HOME > Products > Process Systems and Equipment > Screw Heat Exchanger
We provide unique solutions for each specific field of application and cover the entire process portfolio, including cooling-off bulk-solids such as bed-ashes, drying of sludges or pastures, and heating-off, such as petcoke for the anode lines of the aluminium industry, among other applications.
Our screw heat exchangers vary substantially from the usual versions available on the market due to the fact that screw heat exchangers use the well-proven Hollow-Flight Principle, which contains a number of advantageous characteristics. The possible power density is a significant benefit as compared to the energy transfer through shaft tube and trough, which is a disadvantage (housing). With the help of the Hollow-Flight Principle, we are able to accomplish a multiple of transmission power, which results in improved efficiency and allows us to use a smaller machine size for a given output.
Maximum capacity by active heat contacting surfaces
Compact design
Absolute safe separation of heat transfer medium and product
Low thermal stress of the flight material
Explosion safe acc. to ATEX guidelines (inner zones as also outer zones)
Free choice of heat transfer medium (water, steam, thermal oil, brine, freezing agent etc.)
The temperature range of the screw heat exchangers extends from 1200°C (cooling) to over 220°C (heating)
Heat transfer media temperatures above 350°C.
Process room pressure from 20mbar abs. up to 30 bar
Forced mechanical cleaning
High shear forces
Clean surfaces ensure efficient energy transport
Speed ratio of the shafts 2:1 (same rotational direction)
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.
