 14, No. 17 (C-675) (3960), Jan. 16, 1990, regarding the Separation Plate System Decanter of Japanese Appln. No. 63-85373.
Dawson Robert A.
Reifsnyder David
Thomas Broadbent & Sons Limited
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