Drying Systems
Directly heated drum dryers
Drying systems for flakes, OSB-standards and other biomass are efficient, versatile and robust
Our directly heated drum dryers are distinguished by their diverse heating possibilities, efficiency and robustness. This single-pass dryer is used for drying wood chips, OSB strands, beet pulp as well as all types of free-flowing wood material, biomass products and other bulk solids.
At a glance:
- Water evaporation capacity of up to 80 t/h, depending on the product
- Heated directly by multi-fuel burners in combustion chambers
- Heated directly by flue gas from energy systems
- Heated directly by exhaust gases from turbines or motors
- Any combination of these heating methods is possible
- For high moisture content levels and a proportion of recycled wood, a flash tube dryer can be attached to pre-dry and separate coarse materials
- Dust extraction takes place by means of cyclones or exhaust air cleaning systems
Drying process
Products to be dried enter the rotating single-pass dryer drum through an air-tight rotary valve. The dryer drum is equipped with specific components, depending on the type of product. This results in an increase in surface area and with it an increase
in efficiency.
The product is transported slowly through the dryer drum, by the internals of the dryer drum and the flow of the hot gases. Hot gases from the dryer flow around the product in a continuous current, heat it up and remove the moisture. After the product has passed through the dryer drum, cyclones separate it from cooled and moist dryer gases. Dependent on the product and systems involved, mechanical pre-separation with a drop box is also available for use.
At the end of the process, the dried product is discharged from the drying process through an air-tight rotary valve. To make use of the residual heat, dryer gases are partly recycled back into the mixing chamber. The other part is released as exhaust or sent through filter systems that are also available from our portfolio and cleaned.