New Fluidized Bed Dryer for Suspensions and Solutions Eliminates the Need for Grinding

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NARA Machinery Co. Ltd. Zweigndl. EUROPA

The very large surface area of the beads and the movement of the fluidized bed lead to very high rates of heat and mass transfer between the three phases, and so to very quick and effective drying. Tests have shown that the Media Slurry Dryer can produce volumetric heat transfer coefficients above 2.4 kW/(m³K). As a result, a Media Slurry Dryer is up to 20 times smaller than a spray dryer with the same throughput.

The fact that there are no rotating parts and no protruding devices inside the Media Slurry Dryer makes disassembly, cleaning and maintenance very easy.

Another major advantage of the Media Slurry Dryer compared to spray dryers is based on the former’s ability to dry viscous slurries (viscosities up to 10 Pas). This is due to the fact that unlike a spray dryer, the Media Slurry Dryer does not require a spray nozzle or atomizer, which is vulnerable to blocking when used with viscous materials. Instead, as we have seen, the slurry disperses simply through the motion of the beads within the fluidized bed. The table shows typical applications.

The Media Slurry Dryer is available in a wide range of sizes. Evaporation capacities of 2–1,450 kg/h water and fluidized bed surface areas ranging from a few square centimeters to several square meters are in use.

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