D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 7/06 (2006.01) D21C 3/24 (2006.01) D21C 7/14 (2006.01)
Patent
CA 2455172
A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfer device conventionally used in the prior art. Instead of a high pressure transfer device the steamed and slurried chips are pressurized using a single vane slurry pump in series with a centrifugal slurry pump both of which are located at least thirty feet below the top of the treatment vessel and for pressurizing the slurry to a pressure of at least about 10 bar gauge.
Cette invention se rapporte à un système et à un procédé permettant d'alimenter en matière fibreuse fragmentée, du type copeaux de bois, la partie supérieure d'une cuve de traitement, du type lessiveur en continu. Ledit procédé renforce la simplicité, l'exploitabilité et la maintenabilité d'une telle alimentation grâce à la suppression du dispositif de transfert à haute pression utilisé traditionnellement dans les installations conformes à l'état antérieur de la technique. Au lieu d'utiliser un dispositif de transfert à haute pression, on utilise une seule pompe à boue, située au moins 30 pieds en dessous de la partie supérieure de la cuve de traitement, pour mettre sous pression les copeaux cuits à la vapeur et réduits en boue, et ce à une pression supérieure ou égale à 10 bars.
Leavitt Aaron T.
Prough J. Robert
Stromberg C. Bertil
Andritz Inc.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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