With its experience and target-oriented development of process solutions in their own pilot plants, ANDRITZ is able to provide you with the optimum solution for your process. No matter whether the best type of fluid bed is static, vibrating, high-temperature, or a unit with built-in heat exchangers, feeding or processing devices: ANDRITZ has them all and will find the best set-up for your particular requirements. A wide variety of design features, such as air distribution plates and different types of heat exchangers, enables ANDRITZ to put together the ideal fluid bed for your application.
Fluid bed dryers are available for various industries, from the environment to biomass, to food and animal feed, and on to minerals and chemicals.
Depending on your requirements, we can handle particle size from 50 μm to 10 mm, with a fluidized area from 0.2 to 100 m².
The most basic type of fluid bed comes with a static housing and without internal heat exchangers. Heating or cooling is performed by convection from the fluidization gas, and product transport through the unit is provided by the hydraulic like characteristic of the fluidized layer.
Although our typical design comes with a rectangular footprint, we can also supply a round design for special applications, for example high supply gas temperatures or increased operating pressures.
Fluid bed dryer/cooler DDC for salt
Fluid bed dryer/cooler VDC for sodium sulfate
Vibrating fluid beds are used for handling products with poorer fluidization properties. Vibration together with directed or non-directed gas flow provides an optimized process for gentle drying with controlled residence time.
Our vibrating units are also available in pressure-shock resistant and sanitary design.
Spray granulator SGS for calcium chloride
Fluid bed dryer/cooler HDC for PVC
Each ANDRITZ fluid bed system is fully customized to clients‘ requirements
The use of internal heat exchangers inside the fluidized layer was an important step for fluid bed technology, allowing high-performance drying and cooling in one unit. The combined use of convection and conduction allows large amounts of heat to be transferred in a compact set-up. It also makes fluidization and heat input independent of one another.
Due to the reduced amounts of fluidizing gas, the auxiliary equipment required for gas treatment is much smaller. Systems efficiency is improved because there are less exhaust gas losses. The static system set-up also allows the unit to be run in a closed loop under inert conditions with highest safety standards.
Whenever it is reasonable or necessary to start thermal drying from a liquid phase, spray granulation is the first choice. The liquid feed material is atomized in suitable nozzles and sprayed onto the surface of the granules inside the bed. As the liquid
phase evaporates, the granules grow in layers, like an onion. The result is a stable and spherical granulate with controlled properties like shape, density, hardness, and particle size.
