Centrifugal washer for paper pulp with means to feed pulp as a t

Details Centrifugal washer for paper pulp with means to feed pulp as a t Centrifugal washer for paper pulp with means to feed pulp as a t

1989-11-13

1991-05-07

Dawson, Robert A.

Liquid purification or separation

Processes

Separating

162 60, 162316, 162336, 210374, 210377, 210391, 210781, 494 36, B01D 3306, B01D 3362

Patent

active

050134604

ABSTRACT:
A method and apparatus provide for the effective centrifugal washing and/or thickening of paper pulp, using a perforated cylinder. A stock head box, located within the cylinder, applies a thin sheet of pulp on the interior the cylinder, at a high rate (e.g. about 20 meters per second), at a first arcuate position. The cylinder is rotated at high speed (e.g. 100 rpm, to provide an acceleration on the order of about 10 gs), whereby centrifugal force causes liquid in the pulp to move radially outwardly through the openings in the screen cylinder. The pulp is withdrawn from the interior of the cylinder by a vacuum roll or the like at a second arcuate position less than 360.degree. from the first position. The withdrawn pulp is moved by a screw conveyor or the like away from the cylinder in a dimension generally parallel to the axis of rotation, and the withdrawn liquid passes through channels in a drum surrounding the perforated cylinder, and is engaged by an impeller, and flows to a volute for removal. Wash water may be added by a wash water head box within the cylinder between the first and second arcuate positions. A drive roll operatively engages the exterior of the cylinder for effecting rotation.

REFERENCES:
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Kamyr M-57 Washer brochure, Ref. 181E, Kamyr AB of Karlstad, Sweden.
Handbook for Pulp & Paper Technologists, G. A. Smook, 1986, pp. 108 through 111.
Berry et al., "Optimization of `Fiberfuge` Washer Process Results,"; 1982 Pulping Conference, TAPPI Proceedings, pp. 457-459.

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