Heating Screw Conveyors

are typically used for heating, drying or heat treatment of all types of bulk products such as petroleum coke, pasty media, dusts, pastes or slurries. Our heating screw conveyors introduce a defined quantity of heat into the product to heat or melt it, to evaporate liquid components or to start or stop a reaction.

Our heating screw conveyors stand out from other systems available on the world market due to the sophisticated design and use of the proven and tested proven hollow flight principle. It delivers the decisive advantages for maintenance, service life, efficiency and space requirements and guarantees maximum performance in the smallest space. The optional modular insulation is extremely maintenance-friendly, because panels can be quickly removed. This ensures the best possible utilisation of the process-heat-added by minimising radiation losses.

We have also found a solution to compensate for the thermal expansion of the worm shafts: It is completely accommodated by the specially developed KÖLLEMANN carbon bearing with the lowest possible maintenance work and costs.  (It is available on selected models, depending on the technical necessity.) The tongue-shaped shaft passages allow individual worm shafts to be easily replaced without dismantling the end wall or other shafts. This minimizes downtimes significantly.

The spectrum of heating screw conveyors ranges from a throughput capacity of a few kg/h up to 60t/h . On request the delivery is completed by including  specially adapted piping with modular insulation, which enables the connection to a central inlet and outlet point. All necessary valves and flow meters as well as temperature measurements are optionally pre-assembled in the scope of supply.

To integrate the heating screw conveyors into the planning of your plant, you can use a variety of heat sources such as heat transfer oils, various steam conditioning systems and purely electric heating.

As some bulk products have a strong tendency to stick and bridge, they often form an insulating layer on the hollow flights. Depending on the conditioning of the bulk product, the sludge or the paste, we have developed the tried and tested option of a self-cleaning system for equipping the heating screw conveyor to ensure constant clean surfaces. Since these are the main surface for heat transfer, efficient operation can be ensured.

KÖLLEMANN manufactures the heating screw conveyors in accordance with well-known regulations such as AD2000 or ASME BPVC Sec.8 div.1 in order to ensure maximum safety in handling the heat transfer media.

Suitable for all bulk materials and temperatures up to 450°C

Modular insulation available

On request with piping and fittings

Construction according to the proven Hollow-Flight principle

Reliable separation of heat transfer medium and bulk material

Single or multi-shaft design

According to the hollow-flight principle, screw flights are hollow, so that they provide a path for a cooling or heating medium to flow through. This means that bulk materials that have to be thermally processed, can be cooled, heated or kept at a constant temperature. Screw conveyors with conventional design only allow the heating or cooling medium to flow through the housing and optionally the worm shaft, where as the hollow screw flights of our KÖLLEMANN screw-heat-exhanger are used for heat or cooling transfer by means of a thermal medium along the entire length of the screw. With the active use of the screw flight as heat exchange surface, the efficiency of the thermal heat transfer of a screw heat exchanger increases disproportionately. The hot or cold surfaces of the screw flights are in constant contact with the bulk product and allow an optimum heat exchange .

The screw flight surface makes up more than two-thirds of the entire product-contacting surface of a screw heat exchanger. Thus, compared to conventional products, the Köllemann screw-heat- exchanger has considerably more area per meter of conveying path and thus a considerably higher efficiency.

The supplied heat is utilized to the maximum by minimizing radiation losses. This results in a multiple of the transfer capacity and is the only reason why applications in higher performance ranges can be realised at all. This process  offers great advantages in terms of maintenance, service life, efficiency and space requirements of the machine. This design allows maximum performance in the smallest space.

Your contact partner

Matthias Ginster
Head of Sales