C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 11/12 (2006.01) B01D 5/00 (2006.01) B01D 35/027 (2006.01) C02F 11/00 (2006.01)
Patent
CA 2662420
An object of the present invention is to provide a filtering and condensing apparatus of the suction type which is capable of securing the filtering performance without deteriorating the filtering efficiency. A filtering and condensing apparatus of a suction type comprises a sludge tank for containing sludge to be filtered and condensed, and a filtering plate disposed to be in the sludge tank and extending in the vertical direction of the sludge tank. The filtering plate includes vertical extending convex and concave portions on its surface, and a filtering cloth in a bag form to house the supporting plate, whereby a filtering chamber is formed between the filtering cloth and the filtering plate and a main flow passage for the filtrate which vertically extends is formed between the inner surface of the filtering cloth and the concave portion of the supporting plate. The apparatus further includes a means for sucking the filtering cloth through the filtering chamber, a means for expanding the filtering cloth through the filtering chamber by feeding an air toward the filtering cloth via the filtering chamber, and a filtrate discharge tube one end of which is communicated with the filtering chamber. The lateral length of the filtering cloth is set to be longer than the lateral length of the supporting plate over its entire vertical direction, whereby, in a case where the sludge in the sludge tank is filtered and condensed under the predetermined negative pressure by the sucking means, a temporary sub-flow passage for the filtrate which is communicated with the filtering chamber and extends in the vertical direction of the filtering chamber is formed.
La présente invention concerne un appareil de filtration-condensation de type aspiration, qui comprend un bain de filtration-condensation (12) destiné à loger un objet de filtration-condensation, et une pluralité de plaques filtrantes (14) disposées dans le bain de filtration-condensation (12). Chacune des plaques filtrantes (14) comprend une plaque support (50) avec des rugosités verticales en surface et ayant la forme d'un filet, et un tissu filtrant sous forme de sac (18) destiné à loger la plaque support (50), de sorte qu'une chambre filtrante (76) soit formée par la face interne du tissu filtrant (18) et la plaque support (50), et de sorte qu'un passage principal s'étendant verticalement, destiné au filtrat, se forme entre la face interne du tissu filtrant (18) et l'évidement de la plaque support (50). L'invention concerne en outre un moyen d'aspiration (16) destiné à aspirer le tissu filtrant (18), un moyen de gonflage du tissu filtrant (20) destiné à gonfler le tissu filtrant (18), et un tuyau de déchargement du filtrat (38) communiquant à une de ses extrémités avec la chambre filtrante (76). L'appareil de filtration-condensation de type aspiration est caractérisé en ce que la longueur transversale du tissu filtrant (18) est fixée à une valeur supérieure à la longueur transversale de la plaque support (50), et en ce qu'un passage auxiliaire temporaire (99) pour le filtrat est formé, au moment de la filtration et de la condensation sous une pression négative prédéterminée, pour communiquer avec la chambre filtrante (76) et pour s'étendre verticalement depuis la chambre filtrante (76).
Kunitani Tadashi
Sakai Eiji
Yamane Hiroyasu
Barrigar Intellectual Property Law
Metawater Co. Ltd.
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