Alfa Laval Centrifugal Separator (Disc Centrifuge)

What is an Centrifugal Separator?

Alfa Laval centrifugal separator (disc centrifuges) is used for separation of 2 liquids while simultaneously removing fine solids down to ½ micron level. In other words Industrial Centrifuges are well suited for Solid/Liquid; Liquid/Liquid & Solid/Liquid/Liquid or 3 phase separation, on a continuous basis. Alfa Laval Inc. is the premier global industrial centrifuge manufacturer. This types of centrifugal separator is also referred to as oil separator, oil purifier, disc stack centrifuge, centrifugal filter etc.

Types of Centrifugal Separators

Alfa Laval Self Cleaning Centrifuge Bowl

Auto Desludging or Self Cleaning

The oil phase moves towards the center of the bowl and is discharged by a paring disc (4). The water phase leaves the bowl over the top disc (5) and through a paring disc (6). The heavier solids phase is collected at the bowl periphery, from where it is discharged intermittently in case of a self cleaning centrifuge. The solids needs to be manually evacuated in case of a solid bowl centrifuge.

The solids discharge is achieved by a hydraulic system below the separation space in the bowl, which at preset intervals forces the sliding bowl bottom (7) to drop down, thus opening the solids ports (8) at the bowl periphery. The bowl is mounted on a vertical spindle (9) driven by a electric motor through a gear-drive.

Types of Centrifugal Separators

Solid Bowl Centrifuge

Solids Retaining or Manual Cleaning

The feed is introduced to the rotating centrifuge bowl from the top (1) and is accelerated in a distributor (2)before entering the disc stack (3). It is between the discs that the separation takes place. The water and the heavier solids are forced towards the bowl wall where the solids accumulate and the water proceeds over the top disc (4) to an open outlet (5) clarifier version.
The light phase moves towards the center and leaves the bowl through a paring disc (6). The machine needs to be stopped at intervals for manual removal of the solids. The bowl is mounted on a vertical spindle (7) driven by a horizontally mounted motor, via a worm gear.