Used Alfa laval three-phase decanter P2-325

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Introduction

Alfa laval three-phase decanter adopts a counter-current horizontal spiral discharge sedimentation centrifuge, with a duplex stainless steel drum. It features high-efficiency separation and durability.

Specification

Item	Specification
Designation	P2-325/305
Max. weight	2,300 kg (5,071 lbs)
Bowl material	AISI 316 or Duplex
Other product and liquid wetted parts	AISI 316
Typical main drive size	15 – 37 kW (20 – 50 HP)
Typical back drive size	5.5 – 11 kW (7.5 – 15 HP)
Back drive control	CT or VFD
Model	Counter-current horizontal spiral discharge sedimentation centrifuge (three-phase separation type)
Drum	Duplex stainless steel, diameter 360 mm, length 1512 mm (length-to-diameter ratio 4.2), half cone angle 10°
Maximum drum speed	4200 rpm
Separation factor	Up to 3500 G
Differential speed range	0.5~30 rpm (continuously adjustable, accuracy 0.1 rpm)
Screw	AISI 316 stainless steel, pitch 130 mm, blades with tungsten carbide wear blocks (5 mm thick)
Wetted parts	AISI 316 / Duplex stainless steel (Super Duplex optional)
Processing capacity	8~9 t/h (tar feed, solids content ≤10%)
Feed temperature range	0~100 °C
Maximum solid density	2.8 kg/dm³

Working principle

Separation takes place in a horizontal cylindrical bowl equipped

with a scroll conveyor. The product is fed into the bowl through a

stationary inlet tube and is then smoothly accelerated in a full flow

feed zone design. Centrifugal force deposits the solids on the

inner surface of the bowl.

Power consumption becomes power reduction The bowl can be equipped with specially developed power plates or tubes that harness and exploit hydraulic energy to reduce power consumption still further, while the unique 2Touch control system ensures easy, reliable process optimization. Some of the discharge velocity from the liquid leaving the unit is captured and re-directed in order to contribute to the bowl rotation. This results in a reduction in the velocity of the discharged liquid, which in turn reduces overall power requirements. Reducing power consumption also means being able to live up to new environmental regulations and helping to support a sustainable environment such as reduction in CO2 emissions.

Direct drive

The drive system that is an integral part of the P2 design was specially developed by Alfa Laval to make it possible to control the conveying speed automatically. This ensures the best possible balance between liquid clarity and solids dryness, irrespective of any variations in the feed flow that may occur. The Direct Drive system comprises an exceptionally efficient gearbox and variable frequency drive, which together avoid exposing the bowl drive to parasitic braking power. It also simplifies the electrical installation and keeps power consumption and CO2 emissions to the absolute minimum. In addition, the Direct Drive is capable of accurate control within the complete range of differentials, with no need for changing belts or pulleys.