Method and device for dilution of cellulose pulp

D - Textiles – Paper – 21 – C

Patent

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

Patent

CA 2560391

The invention concerns a method and a device for the dilution of dewatered cellulose pulp that maintains a consistency of 20-30% of greater. By shredding of the pulp to a finely divided dry granulate, dilution to a homogeneous consistency in the medium consistency range can take place exclusively through hydrodynamic effects from the addition of dilution fluid. The dilution fluid is added to the granulate at a position at which the granulate is in the free fall in a stand pipe (22, 40) and above a level LiqLEV of diluted pulp in the stand pipe. A number of nozzles are arranged around the periphery of the stand pipe, directed in towards the centre of the stand pipe, obliquely downwards in the direction of fall of the granulate. It is possible through this simplified procedure to avoid completely the conventional dilution screws, and this reduces the investment costs and operating costs, while at the same time unnecessary mechanical influence of the pulp fibres can be avoided.

Cette invention concerne un procédé et un dispositif de dilution de pâte cellulosique deshydratée qui conserve une concentration comprise entre 20 et 30 % ou plus. Le déchiquetage de la pâte en granulés secs très fins permet d'obtenir une dilution en une concentration homogène comprise dans la gamme de concentration moyenne exclusivement au moyen d'effets hydrodynamiques à partir de l'ajout de fluide de dilution. Le fluide de dilution est ajouté aux granulés à l'endroit où les granulés sont en chute libre dans une conduite verticale (22, 40) et au dessus du niveau (LiqLEV) de pâte diluée dans la conduite verticale. Un certain nombre de buses sont disposées autour de la périphérie de la conduite verticale, tournées vers le centre de la conduite verticale, inclinées vers le bas dans le sens de la chute des granulés. Cette procédure simplifiée permet d'une part d'éliminer complètement le recours aux hélices de dilution conventionnelles, ce qui réduit les coûts d'investissement et les coûts de fonctionnement, et d'autre part de supprimer l'influence mécanique inutile des fibres de pâte.

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