D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/24 (2006.01) D21C 7/00 (2006.01) D21C 7/08 (2006.01) D21C 9/00 (2006.01) D21C 9/10 (2006.01) F28D 7/00 (2006.01) F28D 7/10 (2006.01) F28F 1/40 (2006.01) F28F 13/06 (2006.01)
Patent
CA 2224685
The present invention relates to a method of and an apparatus for treating pulp in connection with digesting. The cellulosic material is digested to a kappa number of below 50, the digested pulp is taken at a consistency of 5 - 20 % to indirect heat exchange means having heat exchange surfaces within the flow means for changing the temperature of the discharged pulp. The pulp is allowed to flow in said indirect heat exchange means at an average velocity of less than 5 m/s. Thus, the pulp is cooled at least 10 ~C in said indirect heat exchange means so that the temperature of the pulp leaving said indirect heat exchange means is 80 to 130 ~C.
La présente invention concerne un procédé et un dispositif de traitement de la pâte à papier relatif au lessivage. Le procédé consiste à lessiver le matériau cellulosique jusqu'à l'obtention d'un indice kappa inférieur à 50, à envoyer la pâte ainsi lessivée dont la consistance est de 5 - 20 % à un organe d'échange thermique indirect dont les surfaces d'échange thermique se trouvent à l'intérieur du flux de façon à modifier la température de la pâte déchargée. La vitesse moyenne d'écoulement admise pour la pâte dans l'organe d'échange thermique indirect est inférieure à 5 m/s. Ainsi, la pâte se refroidit d'environ 10 ·C dans l'organe d'échange thermique indirect de façon que la température de la pâte quittant l'organe d'échange thermique indirect se situe entre 80 ·C et 130 ·C.
Henricson Kaj
Kettunen Auvo
Peltonen Kari
Ahlstrom Machinery Oy
Andritz Oy
Gowling Lafleur Henderson Llp
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