Arrangement for the treatment of cellulose pulp in a washing...

Details Arrangement for the treatment of cellulose pulp in a washing... Arrangement for the treatment of cellulose pulp in a washing...

D - Textiles, Paper

21

C

D21C 9/06 (2006.01)

Patent

CA 2609462

A washing arrangement for washing and dewatering cellulose pulp, comprising a rotary drum (1) with a plurality of external compartments (2) on the drum for the pulp to be washed, which compartments are defined by axial compartment walls (3) distributed along the circumference of the drum, a stationary cylindric casing (8) enclosing the drum, whereby a ring-shaped space is defined between the casing and the drum and where the ring-shaped space by means of longitudinal seals in the axial direction of the drum is divided into a forming zone for forming the pulp in the compartments of the drum, at least one washing zone for washing the pulp at overpressure, and a discharge zone for feeding out the washed pulp, and where the filtrates from different washing stages are collected in a peripheral valve located at the end wall of the drum, where the filtrate stages are separated by seals in the valve, where at least some of the valve seals in the peripheral valve are displaced in relation to the corresponding longitudinal seal, seen in the rotation direction of the drum.

L'invention concerne un dispositif de lavage et de déshydratation de pâte de cellulose, comprenant un tambour rotatif (1), sur lequel sont formés une pluralité de compartiments (2) externes, destiné à recevoir la pâte devant être lavée, ces compartiments étant délimités par des parois (3) axiales réparties sur le pourtour du tambour, et une enveloppe cylindrique (8) entourant le tambour. Un espace annulaire est formé entre l'enveloppe est le tambour, cet espace annulaire étant divisé par des éléments d'obturation longitudinaux dans la direction axiale du tambour, de manière à former une zone de formation, permettant de former la pâte dans les compartiments du tambour, au moins une zone de lavage permettant de laver la pâte en surpression, et une zone de sortie permettant d'extraire la pâte lavée: Les filtrats des différents étages de lavage sont collectés par une soupape périphérique disposée dans la paroi terminale du tambour, et les étages de filtrats sont séparés par des éléments d'obturation de soupape. Au moins une partie des éléments d'obturation de la soupape périphérique sont décalés relativement à l'élément d'obturation longitudinal correspondant lorsqu'ils sont vus dans la direction de rotation du tambour.

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