Brochure Flash Dryer

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Dryers

SWENSON owns designs which include Spray, Rotary, Fluid-Bed, and Flash Dryers and Coolers. The economics of your particular process along with the characteristics of both the feed and product, will dictate the dryer style and model best suited to your needs.

SWENSON DRYER TYPES

The type of dryer best suited for a particular application depends upon both the feed characteristics and desired product characteristics.

SPRAY DRYER	Used when the feed is a solution or slurry, the product produced is generally a fine powder. Typical applications: PVC slurry, waste water streams, lignin sulfate.
SPRAY CONGEALER	Used when the feed is a melt and a powdered product is desired. Typical applications: waxes and fats.
ROTARY DRYER	Used for fairly free flowing feeds, with a narrow to wide particle size distribution and for both small and large size particles (150 to 12,000 microns). Wet and pasty materials can be dried when the feed is back-mixed with dry product. Air flow can be parallel or counter current to the solids flow. Typical applications: sodium sulfate, sodium carbonate and inorganic chemicals.
ROTARY COOLER	Used to cool hot material discharging from a dryer. Air flow is typically counter current to solids flow.
FLASH DRYER	Used for drying fairly free flowing feeds, with a narrow to wide particle size distribution and for both small and medium size particles. Wet and pasty materials can be dried when the feed is backmixed with dry product. Air flow is parallel to the solids flow. Because of the short retention time in the dryer, higher outlet air temperatures may be required to achieve low product moistures.
FLUID BED DRYER	Used for drying fairly free flowing feeds, with a fairly narrow particle size distribution and medium size particles (250 to 4000 microns). Air flow is perpendicular to solids flow. Fluid bed dryer can be provided with multiple zones to match the drying operating conditions with the material drying characteristics. Internal heating coils can be provided for additional heat input. Typical applications: sodium chloride citric acid and ammonium sulfate crystals.
FLUID BED COOLER	Used for cooling fairly free flowing materials, with a fairly narrow particle size distribution and medium size particles (250 to 4000 microns). Air flow is perpendicular to solids flow. Fluid bed coolers can be provided with internal cooling coils can be provided for additional heat removal. The fluid bed cooler can be the final zone of the fluid bed dryer.

AUXILIARY EQUIPMENT
The following auxiliary equipment is typically provided with the dryers and coolers to provide a completely integrated system:

Air Heater: gas and oil fired, steam coils	Storage Silos and bulk loading stations	Packaging equipment: bulk or bags
Supply and Exhaust Blowers with flow control dampers and vibration isolation	Cyclone collectors with air locks	Wet Scrubber with circulating piping and pumps
Instrumentation and Control Panels	Inlet air filters	Screw and Bucket Conveyors
Screeners	Interconnecting ducts	Feeders: Screw and belt
Bag filters with air locks	Modular Construction

SWENSON dryers have performed successfully in a number of industrial applications. A partial list of materials that have been processed in SWENSON dryers follows:

Industry	Materials
Chemical Industries	Sodium Carbonate Sodium Sulfate Sodium Nitrate Copper Sulfate Sodium Sulfite Calcium Chloride	Swenson DTB crystallizers and 8' diameter x 40' parallel-flow dryer for production of ammonium sulfate and drying system for anhydrous sodium sulfate
Fertilizer Industries	Ammonium Sulfate
Plastic Industry	PVC Catalyst	Swenson Sodium Chlorate Fluid Bed Dryer
Waste Streams	Misc. Waste water Filter Cakes
Food Industries	Coffee Milk Citric Acid Salt

For additional information about SWENSON Dryers or other equipment, please contact our Sales Representatives.