D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/24 (2006.01) D21C 1/04 (2006.01) D21C 1/10 (2006.01) D21C 3/02 (2006.01) D21C 7/06 (2006.01)
Patent
CA 2294186
A method in connection with the pretreatment of comminuted fibrous material intended for chemical cellulose pulp production, wherein said comminuted fibrous material is fed through a low pressure system comprising a gas phase part followed by a liquid phase part, said liquid phase part including a low pressure circulation where a circulating liquid is withdrawn from said fibrous material and is recirculated back to said fibrous material in an upstream position, said fibrous material is sluiced (4) into a high pressure system comprising a liquid phase transfer part operatively connected to a digester (19). Hot process liquid (11, 12) and/or said circulating liquid (10) is evaporatively cooled by being allowed to flash within said low pressure system.
L'invention concerne un procédé concernant le prétraitement d'une matière fibreuse hachée destinée à la production de pâte à papier chimique. L'alimentation de la matière fibreuse hachée se fait par un système basse pression comprenant une partie phase gazeuse suivie d'une partie phase liquide. Cette partie phase liquide comporte une circulation basse pression où le liquide est extrait de la matière fibreuse et renvoyé vers cette matière fibreuse dans une position en amont. La matière fibreuse est cédée (4) à un système haute pression comprenant une partie transfert de phase liquide fonctionnellement reliée à un lessiveur (19). Le liquide de procédé à chaud (11, 12) et/ou le liquide de circulation (10) est refroidi par évaporation en pouvant être projeté dans le système basse pression.
Gustavsson Lennart
Snekkenes Vidar
Fetherstonhaugh & Co.
Kvaerner Pulping Ab
Metso Fiber Karlstad Ab
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