IN-LINE DRAINER WITH SHAPED SCREE SLOTS Russian patent published in 2016 - IPC D21C9/06 B01D29/48 B01D39/10 

FIELD: technological processes.

SUBSTANCE: invention relates to devices for draining liquid from black liquor slurry stream containing housing and solid fraction. Liquid separator for draining liquid from moving black liquor slurry stream contains cylindrical housing with an inlet located proximally to the first end of the cylindrical housing, a first outlet located proximally to the second end of the cylindrical housing, second outlet located proximally to the first end of the cylindrical housing, as well as internal chamber arranged between inlet and first outlet, wherein the inner chamber extends along the axis of the cylindrical housing. Separator comprises also the screen basket installed in the inner chamber of the cylindrical housing, wherein the screen basket is formed by a plate with side edges which are joined to form a black liquor slurry stream flow chamber, wherein the inlet and first outlet of the cylindrical housing are in fluid communication with the black liquor slurry stream flow chamber; liquid collection chamber formed between an outer surface of the screen basket and an inner surface of the cylindrical housing; second outlet on the cylindrical housing in fluid communication with the liquid collection chamber. Screen basket includes slots extending through the basket to provide liquid flow passages from the black liquor slurry stream flow chamber to the liquid collection chamber. Screen slots each having a length substantially greater than a width of the slot. Width of the slots is selected to retain solid particles of the moving black liquor slurry stream within the black liquor slurry stream flow chamber and block the solid particles from entering the liquid collection chamber. Slots have a length dimension which forms an oblique angle with respect to the axis of the cylindrical housing dimension of between about five degrees to ninety degrees, wherein slots each having a curved corner edge adjacent a surface screen basket facing the black liquor slurry stream flow. Slots are arranged in rows on the screen basket; rows are separated by solid sections of the screen basket, and all slots in each row are uniform in size, orientational positions and forms.

EFFECT: technical result is prevention of clogging and facilitation of passage of solid particles through the slot in the screen basket.

16 cl, 7 dwg