D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/153 (2006.01) D21C 7/06 (2006.01) D21C 9/10 (2006.01) D21C 7/08 (2006.01)
Patent
CA 2462264
A system for treating pulp comprises a dewatering device (2) for dewatering the pulp to a fiber concentration of at least 20%, a closed pulp-shredding vessel (16) for shredding the dewatered pulp, and an outlet pipe (22) from the pulp-shredding vessel. A transport screw (18) is arranged in the outlet pipe for transporting the shredded pulp from the pulp-shredding vessel through the outlet pipe through a reactor vessel (6) for bleaching the shredded pulp through reaction with ozone gas. The outlet pipe (22) is designed with a heightened roof portion (27), so that an upper gas space (29) free from pulp is formed in the outlet pipe between the roof portion and the transport screw. A flow-restraining member in the form of a partition wall (31) is arranged in the upper gas space in the outlet pipe for restraining the gas flow through the gas space, whereby the pumping action of the transport screw in the outlet pipe is decreased.
L'invention concerne un système de traitement de la pâte à papier qui comprend un dispositif d'essorage (2) qui essore la pâte à papier à une concentration de fibre d'au moins 20%, une cuve de déchiquetage (16) fermée qui déchiquette la pâte à papier essorée, et un tuyau d'évacuation (22) de ladite cuve. Une vis transporteuse (18), disposée dans le tuyau d'évacuation, transporte la pâte à papier déchiquetée de la cuve de déchiquetage à travers ledit tuyau vers une cuve de réaction (6) en vue du blanchiment de la pâte déchiquetée par le biais de la réaction avec l'ozone. Le tuyau d'évacuation (22) est conçu avec un plafond (27) rehaussé, de façon qu'un espace gazeux supérieur (29) sans pâte à papier se forme dans ledit tuyau entre le plafond et la vis transporteuse. Un élément de limitation d'écoulement sous la forme de cloison (31), disposé dans l'espace gazeux supérieur du tuyau d'évacuation, limite le débit gazeux traversant ledit espace, ce qui permet de réduire l'action de pompage de la vis transporteuse dans le tuyau d'évacuation.
Astrom Per
Bokstrom Monica
Fetherstonhaugh & Co.
Metso Paper Inc
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