Method and apparatus for thickening fiber suspension

Details Method and apparatus for thickening fiber suspension Method and apparatus for thickening fiber suspension

1987-12-09

1990-02-27

Fisher, Richard V.

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210767, 210808, C02F 100

Patent

active

049043951

ABSTRACT:
The present invention relates to a method and an apparatus for thickening of fiber suspension. In particular, the invention relates to removal of water from pulp which is caused to thicken in a closed space equipped with a fine-perforated or fine-slotted screen surface. The problem with the prior art devices has been their complex structure or, in simpler solutions, their great susceptibility to clogging. These problems have been found out to be overcome through dimensioning of perforations in the screen surfaces (28, 30; 38, 40) of the thickener and the flow channels (33; 37) between the filtering surfaces (28, 30; 38, 40) in such a way that the pulp flows in the channels as a plug flow, that is, the internal friction of the pulp is greater than the surface friction between the pulp and the screen surface.

REFERENCES:
patent: 3939075 (1976-02-01), Ginaven
patent: 4041560 (1977-08-01), Jacobsen
patent: 4096060 (1978-06-01), Lee et al.
patent: 4136035 (1979-01-01), Bogomolov et al.
patent: 4157302 (1979-06-01), Bergstedt
patent: 4396509 (1983-08-01), Foyn
"Medium Consistency Technology", Gullichen & Harkonen, Journal of the Tech. Assoc. of the Pulp and Paper Industry, vol. 64 (1981) Jun. No. 6, pp. 69-72.

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