Ash screw conveyor for humidifying

Ash screw conveyor for humidifying ash and slags in a power plant.

Why is ash humidified in a screw conveyor?

1. Humidifying is made to reduce dust expose from the ash and slags
2. A screw conveyor is well suited for the job because it can be completely closed
3. The screw conveyor can solve two issues – humidifying and mixing in one process

Ash screw conveyors require attention during design. A poor design of an ash screw conveyor will result in significantly shorter life time. Design points to consider in an ash screw conveyor

1. Temperature of the ash. Important to note if the ash is completely cooled down or coming directly from the boiler system
2. The inclination of the screw conveyor – in general make the inclination as small as possible
3. Ensure a low filling degree – low filling degree and low speed of the gearbox will prolong the lifetime of the screw rotor significantly
4. Avoid intermediate bearings in the screw conveyor!
5. Material selection – if the ash i agressive consider stainless steel material

See another example of a BEMA ash screw conveyor here BEMA has long experience in designing and manufacturing screw conveyors for ash and slag transport.

Types of ash screw conveyors BEMA supplies

1. Conventional transportation screw conveyors for ash and slag
2. Dosing screw conveyors where ash and slag are dosed into humidifying system
3. Heavy duty screw conveyors sitting directly under the boiler
4. Cooling screw conveyors for ash to cool down the material after the boiler

We recommend that you contact BEMA during your design phase to get the right type of product in the right dimension to ensure a long lifetime.

FAQ: Ash Screw Conveyor for Humidifying

1. What is an ash screw conveyor for humidifying used for?

An ash screw conveyor for humidifying is designed to mix ash and slag with water to reduce dust exposure and improve handling. Because the conveyor can be fully enclosed, it prevents dust emissions and ensures a controlled humidifying and mixing process.

2. Why is humidifying ash important in power plants?

Humidifying ash significantly reduces airborne dust, which improves workplace safety and environmental performance. The screw conveyor performs both humidifying and mixing in a single process, making it an efficient solution for ash‑handling systems.

3. What design factors are critical for ash screw conveyors?

Key considerations include the temperature of the ash, the inclination angle of the conveyor, and maintaining a low filling degree. Low speed and low filling degree greatly extend the lifetime of the screw rotor. It is also essential to avoid intermediate bearings, which wear quickly in abrasive ash environments.

4. Which materials are recommended for ash screw conveyors?

If the ash is aggressive, stainless steel is recommended to ensure durability and resistance to corrosion. Material selection is crucial for achieving long service life in harsh operating conditions.

5. What types of ash screw conveyors does BEMA supply?

BEMA provides a wide range of ash‑handling screw conveyors, including conventional transport screws, dosing screws for humidifying systems, heavy‑duty screws placed directly under boilers, and cooling screws for post‑boiler ash cooling. Early consultation with BEMA ensures correct sizing and long lifetime.