Trough screw classifier for ash

Trough screw classifier for ash designed and manufactured for a power plant. The ash trough classifier ia a process machine.

Which processes does the ash classifier solve?

1. It receives ash from the bottom of the burner
2. It humifidifies the ash in the water tank – the ash will slowly fall to the bottom of the trough conveyor
3. The humidification process cool down the ash and avoid dust emission to the environment
4. The ash is transported from the bottom of the classifier to the outlet into a container

The trough classifier solves a transportation task in combination with a cooling and an environmental task. BEMA has designed the machine in cooperation with the end customer. Key features in the technical solution for the trough classifier:

1. The outlet is placed above the water level which drains the ash before it is dumped into the container
2. A special internal bearing is developed in the following end to ensure water tightness. The bearing can be replaced from outside
3. The water level is controlled by using 2 level switches in 2 different heights
4. The ash trough screw conveyor has one internal moving part inside the water filled casing – an internal greased sliding bearing
5. The machine is manufactured in stainless steel because the ash/water are agressive
6. The complete mahcine needs more or less no maintenance

See a similar classifier solution for handling slags BEMA has designed the machine in close cooperation with the end customer. The idea of using a water tank for cooling and transportation of ash was developed together. This solution shows that the application space for screw conveyors are unlimited. In BEMA we have engineers and technicians who are able to design all types of screw conveyor solutions which are needed in the process industry. Contact us in BEMA if  you have a special process and transport task you need to solve.

FAQ: Ash Trough Conveyor Classifier for Ash

1. What is an ash trough conveyor classifier used for?

An ash trough conveyor classifier is designed for power plants to receive ash from the bottom of the burner and handle it safely and efficiently. The system humidifies the ash in a water tank, allowing it to sink slowly while cooling it down and reducing dust emissions.

2. How does the classification and cooling process work?

When ash enters the water-filled trough, it becomes moistened, which both cools the material and prevents airborne dust. An internal screw then transports the ash from the bottom of the tank to the outlet, which is positioned above the water level so excess water can drain before the ash is discharged into a container.

3. What technical features ensure reliable operation?

The machine contains only one moving part inside the water chamber: an internally greased sliding bearing. A specially developed watertight bearing is installed at the opposite end and can be replaced externally. Water levels are controlled by two level switches placed at different heights.

4. Why is stainless steel used for construction?

Because ash mixed with water is highly aggressive, the entire machine is built in stainless steel to ensure durability, corrosion resistance, and minimal maintenance over time.

5. How does BEMA contribute to the design process?

BEMA develops the classifier in close collaboration with the end customer. The water‑tank cooling concept was created jointly, demonstrating how screw conveyor technology can be adapted to a wide range of industrial process challenges.