B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 33/46 (2006.01) B01D 33/073 (2006.01) B01D 35/16 (2006.01) B01D 37/02 (2006.01)
Patent
CA 2160025
The present invention relates to a method and an apparatus for cleaning a filter drum or a cylinder used for thickening lime mud in which filter drum lime mud is thickened on a filtering layer of lime mud formed on the surface of a filter drum partially immersed in a vat containing lime mud. It is characteristic of the method of the invention that, before the lime mud cake is removed with a scraper from the surface of the precoat layer, a strip of lime mud is detached from the thickened lime mud layer with at least one liquid jet of low pressure movable in the longitudinal direction of the drum. It is characteristic of the apparatus of the invention that at least one nozzle (36, 38) is located in the rotational direction of the drum prior to the scraper removing lime mud cake and that the apparatus comprises, in addition to said at least one nozzle (36, 38), a jet nozzle (34) for making the precoat layer thinner.
L'invention concerne un procédé et un appareil permettant de nettoyer un tambour ou un cylindre filtrant utilisé pour épaissir les boues de caustification, lesdites boues étant épaissies sur une couche filtrante de boues de caustification formée à la surface d'un tambour filtrant partiellement immergé dans une cuve contenant des boues de caustification. Le procédé selon l'invention consiste à détacher une bande de boues de la couche de boues épaissie au moyen d'au moins un jet de liquide à basse pression mobile longitudinalement par rapport au tambour avant que le gateau de boues ne soit enlevé de la surface de la sous-couche au moyen d'un racleur. L'appareil selon l'invention comporte au moins un ajoutage (36, 38) orienté dans le sens de la rotation du tambour avant que le gateau de boue ne soit enlevé par le racleur, ainsi qu'un ajutage à jet (34) permettant d'amincir la pré-couche.
Ketolainen Vesa
Ruokolainen Pekka
Titoff Juha
Andritz-Ahlstrom Oy
Gowling Lafleur Henderson Llp
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