Filter for continuous filtration

B - Operations – Transporting – 01 – D

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B01D 33/00 (2006.01) B01D 19/00 (2006.01) B01D 33/21 (2006.01) B01D 36/00 (2006.01)

Patent

CA 2033982

A filter for continuous filtration of a liquid includes conventionally a vessel (1) having a center shaft (2) on which is arranged at least one rotatable filter element defining an inner space for liquid obtained at filtration. Further there is provided a washing device (6) for washing of material deposited on the filter element, a connection between said inner space and outlet means from said vessel and a separator (10) connected to said outlet and adapted for separating filtrate and gas. Means (19, 20) is provided outside said vessel for generating an overpressure in the gas space of the vessel and a lower pressure in the interior of the filter element at least corresponding to the evaporating temperature of the filtrated liquid for evaporation of the liquid in the separator. The separator (10) is provided with a cooling device (26) for cooling of the separated gas and an outlet for condensate obtained at cooling.

Un filtre de filtration continue d'un liquide comprend une cuve classique (1) dotée d'un arbre central (2), sur lequel est agencé au moins un élément de filtre rotatif définissant un espace intérieur destiné au liquide obtenu lors de la filtration. On a également prévu un dispositif de lavage (6) destiné à laver la matière déposée sur ledit élément de filtre, un raccordement entre ledit espace intérieur et le moyen de sortie de ladite cuve, ainsi qu'un séparateur (10) raccordé à ladite sortie, et adapté pour séparer un filtrat et un gaz. On a prévu des moyens (19, 20) à l'extérieur de ladite cuve destinés à créer une surpression dans l'espace de gaz de ladite cuve, et une souspression à l'intérieur dudit élément de filtre, correspondant au moins à la température d'évaporation du liquide filtré, afin de procéder à l'évaporation du liquide se trouvant dans ledit séparateur. Ledit séparateur (10) comporte un dispositif de refroidissement (26), destiné à refroidir le gaz séparé, ainsi qu'une sortie destinée au condensat obtenu lors du refroidissement.

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