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Fluid Bed Dryers

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Fluidization is achieved when the solid materials display fluid-like behaviors, such as the ability to flow. As the temperature and pressure rises, evaporation occurs and moisture inside the materials becomes a gas and diffuses with the air. Dehydration can also occur if the materials are dried long enough. Read More…

Fluid Bed Dryers Fluid bed dryers force heated gas through a permeable surface where it comes into direct contact with a bed of solid materials, causing the moisture inside them to evaporate. The wet material rests on the surface of a perforated plate and hot gas - usually air - rises up through the holes.
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Leading Manufacturers

Louisville, KY  |  502-969-3171

Carrier is a manufacturer of high quality dryers in addition to many other related products, including coolers, screens, air knife separators, spiral elevators, feeders & conveyors.

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Carrier Vibrating Equipment, Inc. $$$

De Pere, WI  |  920-336-5715

Dürr Megtec provides customized systems for: regulatory compliance; improvement in working environment and in neighbor relations by reducing odor from industrial processes and helping to reduce greenhouse gas emissions and process energy management.

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Dürr Systems, Inc. $$$

Watertown, WI  |  920-261-8107

Established in 1980, Baker-Rullman Manufacturing, Inc. is a leader in the engineering, design, and fabrication of rotary drum dryers, modular steel bins and hoppers, structural steel, feed and seed mill systems, and custom metalwork. At Baker-Rullman Manufacturing our team of experienced, knowledgeable engineers are ready to get your project off the ground. With more than 30 years of project management experience, we can develop custom designed turn-key solutions to meet your needs!

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Baker-Rullman Manufacturing, Inc. $$$

Green Bay, WI  |  920-468-1000

Since 1951, FEECO has designed and manufactured both direct and indirect rotary dryers for a variety of industries around the world. All dryers are customized to fit the unique processing requirements of the material, with material testing/process development assistance available, in addition to post-sale support including inspections, parts replacement, and more.

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FEECO International, Inc. $$$

Carnegie, PA  |  412-788-9810

For over 125 years, Heyl Patterson has custom-engineered thermal processing solutions that are trusted in dozens of industries worldwide. We specialize in high quality drying equipment, such as Rotary Calciners, Rotary Dryers, Fluid Bed Dryers, Flash Dryers, Disc Dryers, Sludge Dryers, Conduction Dryers and Soil Remediation Units. Our pilot plant testing lab helps determine the best technologies and equipment for any application, and we support our clients for the life of their equipment.

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Heyl Patterson Thermal Processing $$$
placeholder image Carrier Vibrating Equipment, Inc. Dürr Systems, Inc. Baker-Rullman Manufacturing, Inc. FEECO International, Inc. Heyl Patterson Thermal Processing

Fluid bed dryers are used for small particles or materials that are sticky, temperature sensitive or fragile because fluidization can be reached at temperatures lower than the boiling point and is relatively gentle. The material should be relatively uniform in size, shape and moisture content to ensure that all particles are properly and completely dried.

Utilized in the pharmaceutical, agricultural, food and chemical industries for powders and agglomerates, fluid bed dryers are used with pesticides, detergents, pigments, milk powder, yeast, powdered flavorings and more. Depending on the application, the permeable plate can vibrate to achieve fluidization for certain materials while a circulating bed causes the particles to become suspended.

Fluid bed dryers are generally used for industrial-sized batches, and standard capacities contain loads from 30 to 25,000 pounds and range from 24 to 72 inches in diameter.

Fluid bed dryers are made from stainless steel and can be horizontally or vertically oriented depending on the space available. A large rounded tank or rectangular box with multiple intake and output valves contains the permeable surface and holds the materials. The supply hose for the gas is connected at the base of the tank because gas will rise once heated.

Pipes are fitted to transport the product into and out of the tank, and there may be multiple internal chambers in the tank. Once the material has entered the tank, the heated air is released. Heating panels or tubes immersed in the material can also contribute to the rising temperatures. The velocity of the air increases to a point where it exceeds the velocity of gravity of the particles and fluidization occurs.

The particles display fluid-like behavior and every piece of the material shakes and moves, allowing direct contact between the air and the complete outer surface of the material. This prevents clusters from forming and allows each particle to reach the same moisture content and level of dryness. Once fluidization is reached, the product is able to flow through the bed and exit the tank.

Continuous fluid bed dryers allow a constant stream of material to enter the tank as the dried product is removed. This process is much faster than drying material in batches, and some models of fluid bed dryers reach up 99% efficiency.

Fluid Bed Dryer Informational Video