Flash Dryer / Swirl Flash Dryer
A flash dryer is an industrial drying system that rapidly removes moisture from materials, typically powders, slurries, and small particulate matter, by suspending them in a high-velocity stream of hot air. The material is quickly dried as it's conveyed through the drying duct, making it ideal for heat-sensitive or easily oxidized materials.
The simple Flash Dryer is designed to handle materials that can be suspended directly in air. The drying process usually is completed in 0.5-2 secs, and the final moisture is generally in the constant rate drying zone. Various types of Flash Dryer designs are available based on uniform / non uniform particle size of the feed / product.
The feeding of cake is through specially designed paddle mixer / screw conveyor with/without rotary injector depending on rheology of feed material. For difficult to handle feed materials part of dried powder can be re-cycled. Flash Dryers are suited for filter cakes, semi dried powders.
Key features of flash dryers
Variation: Swirl Flash Dryer / Spin Flash Dryer
If the wet cake is paste or sludge, Swirl-Flash Dryer is the most suited for drying application. The dryer is fitted with a mechanical agitator which helps to disperse the wet cake without any need for back mixing of the dry powder.
The feeding system includes a feed tank with agitator and a screw feeder for feeding into the drying unit. The heart of drying process is cylindrical drying chamber, where the drying air enters the air distributor. The tangential air distributor of special design introduces the air as an intense Swirl flow.
Materials Suitable for Flash / Swirl Flash Dryer
