Proven technology, modern application

The working principle of the The Alfdex oil mist separator originates from Alfa Laval’s century old technology for industrial cetrifugal separators. Now it’s been specially adapted to this application for diesel engines in the capacity range 5–16 litres.

The oil mist separator is built around a rotating conical disc stack. An oil turbine at the bottom of the centrifuge drives the disc stack. Part of the lubricating oil circulating in the engine is routed to a nozzle that directs an oil jet to drive the turbine.

The oil and soot particles are removed from the gas by means of centrifugal forces of around 2.500-3.000 G at a separator speed of 7.000-9.000 rpm.

The centrifugal force makes the droplets and particles coalesce and form larger clusters that flow towards the outer edge of the discs. From there they are discharged onto the inner wall of the separator housing. The droplets and particles then flow down to the bottom of the separator, before finally being returned to the engine sump.

Effectively driven by oil
The Alfdex separator is driven by oil, an oil turbine at the bottom of the centrifuge drives the disc stack in the separator. Part of the lubricating oil circulating in the engine is routed to a nozzle that directs an oil jet to drive the turbine.

The advantage of an oil-driven separator is that there already is a surplus of oil flow available from the engine’s lubrication pump, and this is more than sufficient to drive the separator. Using oil to drive the unit also guarantees that the bearings are properly lubricated throughout the separator’s service life, which is the same as the lifetime of the engine.

 

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