Applications The WS design is used for sludge dewatering in a wide range of industrial paint waste, surface treatment and waste oil applications. Ideal for medium-capacity installations WS decanter centrifuges are designed to be efficient, simple to install, easy to maintain and straightforward to operate. Installation, operating and service life costs are minimal. The WS range features • fully enclosed process sections • critical parts made of wear-resistant material • high performance combined with low energy consumption. Benefits • recycling of liquids • reduces sludge volume, which cuts down on transport and disposal costs • continuous operation • compact, modular design saves space • low installed power reduces electricity consumption. Working principle Separation takes place in a horizontal cylindrical bowl equipped with a screw conveyor (see drawing on page two). The feed enters the bowl through a stationary inlet tube and is accelerated smoothly by an inlet distributor. The centrifugal force that stems from the rotation then causes sedimentation of the solids on the wall of the bowl. The conveyor rotates in the same direction as the bowl, but at a different speed, thus moving the solids towards the conical end of the bowl. The cake leaves the bowl through the solids discharge openings into the casing. Separation takes place throughout the entire length of the cylindrical part of the bowl, and the clarified liquid leaves the bowl by flowing over adjustable plate dams into the casing. WS 40, 60 High-performance decanter ALFA LAVAL is a trademark registered and owned by Alfa Laval Corporate AB. EFU00030EN_WS40_60.qxd 06-09-01 11.28 Sida 1 — www.fotoskrift.se —
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ApplicationsThe WS design is used for sludge dewatering in a wide range of industrial paint waste, surface treatment and waste oil applications.
Ideal for medium-capacity installationsWS decanter centrifuges are designed to be efficient, simple to install, easy to maintain and straightforward tooperate. Installation, operating and service life costs areminimal.
The WS range features• fully enclosed process sections• critical parts made of wear-resistant material• high performance combined with low energy
consumption.
Benefits• recycling of liquids• reduces sludge volume, which cuts down on
transport and disposal costs• continuous operation• compact, modular design saves space• low installed power reduces electricity consumption.
Working principleSeparation takes place in a horizontal cylindrical bowlequipped with a screw conveyor (see drawing on page two).The feed enters the bowl through a stationary inlet tube andis accelerated smoothly by an inlet distributor. The centrifugalforce that stems from the rotation then causes sedimentationof the solids on the wall of the bowl.
The conveyor rotates in the same direction as the bowl, but at a different speed, thus moving the solids towards theconical end of the bowl. The cake leaves the bowl throughthe solids discharge openings into the casing. Separationtakes place throughout the entire length of the cylindrical partof the bowl, and the clarified liquid leaves the bowl by flowingover adjustable plate dams into the casing.
WS 40, 60High-performance decanter
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Process optimizationWS decanter centrifuges can be adjusted to suit specificrequirements by varying the
• bowl speed to obtain the required G-force for optimizedseparation
• conveying speed for optimized balance between liquidclarity and solids dryness
• pond depth in the bowl for optimized balance betweenliquid clarity and solids dryness
• feed rate – WS decanter centrifuges are designed tohandle a wide range of flow rates.
DesignThe rotating part of these decanter centrifuges is mounted on a compact, in-line frame, with main bearings at both ends.Vibration dampers are placed under the frame. The rotatingpart is enclosed in a casing with a cover and a bottomsection with integrated outlets for both solids and the liquidbeing removed.
Drive systemThe bowl is driven by an electric motor and a V-belt trans-mission drive. Power is transferred to the conveyor by meansof a planetary gearbox, while an efficient backdrive systemregulates the difference between the speeds of the bowl andthe conveyor.
Direct Drive is a unique system developed by Alfa Laval forthe automatic control of conveying speed. This maintainsthe ideal balance between liquid clarity and solids dryness,irrespective of any variations in the feed.
The Direct Drive comprises a new type of gearbox andvariable frequency drive that prevent the bowl drive fromexposure to parasitic braking power. This simplifies theelectrical installation as well as minimizing power con-sumption. In addition, the Direct Drive provides accurate
control within a wide range of differentials, with no needto change belts and pulleys.
MaterialsThe bowl, conveyor, inlet tube, outlets, cover and other partsin direct contact with the process media are all made of stain-less steel. The discharge ports, conveyor flights and feedzone are protected with materials that are highly resistant toerosion. The frame is made of mild steel with an epoxyenamel finish.
Solids
Feed
Feed tube
Discharge port
Conical end
Inlet distributor
Wall of the bowl
Screw conveyor
LiquidGearbox
Close-up of screw conveyor (optional with tiles).
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Technical data
WS 40 WS 60Bowl diameter 353 mm (13.9 in.) 450 mm (17.7 in.)Bowl length 1460 mm (57.5 in.) 1910 mm (75.2 in.)Bowl speed max. 4000 rpm 3250 rpmG-force max. 3157 2657Weight 2200 kg (4850 lbs) 3800 kg (8380 lbs)Installed power 22–56 kW (30–75 hp) 50–80 kW (67–107 hp)Sound pressure level* 82 dB(A) re. 20 µPa 79 dB(A) re. 20 µPa
* Declared A-weighted emission sound pressure level in free field over a reflecting plane at 1 metre (39.4 inches) distance from the decanter operating atmaximum bowl speed, tested with water and closed outlet.
Dimensions
WS 40 3272 mm (129 in.) 845 mm (33 in.)
Max. Max.
1330
mm
(52
in.)
WS 60 4579 mm (180 in.)
LIQUID SOLIDSFEED
1271
mm
(50
in.)
1110 mm (44 in.)
Max.
LIQUID SOLIDS
FEED
Max.
WS 40
WS 60
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EFU00030EN 0609 Alfa Laval reserves the right to change specifications without prior notification.
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How to contact Alfa LavalUp-to-date Alfa Laval contact details for all countries are always available onour website at www.alfalaval.com
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