Inclined shaftless screw conveyor classifier – 23854

Inclined shaftless screw conveyor together with a tank for extraction of ash-sludge from a power plant. The ash-sludge have very fine particles. The particles enter the tank, go to the bottom and are extracted by the shaftless screw rotor.

The shaftless screw rotor have a very low RPM value to avoid mixing of the particles into the water.

The system takes out ash from process water in a simple and easy way. The systems avoids the process water to be treated in a special plant for handling this. This saves the power plant for expensive cost to handle poluted water.

What types of material are suitable for a screw classifier?

1. Materials that easy drop to the bottom of the water tank
2. Materals that do not dissolve in water
3. Materials that can be transported in a screw conveyor

See another example of a shaftless screw classifier

Why is a shaftless screw rotor effective to be used for a classifier

• The water will very easy drain off, when the material comes up above the water level in the tank

When you work with a classifier, you must be able to control the speed of the screw rotor when it is put in operation. Therefor you always shall combine a frequency inverter together with the electrical motor.

In this actual case the ash particles have a relatively low density. After installation the maintenance workes had to adjust:

• The speed of the shaftless screw rotor
• The time intervals between start and stop of the shaftless auger

After a few weeks, the screw classifier worked as planned.

In this process the engineers and technicians of BEMA supported the client to obtain a problem free operation of the screw classifier.