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CONTHICK screen bowl decanter centrifuge

Separation efficiency with pre-thickening

CONTHICK sieve decanter

The SIEBTECHNIK TEMA CONTHICK screen bowl decanter centrifuge is a combination machine consisting of a solid-wall drum in the product feed zone and a downstream screening drum.

The solids are separated and thickened by sedimentation in the full jacket. The product can then be washed and dewatered to the mechanically separable dewatering limit.

Special features of the CONTHICK screen bowl decanter centrifuge

Another special feature of the CONTHICK is the one-sided bearing of the machine, the so-called “flying bearing”. This design enables easy cleaning and quick access to the parts in contact with the product. This considerably reduces maintenance work and maintenance times.

The second liquid flow is discharged via a separate liquid shaft.

All CONTHICK centrifuges are individually adapted to the product conditions and system requirements.

Operating behavior & mechanical features

The design of this centrifuge is based on the technology of our CONTURBEX screen scroll centrifuge with the use of an additional pre-thickening stage. The aim is to achieve high separation efficiency even with low-concentration suspensions and a high yield of fines.

The task of this centrifuge is to separate solids and liquids from suspensions. The suspension is fed into the pre-thickening stage of the centrifuge via an inlet pipe through openings in the middle of the screw body.

The main liquid portion is discharged at the rear of the full-jacket drum via an infinitely adjustable weir in order to obtain a clear filtrate.
The solids are pre-thickened and transported
by the screw to the screen section, where residual dewatering and – if necessary – product washing takes place. The liquid flows from the full-jacket and screen sections can be discharged either individually or together via single or double cyclones.

The solids loss is relatively low and can be further minimized by returning the screen filtrate to the feed. The solids are transported from the screw via the cylindrical screen section to the solids discharge housing.
The centrifuge is equipped with a special profile slotted screen lining. Depending on the application, a special screen plate can also be used as an alternative. In any case, the screening elements can be replaced very easily without having to dismantle the machine or the rotating parts.

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.

Antrieb Dekantierzentrifuge SHORTBOWL
Antrieb einer SHS Schubzentrifuge
Antrieb Dekanter DZ7
Siebschneckenzentrifuge CONTURBEX - Antriebsseite

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.

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.

Gallery

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CONTHICK sieve decanter Detailed view of the centrifuge screw with pin ceramic tiles
CONTHICK screw with pin ceramic tiles
CONTHICK sieve decanter
CONTHICK sieve decanter
Hybridzentrifugen: 3D Bild eines CONTHICK Siebdekanters. Die Maschine ist der Länge nach offen, man sieht auf die Antriebseinheit und Trommel
Siebdekanter CONTHICK
Plant image: SIEBTECHNIK TEMA sieve screw centrifuge type CONTURBEX and a fluidized bed dryer from TEMA Process

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