Perforated Inlet Tray Keeps Moist Material From Clogging In Fluid Bed Dryers

Perforated Inlet Tray Keeps Moist Material From Clogging In Fluid Bed Dryers
Air-sweep inlet tray from The Witte Co.

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The air-sweep inlet tray from The Witte Co. is designed to prevent sludge in the 35 to 50 percent moisture range from clogging in fluid bed dryers. Installed within the in-feed section where material enters the drying system, the tray directs the heated airstream through a series of openings (about 1 mm) in the steel plate that faces downstream and parallel to the in-feed deck. Incoming material immediately begins drying and advances to the primary drying zone, reducing the potential for sticky material to block the in-feed.

“In many instances we handle material that is difficult to feed into our fluid bed dryers because of high moisture content,” says Larry Stoma, design engineer with The Witte Co. “Typically, over the years we’ve had a sloped vibrating plate that the material would land on and be conveyed through vibration into the fluidized bed section. What we did was we took that sloped plate or inlet tray and pierced it so the openings are tangential to the slope of the plate. Then we take air and blow it through the openings.”

As material flows onto the plate, it strikes the high-velocity stream of air bled off from the dryer, and in many instances is carried directly into the fluid bed without touching the tray.

Not designed to handle raw municipal sludge, material with 50 to 75 percent moisture content would require dewatering before being fed into the dryer.

The 12- to 18-inch inlet tray, an option on Witte dryers, can be easily accessed and removed for cleaning. 908/689-6500;


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