Trough screw conveyors for ash

Trough screw conveyors for ash delivered for transporting cooled ash. Ash can in general be abrasive. But if the ash is cooled down it will be much less abrasive. The screw rotors for the trough conveyors are designed with paddle screw flights. The screw conveyor inlets are supplied with pneumatic gate valves which makes it possible to fully empty the screw conveyor after operation.

Why are paddle screw flights used in screw conveyors for ash?

1. Paddle screw flights are efficient to handle lumps in the ash
2. A paddle screw flight can break lumps into minor pieces
3. Screw rotors with paddle screw flights will create a small material layer between the end of the screw flight and the screw conveyor housing

Design considerations for trough screw conveyors for ash

1. Ensure low filling degree – 10-15% for ash screw conveyors
2. A low filling degree significantly increases the lifetime of the screw conveyor
3. Consider paddle screw design of the screw flights – see another example of a screw rotor with paddle design here
4. If the ash is abrasive consider Hardox screw flights. If the screw conveyor is inclined consider screw flights with chrome carbide
5. If the ash is not tempered consider heat tracing of the screw conveyor housing

A well designed screw rotor for ash will have a lifetime of 6-10 years. Poor designed screw rotors can have a lifetime of less than 1 year. See another example of a screw conveyor for ash here BEMA has experience from many different types of screw conveyor projects for ash. Our engineers and technicians can assist in selecting the right solutions to ensure a long life time for screw conveyor. We recommend that you take the necessary time to make a proper design of the ash screw conveyors due to save maintenance cost.

FAQ: Trough Screw Conveyors for Ash

1. What are trough screw conveyors for ash used for?

They are designed for transporting cooled ash, which is generally abrasive but becomes far less so when tempered. These conveyors ensure stable, controlled handling of ash in industrial processes.

2. Why are paddle screw flights used for ash?

Paddle flights efficiently break down ash lumps, create a protective material layer between the screw and housing, and improve overall flow. This design significantly enhances durability when handling irregular or compacted ash.

3. What design considerations improve lifetime and performance?

A low filling degree of 10–15% is crucial for extending service life. Depending on abrasiveness, Hardox flights or chrome‑carbide reinforcement may be needed. Heat tracing is recommended if the ash is not tempered.

4. How long is the expected lifetime of a well‑designed ash screw conveyor?

A properly engineered screw rotor typically lasts 6–10 years, while poorly designed systems may fail in less than a year—making correct design essential for reducing maintenance costs.

5. How does BEMA support customers in ash‑handling projects?

BEMA brings extensive experience from many ash‑handling installations. Their engineers help select the right design, materials, and configuration to ensure long lifetime and reliable operation.