Method and device for the continuous cooking of chemical pulp

Details Method and device for the continuous cooking of chemical pulp Method and device for the continuous cooking of chemical pulp

D - Textiles, Paper

21

C

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

Patent

CA 2277931

A method in connection with continuous cooking of chips, comprising impregnation of the chips with impregnation liquid in an impregnation vessel (3) and cooking of the impregnated chips in a digester (4), the impregnation vessel and the digester being connected to each other by means of a transfer circulation, which partly, via a feed line (25), feeds the chips from an outlet end (27) of the impregnation vessel to the top of the digester for separation of free liquid in a separator (28), and partly, via a return line (26), feeds separated liquid from the top of the digester to the outlet end of the impregnation vessel for use as transfer liquid for the impregnated chips, besides which cooking liquid is added to the chips in the top of the digester. According to the invention, as a first part, less than 100 %, preferably less than 95 % and more preferred less than 90 % of the liquid which is separated from the chips in the transfer circulation, is recirculated to be used as transfer liquid.

Procédé concernant la cuisson continue de copeaux, qui consiste à imprégner lesdits copeaux à l'aide d'un liquide d'imprégnation dans une cuve (3) d'imprégnation et à cuire lesdits copeaux imprégnés dans un lessiveur (4). La cuve d'imprégnation et le lessiveur sont connectés l'un à l'autre à l'aide d'un circuit de transfert qui, d'une part, par l'intermédiaire d'une conduite d'alimentation (25), entraîne les copeaux de l'orifice de sortie (27) de la cuve d'imprégnation à la partie supérieure du lessiveur en vue de la séparation du liquide libre dans un séparateur (28) et d'autre part, par l'intermédiaire d'une conduite de retour (26), achemine du liquide séparé depuis la partie supérieure du lessiveur vers l'orifice de sortie de la cuve d'imprégnation pour que ce liquide serve de liquide de transfert aux copeaux imprégnés. En outre, du liquide de cuisson est ajouté aux copeaux dans la partie supérieure du lessiveur. Selon la présente invention, une première partie, soit moins de 100 %, de préférence moins de 95 % et idéalement 90 %, du liquide qui est séparé des copeaux dans le circuit de transfert, est mis en recirculation de manière à être utilisé comme liquide de transfert.

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