Method and apparatus for feeding multiple digesters

Details Method and apparatus for feeding multiple digesters Method and apparatus for feeding multiple digesters

D - Textiles, Paper

21

C

D21C 1/02 (2006.01) D21C 7/06 (2006.01)

Patent

CA 2218670

A number of distinct parallel digesters are fed with chips from a common steaming vessel. After steaming the chips are slurried and pressurized, and substantially simultaneously the steamed, slurried, and pressurized chips are transferred to at least some of (and typically each of) the distinct parallel digesters. A material stream is split into a number of individually controllable material streams (one for each of the digesters) either at the discharge from the steaming vessel, after slurrying (or at the discharge from a slurrying vessel), or after pressurizing (e.g. in a high pressure transfer device). For example a multi-branch conduit may be connected to the slurry outlet from the high pressure transfer device, the conduit having a branch directly connected to each of the digesters. A distinct return conduit may also be provided from each of the digesters to the high pressure transfer device, each return conduit preferably has a distinct flow control device and/or pump which are individually controlled.

Un certain nombre de lessiveurs parallèles sont alimentés de copeaux provenant d'un réservoir d'étuvage commun. Après traitement à la vapeur, les copeaux réduits en bouillie et pressurisés sont acheminés vers certains ou vers l'ensemble des lessiveurs parallèles. Le flux de matières est réparti entre les lessiveurs (pour l'alimentation individuelle des lessiveurs), la répartition se faisant soit au point de déchargement du réservoir d'étuvage (ou au point de déchargement des malaxeurs), ou après l'étape de pressurisation (ex. : dans une installation de transfert haute pression). Par exemple, une canalisation à conduits multiples peut être raccordée à la sortie de l'installation de transfert haute pression, la canalisation comportant un conduit directement relié à chacun des lessiveurs parallèles. Un conduit de retour distinct pour chacun des lessiveurs pourra assurer le retour vers l'installation de transfert à haute pression, chaque conduit étant de préférence pourvu d'un appareil de régulation ou d'une pompe à commande individuelle.

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