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TURBOSCREEN screen bowl decanter centrifuge

Individual adaptation to the respective application

Screen decanter TURBOSCREEN type TSDT 1100

The TURBOSCREEN screen bowl decanter is one of the most advanced developments in solid-liquid separation technology.  It combines the process engineering advantages of a sedimenting decanter and a filtering centrifuge in one machine.

All TURBOSCREENs are individually adapted to the product conditions and system requirements

The solids are separated and thickened by sedimentation in the full jacket. This is followed by the downstream screening drum. The screen diameter and design can be adapted to the solids properties of the respective application.
The special design with a large screen drum and bearings on both sides enables high centrifugal forces and long retention times. As a result, slowly sedimenting solids can be separated very well, subsequently washed and dewatered up to the dewatering limit.
Centrate, filtrate and solids are discharged in separate outlets.

Operating behavior & mechanical features

The TURBOSCREEN optimally combines the advantages of the solid bowl centrifuge and the screen centrifuge in two working stages.

In the first process step, the solids are pre-dewatered on the drum cone in the full-jacket centrifuge section. The filling volume of the bowl and thus the length of the drying strand is infinitely adjustable via a weir disk. The clarified liquid is decanted via this weir disk.
The pre-thickened solids are discharged via a discharge edge into a downstream, much larger screening drum. Here, in the second working stage, the solids cake is broken up and redistributed with a lower pile corresponding to the larger volume available.

At the same time, the solids cake is subject to considerably higher centrifugal forces due to the large diameter, which makes it easier to filter out the residual liquid.
As relatively little liquid enters the screen section
with the well pre-thickened solids, the amount of fines passing through the screen drum is low and cannot be counted as a loss due to recirculation in the centrifuge.

The generously dimensioned sieve drum with its low solids content is also particularly suitable for washing. The washing liquid is drained separately from the mother liquor.

Hygenic Design | CIP

for processes with the highest hygienic requirements

The name SIEBTECHNIK TEMA is inseparably connected with dewatering tasks under the highest hygienic requirements. The separation of breadcrumbs from frying oil at temperatures of approx. 200°C with the SHORTBOWL decanter centrifuge, the centrifugation of lactose crystals for the production of baby food with the SHORTBOWL decanter centrifuge and the CONTURBEX screen scroll centrifuge or the production of high-purity inorganic salts with our CONTURBEX and pusher centrifuges are just a few examples. Design features include technical separation of the drive and process areas of the centrifuge, advanced sealing systems that are easy to clean by CIP.

To optimize centrifuges for hygienic applications or in areas where CIP must prevent cross-contamination, we use riboflavin tests to verify and optimize cleaning results.

In-house developed and USDA-certified CIP nozzles, in-house developed hygienic fittings, special hygienic surfaces or our sophisticated USDA-compliant sealing technology make many dewatering tasks possible with our centrifuges.

The Drive

Specially designed drive systems for optimal separation results

The solution to a separation problem depends on the drive of the centrifuge. The centrifugal force required for solid-liquid separation is determined by the speed of the bowl or screen. To achieve the right speed for optimum separation results, it is often necessary to keep the speeds variable. Our specialists will customize the required drive control for your application.

In screen scroll centrifuges and decanters, the differential speed of the solids conveying screw to the bowl is also critical. It determines the residence time of the solids in the centrifuge and therefore the separation efficiency.

The correct differential speed for your separation task is determined by selecting the right gear. The differential speed can be constant or variable. In the latter case, the backdrive is used, where the otherwise fixed input shaft of the gear is also driven. If you want to keep the screw speed completely independent of the bowl speed, hydraulic drives (Viscotherm) or two-stage gearboxes with an upstream differential planetary stage are used.

The drive system is continuously monitored to ensure the operational safety of your centrifuge. Overspeed, overcurrent and slippage are detected and reported to the machine control system for action.

Only a drive system specially designed for your separation task will lead to optimum separation results.

SHORTBOWL decanter centrifuge drive
Drive of a SHS pusher centrifuge
Drive decanter DZ7
Sieve screw centrifuge CONTURBEX - Drive side

Explosion protection | Inertization

Inerting our machines and systems can be necessary for a variety of reasons. In many industrial processes, it is necessary for safety reasons to reliably prevent the formation of an explosive atmosphere caused by dust or gases (ATEX).

In addition, it may be necessary to seal and blanket product spaces with inert gas, such as nitrogen (N₂) or carbon dioxide (CO₂), to prevent oxidation and maintain product quality.

Take advantage of the decades of cross-industry experience of SIEBTECHNIK specialists in sealing and inerting the process chambers of your centrifuges.
We are happy to work with our customers to develop an inerting concept for the integration of our machines into existing or planned systems.

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Screen decanter TURBOSCREEN type TSDT 1100
Screen decanter TURBOSCREEN type TSDT 1100
Interior view of the TURBOSCREEN screen decanter, view of the centrifuge screw
TURBOSCREEN sieve decanter - auger
Screen decanter TURBOSCREEN 3D Animation - Exterior view
TURBOSCREEN sieve decanter
Plant image: SIEBTECHNIK TEMA sieve screw centrifuge type CONTURBEX and a fluidized bed dryer from TEMA Process

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SHORTBOWL decanter for lactose in the production hall in Mülheim an der Ruhr

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