Method and system for conveying shredded pulp to an ozone...

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/153 (2006.01) D21C 7/06 (2006.01) D21C 9/18 (2006.01)

Patent

CA 2374796

A system for treatment of pulp comprises a dewa-tering device (2) for dewatering the pulp to a fibre concentration of at least 20 %, a reaction vessel (6) for bleaching the dewatered pulp through reaction with ozone gas and a pulp shredding device (4) for shredding the dewatered pulp before the latter is supplied to the reaction vessel. The pulp shredding device has a closed pulp shredding vessel (16), an outlet pipe (22) and a transport means (18) for continuous transport of the shredded pulp without com-pression out of the pulp shredding vessel via the outlet pipe, so that the latter kept filled with passing pulp. A conduit (28) gas sealed from the surroundings connects the outlet pipe (22) gas-tightly to the reaction vessel (6). A pressure regulation device (38, 40, 42, 44, 48) maintains a gas pressure (P1) in the pulp shredding vessel which is higher than the gas pressure (P2) in the reaction vessel.

L'invention concerne un système de traitement de pâte comprenant un dispositif d'égouttage (2) destiné à l'égouttage de la pâte dont la concentration en fibres est ramenée à au moins 20 %, une cuve de réaction (6) destinée au blanchiment de la pâte égouttée par réaction avec un gaz ozone, et un dispositif déchiqueteur (4) destiné à déchiqueter la pâte égouttée avant que celle-ci ne soit cédée à la cuve de réaction. Le dispositif déchiqueteur a une cuve de déchiquetage (16) fermée, une conduite de sortie (22) et un moyen de transport (18) destiné au transport continu de la pâte déchiquetée sans expulsion de la cuve de déchiquetage de pâte par la conduite de sortie, de telle façon que la conduite de sortie reste remplie de pâte qui circule. Une conduite (28) étanche au gaz de l'environnement relie la conduite de sortie (22) et la cuve de réaction (6) de façon étanche aux gaz. Un dispositif régulateur de pression (38, 40, 42, 44, 48) maintient, dans la cuve de déchiquetage, une pression de (P1) supérieure la pression de gaz (P2) régnant dans la cuve de réaction.

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