TURBOSCREEN™ – hybrid screen decanter
TURBOSCREEN hybrid screen decanter
The most advanced innovation in solid-liquid separating technology
The TURBOSCREEN screen decanter is one of the most advanced developments in solid-liquid separating technology. It has considerable design and technical process advantages over the well-known centrifuge designs.
On most present day solid bowl screen centrifuges the screening section is connected to the small diameter of the solid bowl cone and is dimensionally identical. This design arrangement has the disadvantage of offering a small volume and therefore a high solids capacity with reduced centrifugal force in the dewatering section of the centrifuge.
The Siebtechnik Tema TURBOSCREEN screen decanter is a hybrid machine consisting of a solid bowl in the product feed zone and a screen bowl fitted downstream. The solid materials are separated by means of sedimentation in the solid bowl and thickened. After this, the product can be washed and dewatered up to the mechanically separable dewatering limit.
Our special construction with a large-dimensioned screen bowl and support at both ends enables high centrifugal forces with long dwell times. This enables slow-settling solids to be well separated, then washed and dewatered up to the dewatering limit. The second stream of liquid is drained off through a separate liquid drain hole.
All TURBOSCREEN decanters are customised to suit our clients product conditions and system requirements.
Operational behaviour and mechanical characteristics
In a TURBOSCREEN, the advantages of solid bowl centrifuges and screen centrifuges are optimally combined in two work stages.
In the first process step the solid matter is pre-dewatered on the bowl cone in the solid bowl centrifuge section. The filling volume of the bowl, and thus the length of the drying section can be adjusted by means of a weir plate. The clarified liquid is decanted off over this weir plate.
The pre-thickened solid is discharged over a discharge edge into a much larger sized downstream screen bowl. Here at the second work stage the solids cake is broken up and redistributed with a lower head of material, proportional to the larger volume capacity.
At the same time the solids cake is subjected to considerably higher centrifugal forces, proportional to the large diameter, whereby the filtering out of the residual liquid is made easier.
Due to the well thickened solid matter comparatively little liquid passes into the screening section. The carry-over of very fine grains through the screen bowl is minimal and due to recirculation back to the centrifuge can not be rated as a loss.
The well sizes screen bowl with the low solid matter content is particularly suited for washing. Here the washing liquid is drained off separately from the mother liquor.
Technical specification
| TURBOSCREEN | ||||||||
|---|---|---|---|---|---|---|---|---|
| Type | TSD | 250/360 | 350/450 | 450/600 | 600/750 | 750/900 | 800/1000 | 1000/1200 |
| intermediate size on request | ||||||||
| Length | approx. mm | 2500 | 2800 | 3150 | 3350 | 4000 | 4200 | 4600 |
| Width | approx. mm | 1800 | 1850 | 2300 | 2500 | 2800 | 3000 | 3250 |
| Height | approx. mm | 920 | 1020 | 1300 | 1500 | 1800 | 1900 | 2100 |
| Weight | approx. kg | 1900 | 2650 | 4500 | 7000 | 11500 | 13500 | 18000 |
| subject to change without prior notice | ||||||||
Application
- Continuous operation
- High yield/minimum loss of solid matter
- Good washing results
- Mother liquor and washing liquid can be separated separately from each other
- Little residual moisture
- Flexible drive concept
- High machine availability
- Minimum maintenance
- Long service life
