Application: Batch tests to study the feasibility of fluid bed drying, heating and cooling and to obtain basic design data for industrial plant design.
Capacity: The evaporative capacity is 0.1-3 kg/h and the minimum feed requirement is about 1 kg.
Specification: The up to 200 kg/h of drying air is heated electrically to an inlet temperature of maximum 250°C. The fluidization gas(s) is dry air or nitrogen.
The elutriated fines are recovered in a cyclone.
Automatic data collection on computer is available.
Fluid bed processing allows operators to dry, cool, agglomerate, granulate and coat particulate matter, and is ideal for processing a wide range of heat sensitive and non-heat sensitive products.
This type of processing creates uniform conditions by passing a gas (usually air) through a layer of product under controlled velocity conditions.
Heat for the product in fluidized state can either be supplied by the fluidized gas or by heating surfaces (panels or tubes) within the fluidized layer.
In the cases of fluidized cooling, cold gas (usually ambient or conditioned air) is used. Conditioning of the gas might be needed in order to achieve enough product cooling in an economically-sized plant and to prevent pick-up of volatiles. Heat can also be removed by cooling surfaces within the fluidized layer.
Agglomeration and granulation can be done various ways, depending on the type of feed to be processed and the desired product properties.
Fluid bed coating of powders, granules or tablets involves the spraying of liquid onto the fluidized layer under strictly controlled conditions.
GEA Niro offers an extensive range of systems for fluid bed processing, including continuous and batch systems for agglomeration and granulation that are designed to operate in open cycle (involving water evaporation) or closed cycle (involving mostly organic solvent evaporation).
For products that pose a risk of dust explosion, pressure shock resistant designs, self-inertized and closed-cycle systems are available.