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SHS pusher centrifuge

Application-oriented down to the last detail

Interior view of a pusher centrifuge SHS, you can see the movable steps that give it its name

The SHS really comes into its own when it comes to special process requirements: Long retention times, low solids loss in the filtrate, low grain breakage/abrasion, intensive washing of the solids cake, minimization of wear.

This makes it an excellent separation aggregate not only for many crystalline bulk products such as sodium or potassium chloride, sodium, ammonium or iron sulphate. It is also an ideal solution for processing “exotic” products such as granules, seeds, foodstuffs, fibers, animal bone meal and perhaps even your product.

Specialist for grain-friendly processing of solids

The SIEBTECHNIK TEMA SHS pusher centrifuge has established itself and proven itself as a modern high-performance unit in many industries. It reliably performs its separation task in crystalline applications. In addition, SIEBTECHNIK TEMA is one of the leading suppliers of pusher centrifuges for polymer products.

The basis for this success are individual design variants that fulfill complex separation tasks. All SIEBTECHNIK TEMA pusher centrifuges guarantee very good results, including low residual moisture, high solids yield and excellent washing efficiency. Particular attention is paid to the gentle processing of the solids. SIEBTECHNIK TEMA offers customized solutions, especially in the feed and discharge area, where the product flow is accelerated or slowed down again.

We would be happy to convince you of the performance of the SIEBTECHNIK TEMA SHS pusher centrifuge and work with you to design new solutions for your specific separation task.

Operating behavior & mechanical features

The pusher centrifuge belongs to the group of continuously operating filtration centrifuges. The solids are retained as a cake on a slotted screen basket and transported axially in stages towards the solids discharge housing by an oscillating movement of the moving floor. With the pusher centrifuge, the transport speed of the solids cake is lower than with the screen scroll centrifuge, for example, and the dwell time of the centrifuged material in the bowl is correspondingly longer.

The size of the solid particles to be separated is preferably over 80 μm. However, the thick, closed filter cake also ensures good removal of fine solids (self-filtration).
Both main features – the long retention time and the closed filter cake – therefore also enable economical post-dewatering of solids with a high proportion of fines
that have been pre-dewatered on filters of all types.

For many applications, the outer drum is cylindrically-conical (ZK).
This makes the difficult separation of gusset capillary liquid much easier. It also reduces the thrust energy required to transport the solids.

The filling system (patent no. DE 195 46 019 C1) with acceleration cone and ring cup ensures extremely gentle pre-acceleration and even distribution of the product. Even under unfavourable feeding conditions, the mechanical load on the machine can be minimized, especially with regard to wear.

An additional integrated sieve element enables product pre-thickening if required and therefore optimized filter cake formation.
The filtrate drain is generally designed so that the mother liquor and washing liquid can be drained separately.

Pusher centrifuge SHS for lithium hydroxide monohydrate, opened.
SHS pusher centrifuge in fertilizer production
SHS pusher centrifuge for sodium sulphate in the factory hall in Mülheim an der Ruhr
Pusher centrifuge for potassium chloride

Equipment variants

While the general trend is towards standardization, SIEBTECHNIK TEMA focuses on the details. Our specialists design and construct the special machine for and often together with the customer on a product-specific basis. This enables optimum efficiency to be achieved and individual requirements to be met.

SIEBTECHNIK TEMA has consistently developed a range of pusher centrifuge variants for a wide variety of applications, enabling them to be precisely tailored to the specific application. Up to 14 sizes with nominal drum diameters from 250 mm to 1200 mm are available for different throughput rates.

SIEBTECHNIK TEMA pusher centrifuges are built with one to four-stage rotors, depending on the application and dewaterability of the product.

Depending on the application, we manufacture all parts that come into contact with the centrifuged material from corrosion-resistant austenitic steels, special bronzes, Hastelloy, nickel, titanium and similar materials.

In the case of abrasive feed material, we protect vulnerable zones with wear-resistant materials and coatings.

Special designs

  • Filling system with pre-drainage (DBP)
  • Product feed through filling screw
  • Separate discharge/deaeration of mother liquor/washing liquid by means of double/multiple filtrate cyclone
  • Gas-tight process chamber sealing
  • Explosion-proof design in accordance with Directive 94/9/EC (ATEX 100a)
  • Food-safe design
  • Further special equipment on request

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.

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.

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Pusher centrifuge for potassium chloride
SHS pusher centrifuge for potassium chloride
Pusher centrifuge SHS for monosodium glutamate
Pusher centrifuge SHS for monosodium glutamate
SHS pusher centrifuge in fertilizer production
SHS pusher centrifuge in fertilizer production
SHS pusher centrifuge for sodium sulphate in the factory hall in Mülheim an der Ruhr
SHS pusher centrifuge for sodium sulphate
SHS pusher centrifuge for sodium carbonate - view from the gearbox side
SHS pusher centrifuge for sodium carbonate
SIEBTECHNIK TEMA SHS pusher centrifuge for Glauber's salt
SHS pusher centrifuge for Glauber's salt
Interior view of a pusher centrifuge SHS, you can see the movable steps that give it its name
Pusher centrifuge SHS
Pusher centrifuge SHS for lithium hydroxide monohydrate, opened.
Pusher centrifuge SHS - Lithium hydroxide monohydrate
SHS pusher centrifuge for lithium hydroxide monohydrate in the factory hall in Mülheim, closed
Pusher centrifuge SHS - Lithium hydroxide monohydrate
SHS pusher centrifuge for sodium carbonate
SHS pusher centrifuge for sodium carbonate
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