Apparatus and method for removing finely divided solids from a liquid flow

摘要

Apparatus (8) for filtering, clarifying or polishing, a liquid flow containing finely divided solids. In the apparatus (8), the liquid flow to be filtered is directed to the outer surface of a filter element (3) with high speed and in tangential direction, and thereby, influenced by the generated shearing force, part of the liquid penetrates the filter element (3) and is filtered. More precisely, the apparatus (8) includes a cross-flow tube (2) having a circular cylindrical shape and having apertures directed substantially in tangential direction towards the outer surface of the filter element (3). A method for removing finely divided solids from a liquid flow using such apparatus is also described.

主权项

1. An apparatus (8) for clarifying liquid containing finely divided solids, said apparatus (8) having a circular cylindrical shape and comprising:
at least one feed inlet (12) for feeding the liquid to be clarified into the apparatus (8), an outer mantle (1), a filter element (3), at least one outlet (13) at the upper part of said apparatus (8) and at least one outlet (13) at the lower part of said apparatus for arranging liquid retentate circulation, an outlet for draining filtrate out of the apparatus (8), and a circular cylindrical shaped cross-flow tube (2) between the filter element (3) and the outer mantle (1) positioned coaxially with the filter element (3), said cross-flow tube (2) having apertures (9) directed substantially in tangential direction towards the outer surface of the filter element (3), wherein said apertures (9) are provided over the length of the crossflow tube (2) and around the circumference thereof, and have a length in the axial direction of the crossflow tube of 1 to 150 mm and a width in the circumferential direction of the crossflow tube of 0.1 to 5 mm, with the length exceeding the width.