Stelter & Brinck Blog

Fluid Bed Dryers

The fourth and final type of dryer that we will discuss that utilizes air heaters is a fluid bed dryer (or fluidized bed dryer). According to Wikipedia:

“A fluidized bed is formed when a quantity of a solid particulate substance (usually present in a holding vessel) is placed under appropriate conditions to cause the solid/fluid mixture to behave as a fluid. This is usually achieved by the introduction of pressurized fluid through the particulate medium. This results in the medium then having many properties and characteristics of normal fluids; such as the ability to free-flow under gravity, or to be pumped using fluid type technologies.”

Fluid bed dryers are used across all industries, in order to dry bulk materials that do not vary much in size; cement, clay, pigments, and powders are a few of the products dried with fluid beds dryers. The hot air, generated by either a direct fired air heater or indirect air heater, is passed through the bed of particles at a velocity high enough to suspended them and make them flow as if they are fluid. As you can see from the image below, once the product is sent through the fluid bed, the dust is sent through the outlet duct and to a filter, while the end product is discharged after being sent through the fluid bed.

Fluid Bed Dryer with Air Heater

Fluid Bed Dryer Diagram*

*Fluid Bed Dryer Diagram Image take from “Best Practice Manual-Dryers” 

If you have questions about Stelter & Brinck’s direct or indirect fired air heaters for use with industrial dryers, or for any other application, feel free to contact us!

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