Fluidized bed drying has gained widespread development for several key advantages:
Due to the large contact area between the material and the drying medium, and the continuous and vigorous stirring of the material within the bed, the heat transfer effect is excellent, with a high heat capacity coefficient of up to (2.3-7.0) × kW/m³·K.
(2) Due to the uniform temperature distribution within the fluidized bed, any localized overheating of the product is avoided, making it particularly suitable for drying heat-sensitive materials.
(3) Continuous operations are possible within the same device, as well as intermittent operations.
(4) The retention time of materials in the dryer can be adjusted as needed, ensuring a stable moisture content in the products.
(5) The drying unit itself does not include mechanical moving parts, thereby keeping the investment costs low and reducing the maintenance workload.
Major drawback:
(1) The particle size of the dried material should be moderate, generally not less than 30um and not greater than 4mm. When drying a mixture of several materials, their specific gravities should be relatively close.
Due to the intense material backmixing in the fluidized bed dryer, the material residence time in a single-stage continuous fluidized bed drying unit is uneven, which may result in undried material being discharged along with the product.
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