Feeding of washing liquid in a pulp washer

Details Feeding of washing liquid in a pulp washer Feeding of washing liquid in a pulp washer

D - Textiles, Paper

21

C

D21C 9/02 (2006.01) B01D 11/02 (2006.01) D21C 9/06 (2006.01) B01D 11/00 (2006.01)

Patent

CA 2276308

The present invention relates to a method of intensifying washing of pulp in various washing apparatuses. The method according to the invention is particularly well applicable in connection with a so-called DRUM DISPLACER washer by a A. AHLSTROM CORPORATION but also in connection with some washing presses. The method of performing a displacement wash of pulp, which method comprises feeding of the pulp to a washing system having one or more stages, washing of the pulp in the system and removal of the pulp therefrom, and feeding of wash liquid to the system and removal of at least one filtrate from the system is characterized in that part FN;x of the filtrate FN from at least one actual washing stage N is returned together with the filtrate FN+1 or part of it obtained from the next washing stage N+1 to the same washing stage to serve as wash liquid WN.

L'invention concerne un procédé permettant d'intensifier le lavage de la pâte à papier dans divers appareils de lavage. Le procédé de l'invention s'applique particulièrement bien à l'appareil de lavage DRUM DISPLACER? fabriqué par A. AHLSTROM CORPORATION mais également à certaines presses de lavage. Le procédé de lavage par déplacement, qui consiste à envoyer la pâte à papier dans un système de lavage à un ou plusieurs étages, à laver la pâte à papier dans le système, à l'enlever de ce dernier et à envoyer du liquide de lavage dans le système et à enlever au moins un filtrat du système, se caractérise en ce qu'une partie F¿N;x? du filtrat F¿N? provenant d'au moins un étage de lavage réel N est renvoyé conjointement avec le filtrat F¿N+1? ou qu'une partie de celui-ci, provenant de l'étage de lavage suivant N+1, est envoyée au même étage de lavage pour servir de liquide de lavage W¿N?.

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