Þurrkari, rúllubotnsþurrkari (rolling bed)

Allgaier Process Technolgy Trockner WB-T1.00-3.00

The rotary bed dryer WB-T (model 1.00 / 3.00) from Allgaier Process Technology GmbH is a specialized industrial plant for the continuous, uniform, and gentle drying of bulk materials and biomass. In process engineering, the model designation (1.00 / 3.00) typically refers to the dimensions of the drying area, i.e., a bed width of 1.00 meter and a bed length of 3.00 meters.
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The heating capacity is 250 kW and is powered by electricity.

Typical applications:
• Biofuels & wood industry: Drying of wood chips, sawdust, and bark for pellet production.
• Waste management
• Agricultural & recycling industry: Processing of fermentation residues (from biogas plants), green waste, sugar beet pulp, or bagasse.

Operating principle:
The technology combines the process engineering advantages of a drum dryer with those of a fluidized bed dryer:
• Rotary bed mechanism: The wet product lies inside on a perforated flow bed (perforated sheet). A targeted mechanical movement or tumbling in combination with the airflow creates a rotating or rolling product movement ("rotary bed").
• Counter-current or cross-current ventilation: The drying air is blown from below through the sieve bed and flows intensively through the tumbling product. This ensures an optimal heat and mass exchange.

Main features & advantages:
• Low-temperature drying: The plant is ideally designed for operation with waste heat or low-temperature heat sources (e.g., from combined heat and power plants/CHP or industrial residual energy).
• Long residence time: This enables particularly gentle dewatering of the material while simultaneously ensuring high homogeneity of the residual moisture.
• Robust particle processing: In contrast to pure fluidized beds, large, irregular, or sticky particles can also be processed economically.
• Integrated screening: The flow effectively reduces fine dust and sand content during the process.

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