Solids Ejecting Centrifuge

Solids-ejecting centrifuge

Applications

centrifuge is hermetic solids-ejecting

centrifuge in clarifier execution. It is used for removing

suspended solids with particle sizes from approximately 0.5

to 500 μm from a liquid having a lower specific gravity than

the solids. The solids content in the feed is normally in the

range of 0.1-0.5% by volume, but can vary between different

duties.

The machine is frequently used in various beverages

Applications

Working principle

The feed is introduced to the rotating centrifuge bowl

from the bottom via the hollow drive spindle pipe and is accelerated in a distributor before entering the disc stack. It is between the discs that the separation takes

place. The liquid phase moves towards the centre of the bowl,

from where it is pumped out under pressure by means of a

built-in pump disc. The heavier solids phase is collected at the bowl

periphery from where it is discharged intermittently via the

centrifuge cyclone.

The solids discharge is achieved by a hydraulic system

below the separation space in the bowl which at certain

intervals forces the sliding bowl bottom (5) to drop down,

thus opening the solids ports at the bowl periphery.

The bowl is mounted on a vertical spindle driven by a

horizontally mounted motor via a worm gear.

Special features

Centrifuge has a variable, partial discharge, meaning

that the discharge volume can be adjusted. This system has

the advantage of giving a dry solids phase, thus minimising

liquid losses. Discharges take place at full speed without any

interruption of the feed. The separator is fully hermetical which eliminates oxygen

pick-up in the product and has a built-in pump disc for the

liquid phase which eliminates the need for an external pump.

The flange-mounted motor is of controlled torque type,

which eliminates the need for a clutch.

The drive system is splash lubricated and without any

need for an external lubrication circuit.

The frame top parts are water cooled.

· Nozzles for flushing of the sediment outlet

· Oil cooler

· Flushing above and under the bowl

· Flushing in cyclone

Standard design

All liquid-wetted parts are in high-grade stainless steel

and liquid-wetted rubber gaskets in nitrile.

The centrifuge is available with main connections

according to SMS standards.

The centrifuge is equipped with sensors for monitoring

vibration level and a cover switch to be used for preventing

the motor from being started unless the centrifuge top part

has been properly mounted.

The centrifuge is equipped with anchoring feet and

vibration dampers.

Technical specification

Max. throughput capacity 40 m3/h

Max. solids-handling capacity 480 dm3/h

Feed temperature range 0 -100 °C

Feed inlet pressure required 0-550 kPa

Liquid outlet pressure available 100-1000 kPa

Installed motor power 22 kW

Noise level (ISO 3744 or 3746) 80 dB(A

1) Valid for large paring disc. Actual throughput capacity

depends on amount and type of solids in the feed, viscosity

and required degree of clarification.

2) Wet solids. Actual amount depends on discharge volume and

application.

3) Valid for water at throughput capacity 10-40 m3/h, varies

depending on required liquid outlet pressure.

4) Valid for water at throughput capacity 10-40 m3/h and inlet

pressure of 600 kPa, varies depending on inlet pressure and

capacity.

Utilities consumption

Electric power : 9 - 18 kW

Operating liquid : 10 - 100 dm³/h + 1.5 dm³/discharge

Flushing liquid :  0 - 25 dm³/discharge

Cooling water : 0 - 100 dm³/h

Cooling water, oil cooler : 80 - 100 dm³/h

Cooling water, mechanical seals : 120 - 160 dm³/h

Instrument air 5 Ndm3/discharge