Method of drying lignocellulose material

B - Operations – Transporting – 04 – C

Patent

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Details

B04C 5/30 (2006.01) B04C 5/26 (2006.01) B27N 1/00 (2006.01) F26B 17/10 (2006.01) F26B 21/02 (2006.01)

Patent

CA 2392483

A method of drying lignocellulosic fibrous material in two steps in connection with the manufacture of fiberboard. The material is transported with the help of a first drying gas through a first drying line (11) to a first cyclone (13) where the first drying gas is conducted away from the material. Thereafter the material is transported with the help to a second drying gas through a second drying line (17) of a second cyclone (19) where the second drying gas is conducted away while the material is advanced to a subsequent step. The second drying gas, which is conducted away from the second cyclone (19), is moved to the first drying step and used as a portion of the first drying gas. A portion of the first drying gas, which is conducted away from the first cyclone (13), is reclycled and used as drying gas at the first drying step.

L'invention concerne un procédé permettant de sécher une matière de fibres lignocellulosiques en deux étapes dans la production de panneaux de fibres. La matière est transportée à l'aide d'un premier gaz de séchage dans une première ligne de séchage (11) jusqu'à un premier cyclone (13) où le premier gaz de séchage est séparé de la matière. Ensuite, la matière est transportée à l'aide d'un deuxième gaz de séchage dans une deuxième ligne de séchage (17) jusqu'à un deuxième cyclone (19) où le gaz de séchage est évacué tandis que la matière est amenée jusqu'à l'opération suivante. Le deuxième gaz de séchage qui est évacué du deuxième cyclone (19), est amené jusqu'à la première opération de séchage et utilisé comme une part de premier gaz de séchage. Une part du premier gaz de séchage qui est évacuée du premier cyclone (13) est recyclée et utilisée comme gaz de séchage au niveau de la première opération de séchage.

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