Simultaneous Liquid A - Liquid B - Solids separation · A solid bowl centrifuge (=decanter) is a sedimentation tank in a centrifugal field From Tank to Decanter centrifuge Simultaneous

Simultaneous Liquid A -Liquid B - Solids separationPIN-NL // PSE-NL - Spring Session 2017

ALEXANDER KRAUS, ENSCHEDE, 2017-04

• Principle of centrifugal separation

• Liquid – Liquid – Solid separation

• GEA machine portfolio used for centrifugal separation processes

• From spin tube to large scale process plants

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2Simultaneous Liquid/Liquid/Solids separation, Alexander Kraus, GEA Germany

Centrifugal force is produced through rotation around an axis. The force generated through the rotation acts in an outward direction. Depending on the speed of the rotating body, it increases or drops on the circular path.

Mechanical separation technology makes use of this property when light, heavy or substances of different density have to be separated from each other.

Centrifugal forces


The centrifugal forces act on all particles. The particles with the specifically higher weight are spun outwards fastest and most effectively. They then deposit on the edge of a container under centrifugal forces.

Centrifugal Forces in a Centrifuge

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Settling speed depending on particle size under earth gravity

Simultaneous Liquid/Liquid/Solids separation, Alexander Kraus, GEA Germany

Disc stack centrifuges Decanter centrifuges Cyclones, Filter centrifuges

5.000 – 14.000 Clarification area up to

300,000 m² Separation of emulsions Compact design 3-phase separation

1.500 – 5.000 Clarification area up to

30,000 m² Separation of emulsions Compact design 3-phase separation

300 – 1.500 low clarification area

Emulsions not separable Compact design 2-phase separation only

Typical g-factors – centrifuges allow high separationcapacity by compact design






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Settling tank for three phase mixture


Mixture

Organic phase

Aqueous phase

Sludge: waste

Gravitation1 g

Characteristics• Large volume• Emulsions not

treatable• Low energy

consumption• Only for easy

separation tasks

Mixture

Comparison static settling – centrifugal separationwith disc stack separator


Gravitation

1 g Centrifugalforces

7.000 g

2, 3 dischargeunder pressure

A solid bowl centrifuge (=decanter) is a sedimentation tank in a centrifugal field

From Tank to Decanter centrifuge

Simultaneous Liquid/Liquid/Solids separation, Alexander Kraus, GEA Germany 11

Crud Treatment in SX-Settler


Separated aqueous phase

Separated organic phase

crud phase

Crud Treatment


FEED:crud phase

organic phase

aqueous phasesolid phase

Separating Decanter


Separating zone diameter LP (Organic) discharge under pressure via centripetal pump





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Machine portfolio – GEA Separators


Gastight design3-phase designMaterials: Stainless Steel, Duplex, Super Duplex, Hastelloy/Incoloy cladding

Modular design: • Maximum flexibility• Perfect adaption for every application (e.g. flat and steep conical angle)• Large solid discharge diameters for optimum

dewatering of solids• Gastight design• 3-phase design

• Materials: Duplex, Super Duplex and Hastelloy C 276 WS

Range from CF 2000 – CF 8000• chemMaster• dryMaster• crudMaster

Machine portfolio - GEA Decanters






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Liquid / Liquid / Solids separation


solid

aqueous

organic

Process DevelopmentFrom spin tube to large scale process plants

GEA offers a versatile range of test centrifugation services. After each test our customers receive a detailed report, quantifying the technical and economic benefits of the GEA solution.


Example: TSE 40-01-577 on test-bay in Oelde/Germany for large customer in Chemistry


Feed

TargetNo organics in sludge

Example: Better clarification of organic phase needed- combination with existing process


Mixture

Aqueous phase + solids

Organic phase + rest aqueous phase + traces of solids

Organic phase

TargetClear organicphase

Example: Replacement of settling tank by centrifuge, reduction of hold up and space


TSE 40 Static settling tank

Space saving by using separators in comparison to static settling tanks. Separator bowl has only small hold up. In case hazardous liquids

are processed this is an advantage during operation and after shutdown. For separator CIP possible.

Better separation efficiency (1 g compared to several 1000 g)

~ 40,000 m² clarification area

gea.com

Separation technology: disc stack centrifuge


Documents

Simultaneous Liquid A - Liquid B - Solids separation · A solid bowl centrifuge (=decanter) is a sedimentation tank in a centrifugal field From Tank to Decanter centrifuge Simultaneous