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Generally, high-quality drying of the initial product is necessary for producing wood pellets and chips. Forest-fresh wood can have a water content of 40 % to 60 %. Through drying to a water content of 10 % to 12 %, the calorific value of approx. 2 kWh/kg is increased to approx. 4.5 kWh/kg. Thus ideal conditions for direct firing with a simple plant system or an optimum ability of pelletizing for producing high-quality wood pellets are achieved.
The STELA drying system is a highly efficient and individually adaptable modular system to dry wood shavings and wood chips with low-caloric heat. The drying aims at increasing the calorific value and creating ideal general conditions for the direct firing of wood chips and the processing of wood shavings to high-quality wood pellets.
The wood shavings or chips from woodworking are directly fed into the drier by conveying systems. The product is placed onto the drying belt lying underneath by means of a feeding hopper and a distribution unit and is distributed evenly by means of a dosing screw. The product layer is adapted to the specific drying parameters of the product by a height adjustment and brought into the dryer tunnel.
A hot airflow ventilates the product layer and dries the wet product continuously. This kind of convective drying treats the product with extreme care, as it is heated up only insignificantly primarily during the first drying step.
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