Process and apparatus for the discharge of a medium

Details Process and apparatus for the discharge of a medium Process and apparatus for the discharge of a medium

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 7/08 (2006.01)

Patent

CA 2050158

The invention relates to a process and an apparatus for the discharge of a medium, preferably an aqueous fibrous material suspension, for instance a cellulosic fibrous material suspension, from a container (20), in particular a bleaching tower of the cellulose industry, treatmet medium, in particular diluting liquid, conveniently water, being fed to the medium via orifices in at least one rotatable agitating organ, in particular agitating arm,disposed in the area of the container bottom. The invention is mainlycharacterized in that the feeding of the. treatment medium, in particular the diluting liquid, through the orifices in the at least one agitating organ, in particular agitatig arm, is effected as a function of the state variables of the treatment medium, in particular the diluting liquid, and/or the medium to be discharged, in particular as a function of the pressure differential between the treatment medium and the medium to be discharged in the area of obturators for these orifices during the discharge operation.

L'invention a trait à un procédé et à un appareil pour évacuer une substance, de préférence une suspension aqueuse de matériau fibreux, par exemple une suspension de fibres de cellulose, d'un récipient (20), en particulier une tour de blanchiment de l'industrie de la cellulose, une substance de traitement, en particulier un liquide diluant, commodément de l'eau, étant ajoutée à la substance en venant par les orifices d'au moins un organe d'agitation rotatif, en particulier un bras agitateur, disposé près du fond du récipient. L'invention se caractérise principalement par le fait que la substance de traitement, en particulier le liquide diluant, venant par les orifices d'au moins un organe d'agitation rotatif, en particulier un bras agitateur, se fait en fonction des variables d'état de la substance de traitement, en particulier le liquide diluant, et/ou de la substance à évacuer, en particulier en fonction de la différence de pression entre la substance de traitement et la substance à évacuer dans la zone des obturateurs de ces orifices durant l'opération d'évacuation.

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