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Cooling Screw Conveyor | TIERMAX
Cooling Screw Conveyor | Screw cooler
Cooling screw conveyors are used to chill a wide range of bulk materials and pasty media. For a variety of application areas and bulk material compositions, cooling screw conveyors with specialized features are offered on the market. Cooling screw conveyor is suitable for all applications in which not only cautious handling of the bulk product, but also rigorous separation of the cooling medium and the bulk product is necessary, such as in food processing. Cooling screw conveyors can be used to transport various materials such as coal bottom ash and fly ash, plastics, sewage sludge, salts, cyanide, metal oxides, cement raw meal, pyrolysis residues and pastes of various formulations.
The application and temperature range of the cooling screw conveyors extends up to 1,200°C. Through active cooling of all surfaces touched by the product, long service life and low material impact can be achieved.
There are hardly any limits to their use – direct removal from the fluidized bed is just as easy for our cooling screw conveyors as their use in cooler cascades to gently control the temperature of large volume and mass flow rates.
Advantages of Heating & Cooling for Screw Conveyors:
Achievable power density – compared to energy transfer via shaft tube and trough (housing) only, the hollow flight principle achieves a far greater transfer performance.
The application and temperature range of the cooling screw conveyors extends up to 1,200°C.
Through active cooling of all surfaces touched by the product, long service life and low material impact can be achieved.
The proven self-cleaning principle is advisable for use with highly adhesive or pasty bulk products
A high degree of safety is ensured in handling the heat transfer media
Safe and reliable separation of heat transfer medium and bulk material
Suitable for all bulk materials
Use of proven and tested hollow flights
Application of Cooling Screw Conveyor:
Cooling ashes from 850°C to 150°C
Cooling activated coal granule from 700°C to 40°C
Cooling salts from 110°C to 50°C
Cooling sludge granule from 120°C to 32°C
Cooling cement raw meal from 900°C to 150°C
Cooling metal oxides from 500°C auf 50°C
Cooling pyrolysis residues from 560°C to 60°C
Cooling plastics from 120°C to 40°C
Technical specification of Cooling Screw Conveyor:
Operation temperatures
up to 1200°C
Shaft version
Single or multiple
Shaft design
Through-Shapes (Pipe Trough, U-Trough, ω-Trough, ωω-Trough)
Cooling Screw Conveyor or Screw cooler:
Due to their design, our screw heat exchangers differ from the standard models available on the market mainly due to the proven and tested hollow flight principle, which combines several advantages. The most outstanding advantage is the achievable power density-compared to energy transfer via shaft tube and trough (housing) only, the hollow flight principle achieves a far greater transfer performance.
This results in higher efficiency, or rather a smaller machine is required for a specific output and applications within higher output ranges are made possible by the hollow flight principle.
As some bulk products tend to form adhesions and tend to be bridging, they often build an insulating layer on the hollow flights.
Depending on the condition of your bulk product, sludge or paste, the self-cleaning provides a proven, reliable option for the screw heat exchanger, which ensures uniformly clean hollow flight surfaces. As these constitute the main surfaces for heat transfer, efficient operation can thus be ensured.
By using a special geometry, the gap in-between the hollow flights is nearly eliminated and a high relative speed is generated between the surfaces of the screw shafts. This in turn has a cleaning effect; it removes adhering bulk materials and results in greater efficiency. Only our self-cleaning technology allows the use of when processing adhesive and pasty bulk materials.
To achieve the above-named properties, the specially designed shafts are operated with equidirectional rotation, a speed ratio of 2:1 (shaft 1 to shaft 2) and relatively small spacings.
Available trough-shapes of cooling screw conveyors include Pipe trough, U-trough, ω-trough and ωω-trough .
