Fluidized bed dryer (FBD): Principle, Working, Troubleshooting, and Components Fluidized bed dryer (also known as fluid bed dryers) are commonly used in the pharmaceutical industry to reduce the moisture content of pharmaceutical particles and granules.
Principle FBD (fluidized Bed dryer) works on the fluidization principle. A high-pressure Hot air from the supply is passed through the perforated container containing a wet mass of the granules, after some time granules, particles started to suspend in the air to become dry (called (fluidized state), the process is called fluidization.
Working of Fluidized bed dryer Hot air is injected at high pressure through a perforated bed of moist solid particles to get a velocity greater than the settling velocity of the particles in the fluidization process. The moist solids are raised from the bottom of the bucket and suspended in an air stream (fluidized state). the hot air around the solid particles reduces the moisture content of the particles to achieve the desired drying, also refer as a loss on drying (LOD). The drying vapors carry the vaporized liquid away. Leaving gas is sometimes somewhat recycled to preserve energy.