Method and apparatus for drying pulp

Details Method and apparatus for drying pulp Method and apparatus for drying pulp

F - Mech Eng,Light,Heat,Weapons

26

B

F26B 3/06 (2006.01) F26B 17/20 (2006.01) F26B 17/28 (2006.01)

Patent

CA 2336480

A fiber containing pulp, such as chemical pulp, mechanical pulp, thermomechanical pulp, TMP, de-inked water, or fiber containing sludge, is dried in an effective and efficient manner. The wet pulp is first dewatered mechanically, such as by using a drum or screw press. Then dewatered pulp is passed to a dryer. The dryer has first and second apertured cylindrical surfaces defining a gap between them, and drying gas is blown through one of the apertured surfaces, then through a pulp layer moving in the drying gap between the cylindrical surfaces, and then through the apertures in the other cylindrical surface, to evaporate water from the pulp and dry it to a dry matter content of over 80%, preferably about 85-90%.

L'invention concerne un procédé et un appareil de séchage de pâte contenant des fibres. La pâte humide est d'abord égouttée mécaniquement au moyen, par exemple, d'une presse (10) à tambour ou à vis, puis la pâte est saisie dans le sécheur cylindrique (12) dans lequel l'eau contenue dans la pâte est évaporée à l'aide de gaz chaud ou analogue. Dans le sécheur cylindrique, la pâte est séchée dans un espace (20) défini entre les première et seconde surfaces (16', 18') dans lesquelles sont ménagées des ouvertures, dans lesquelles la couche de pâte est disposée de manière à défiler dans le sécheur. Le gaz de séchage traverse la couche de pâte défilant dans l'espace de manière à évaporer l'eau contenue dans la pâte.

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