Centrifuges solid bowl decanter type

Solid bowl scroll decanter centrifuges have also been built vertically. The pendulum-type construction allows the bowl to expand more easily when operating at higher temperatures and makes mechanical sealing for elevated pressures less cumbersome. Although these units have been designed for operation up to 10 bars, they often operate at 5 bars or less. 

A centrifuged separator consists of a rotating bowl or basket into which the materials to be separated are fed. One type, operating by filtration, uses a perforated basket on which the solids are retained while the liquid passes through. The other uses a solid basket or bowl against which the solids deposit, while the liquid remains close to the center and is withdrawn over a dam. This latter type operates by accelerated settling and decantation and is also used for the separation of immiscible liquids. 

The liquid layer at the rotating bowl wall is maintained at the desired pond depth by the location of overflow weirs. These are adjustable ports located at the closed end of the bowl. The solids are continuously moved by scroll action to and then up the conical end of the rotating bowl, out of the pond, to drain as they move up the beach. Rnally, the solids are ejected from the open end of the bowl, thrown radially into a stationary collecting chute in the machine s casing, from which they drop into a container. Decanter centrifuges can be classified into three types ... 

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