High Efficiency Fluid Bed Dryer 20-30 Min Per Batch 500kg Round Bed Stirrer

A tray oven needs six to twelve hours to dry a wet granulate; a high efficiency fluid bed dryer finishes the same batch in 20 to 30 minutes. The GFG-500 achieves this by suspending the wet granules in a hot air stream inside a round fluid bed, where every particle is exposed to the drying air at the same time. Because the whole 500 kg batch is fluidized at once instead of drying from the tray surface inward, the moisture gradient across the bed stays flat and the finished granulate is uniform from the top of the batch to the bottom.

Two engineering details separate this high efficiency fluid bed dryer from a basic fluid bed unit. First, the drying chamber is round rather than rectangular, so there is no corner where material can settle and stay wet. Second, a low speed stirrer turns inside the bed at 11 rpm, breaking up the agglomerates that damp granules form on contact and preventing the channelling that lets hot air short circuit through the bed while neighbouring zones stay wet. Together these two features keep the drying curve predictable for sticky, high moisture and fine powders that would otherwise block a conventional fluid bed.

• 20 to 30 Minute Batch Drying: a full 500 kg batch of wet granulate is dried in 20 to 30 minutes at 15 to 90 minutes of total working time, which is 10 to 20 times faster than a hot air circulation oven and releases the drying room for other work.
• Round Bed Without Dead Corner: the circular chamber of this high efficiency fluid bed dryer eliminates the corner zones of a rectangular unit, so no wet pocket survives at the end of the cycle and cleaning is faster.
• 11 rpm Anti Channeling Stirrer: the low speed agitator keeps damp material moving, breaks agglomerates and prevents air channelling, which stabilizes the drying curve for cohesive and high moisture products.
• Antistatic Filter Bag: a top mounted bag filter made of antistatic special fibre retains fines inside the chamber, protects the fan and keeps the working area dust free while the high efficiency fluid bed dryer runs under negative pressure.
• Tilting Discharge: the bowl tips over for discharge, so the dried granulate leaves the high efficiency fluid bed dryer quickly and completely with almost no manual scooping or residual heel.
• GMP Sealed Design: sealed negative pressure operation, polished contact surfaces and an optional automatic charging and discharging arrangement make the unit suitable for pharmaceutical and food production lines.

The high efficiency fluid bed dryer is specified where a wet granulate must be dried fast without a long oven residence time:

1. Tablet and capsule granulate after high shear or fluid bed granulation, dried in the same shift as the granulating step.
2. Pharmaceutical, nutraceutical and veterinary granule where GMP documentation and dust containment are required.
3. Foodstuff granule such as instant drink, soup base, sugar and seasoning, where colour and solubility must be preserved.
4. Chemical and agrochemical granule with residual solvent or surface moisture that must be reduced quickly.
5. Feedstuff and premix granule where a short drying window protects heat sensitive vitamins.

Because the high efficiency fluid bed dryer works under negative pressure, fine dust stays inside the bowl and the filter bag rather than settling on the ceiling and walls, which reduces cleaning labour and protect operators handling potent or irritating compounds.

Why is 20 to 30 minutes enough for a 500 kg batch? In a fluid bed every particle is surrounded by moving hot air, so the surface area available for evaporation is thousands of times larger than in a tray oven. That is why the high efficiency fluid bed dryer removes surface moisture in minutes instead of hours.

What does the 11 rpm stirrer actually do? It keeps damp granules in motion and breaks the agglomerates that form at the start of drying, which prevents air from channelling through a few cracks while the rest of the bed stays wet. The result is an even moisture profile across the whole batch.

Can sticky or high moisture material be dried? Yes, within limits. The round chamber and the stirrer together allow a higher initial moisture than a plain fluid bed, and a pre-mix or back mix step is recommended when the feed is unusually wet or cohesive.

How is the machine cleaned between products? The bowl tilts for discharge and the filter bag lifts out, so the interior can be washed directly. A CIP option and a quick release filter cage are available when the high efficiency fluid bed dryer is used for several products in one week.

The high efficiency fluid bed dryer ships as a main unit plus a separate fan and heater skid, each braced in an export plywood case with the filter bags and control cabinet packed independently. A no load run test, air volume and pressure verification, electrical safety inspection and a material certificate are completed before dispatch. The warranty covers 12 months of operation, and filter bags, stirrer seals, discharge seals and fan bearings are supplied as a two year spare kit together with installation drawings and operator training.