B - Operations – Transporting – 04 – B
Patent
B - Operations, Transporting
04
B
233/15
B04B 11/02 (2006.01)
Patent
CA 1109439
- i - Abstract of the Disclosure A centrifuge for separating a solids-liquid slurry includes a rotor, rotatable about a vertical axis, with a vertically upstanding central drive shaft, frusto-conical discs vertically spaced one from another about the shaft, a hollow housing connected to the shaft and rotatable unitarily therewith, surrounding the discs and spaced therefrom, with the housing having a frusto-cylindrical central portion with horizontal nozzles for discharge of thickened solids therethrough and having upper and lower frusto-conical skirt portions which taper from the central portion towards the shaft, A stationary casing surrounds the rotor. Space between the casing and the central drive shaft defines a liquid outlet; a thickened solids outlet extends from the lower portion of the casing. A stationary inlet feed tube extends into the housing through a lower portion of the casing. A stationary baffle is interposed between the rotor and the casing, below the level of the discharge nozzles, and is separated from the inlet tube by an annular space defining a thicken- ed solids recycle inlet extending from a sump bounded by the baffle and the lower portion of the casing. The baffle is generously spaced away from the casing interior, so that a recycle solids path defined by the space between the baffle and the casing interior, up to the thickened solids recycle inlet, allows flow of recycle solids therethrough with - ii - flow rate and pressure drop being essentially independent of viscosity. The centrifuge includes toroidal means interposable into the annular space for adjustably varying the size of the thickened solids recycle inlet and also preferably includes manually adjustable means for main- taining a preselected pressure head within the sump by maintaining a preselected height of thickened recycle solids material between the baffle and the casing above the sump.
328947
Hill John H.
Shapiro Leonard
Borden Ladner Gervais Llp
Pennwalt Corporation
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