Pumping of medium consistency, high temperature pulps from...

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 7/08 (2006.01) D21C 7/14 (2006.01)

Patent

CA 2241540

Pumping of medium consistency cellulose pulp is effected from stand pipes (500) or like small sized pulp vessels to which pulp is normally discharged from storage towers, treatment towers, washers, filters, presses, thickeners, or the like, particularly pumping of high temperature pulps from said stand pipes. A pump inlet is attached to a discharge opening (502) of a stand pipe (500), pressurizing cellulose pulp in said stand pipe (500) by closing the stand pipe (500) off from the atmosphere, maintaining a superatmospheric pressure in the stand pipe (500), allowing the cellulose pulp to flow into the pump through the pump inlet, and pumping the cellulose pulp further using the pump (30).

On effectue le pompage de pulpe cellulosique de consistance moyenne à partir de colonnes d'alimentation (500) ou de cuves à pulpe de petites dimensions, dans lesquelles la pulpe est normalement déchargée à partir de tours de stockage, de tours de traitement, de piles laveuses, de filtres, de presses, d'épaississeurs ou analogues, et notamment le pompage de pulpes à haute température à partir de colonnes d'alimentation. Un orifice d'entrée de la pompe est fixé à une ouverture de déchargement (502) d'une colonne d'alimentation (500), le processus de pompage s'effectuant en mettant sous pression la pulpe cellulosique dans ladite colonne (500), en fermant cette colonne (500) pour la séparer de la pression atmosphérique, en maintenant dans celle-ci une pression supérieure à la pression atmosphérique, permettant ainsi à la pulpe cellulosique de circuler dans la pompe à travers l'orifice d'entrée de celle-ci, et en pompant ensuite la pulpe à l'aide de la pompe (30).

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