Method and device for the continuous cooking of pulp

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 3/24 (2006.01) D21C 7/06 (2006.01)

Patent

CA 2174970

The present invention relates to a method and a device for continuously producing pulp in which finely divided fibre material, preferably wood chips, is impregnated in a first vessel (1), preferably by being fed in at the top (2) and fed out from the bottom (3) of the said vessel (1), in which cooking pressure essentially prevails in the said first vessel (1) and the chips are heated and impregnated with the aid of displacement by black liquor in countercurrent and drawing off from the said first vessel (1) is effected from at least one draw-off screen (4), in which the chips which have been thoroughly impregnated with boiling hot black liquor are transferred to the top (5) of a steam-phase digester (6) from which pulp is fed out at the bottom (10) and which possesses at least one screen girdle (8) for drawing off spent liquor, with at least 50% of the quantity of liquor required for the cooking reaction, and allocated for this purpose, being supplied separately to the steam space (7) of the digester (6), preferably in the form of finely divided drops. Whereby the balance (27) of cooking liquor preferably is added to a lower countercurrent digesting zone (14).

L'invention concerne un procédé et un dispositif de production continue de pâte à papier dans lesquels une matière fibreuse finement divisée, de préférence des copeaux de bois, est imprégnée dans un premier récipient (1) dans lequel elle arrive, de préférence, par la partie supérieure (2) de ce dernier, et duquel elle est évacuée par le fond (3), une pression de cuisson prédominant dans ledit récipient (1), et les copeaux étant chauffés et imprégnés par déplacement au moyen de la liqueur noire à contre-courant. L'évacuation dudit premier récipient s'effectue à partir d'au moins un tamis d'évacuation (4) dans leuqel les copeaux préalablement imprégnés avec soin avec la liqueur noire chaude en ébullition sont envoyés au sommet (5) d'un lessiveur à phase vapeur (6) depuis lequel la pâte à papier est évacuée par le fond (10) et possédant une ceinture de tamisage (8) destinée à évacuer la liqueur usée, au moins 50 % du volume de liqueur requis pour la réaction de cuisson et prévu à cet effet étant envoyé séparément dans l'espace à vapeur (7) du lessiveur (6), de préférence sous forme de gouttelettes finement divisées. Le solde (27) de liqueur de cuisson est, de préférence, ajouté dans une zone de lessivage à contre-courant inférieure (14).

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