Rail-Mounted Fluid Bed Dryer Provides Easy Internal Bag Access

Rail-Mounted Fluid Bed Dryer Provides Easy Internal Bag Access
Vibrating fluid bed dryers and coolers from The Witte Co.

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Vibrating fluid bed dryers and coolers from The Witte Co. are available mounted on rails, providing unobstructed access for cleaning, maintenance and visual inspection. During washdowns or product changeovers, the entire drying and cooling sections spanning the length of the thermal processing system can be rolled out by one person and rolled back into place without tools. The steel rails include cushioned bumpers and are mounted into the floor during installation.

“The primary reason for the rail-mounted dryer is to have a dryer with an integral bag collector directly over the fluid bed,” says Larry Stoma, design engineer for Witte. “The dryer rolls out from under the bag collector and exposes the inside of the dryer and bag collector for maintenance and cleaning.”

Because fines remain inside the bag collector and nothing goes out of the exhaust, it’s possible to exhaust the air directly into the plant, eliminating the need for an outside or separate exhaust.

The self-contained system also eliminates the need for a remote dust collector with explosion protection for carbon-based materials, Stoma says. “You don’t have to protect duct work. You don’t have to protect a separate collector. Typically we would provide a single suppression system for the dryer and collector.

“As we are not concerned about dust being entrained in the exhaust, we can use higher air velocities, which result in a smaller dryer footprint,” he says. “This means lower initial cost and improved drying efficiency.”

Dryers range in size from 12 inches wide by 6 feet long to 48 inches wide by 24 feet long. Drying capacity depends on moisture content of the product. “If you’re talking about a high, 30 percent content, like you might see in a filter tank from sludge, you’re looking at about 10,000 pounds an hour,” Stoma says. “Of course, the lower amount of moisture in the product, the smaller the dryer needs to be.”

Moisture content can be reduced to one-tenth of a percent, depending on dryer size, heat used and amount of moisture in the original material.

Because of its smaller footprint, the fluid bed dyer can be used as a replacement for a conventional dryer. “[But] it’s not something that you add to an existing dryer because the design is different,” he says.

“The unique feature of the dryer is mobility. It provides quick and easy access to the interior. You simply undo a Velcro section and roll it out.”

Other than changing the bag filters each year, the dryer requires little maintenance, Stoma says. “Basically, the only other maintenance would be replacing the oil in the vibrators and checking the condition of the drive belts.” 908/689-6500; www.witte.com.


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