Screw conveyors for transporting ash requires special attention because ash can be tricky to handle.

Tube conveyors for ash – key designing points

1. Design a low filling degree for the ash
2. Select a gear box with low speed
3. Consider heat tracing if the ash is coming from the boiler and have not been cooled down
4. Use rotary valves to reduce atmospheric air to come into the transport system

The combination of a low filling degree and a low speed for the screw conveyor will increase the lifetime of the screw conveyor exponentially. It is often seen that screw conveyors for ash have a high filling degree, and this is causing lower life time of the screw rotor due to wear.

See another example of ash screw conveyors

When designing screw conveyors for ash BEMA is taken care of the specific conditions of the ash:

1. The temperature
2. Eventually need for heat tracing and insulation
3. Placement of rotary valves
4. Other specific requirements for the tube conveyors

When BEMA design a complete series of screw conveyors we add the following components:

• Support for the screw conveyors
• Chutes and connection
• Elements for easy installation

All these components are manufactured to reduce the installation time on-site to save cost and obtain faster operation.

Together with the inclined screw conveyors and components we always deliver a documentation package containing:

• CE conformity approval
• Machine drawings including part lists
• Data sheets on wear parts