The GEA Barr-Rosin Ring Dryer is a pneumatic type system; a modified flash dryer. The ring dryer was developed to increase the versatility of the flash drying technology and to overcome many of the limitations.
In both Ring and Flash dryers, the wet feed is dispersed into the high velocity venturi section of the system. In this zone, the wet product first comes into contact with the hot drying airstream and the bulk of the evaporation occurs. The product is then dried as it is conveyed up through the drying column.
The presence of a "manifold" or "internal classifier" in the ring drying system is what differentiates it from the flash dryer. The manifold uses the centrifugal effect of an airstream passing around a curve to concentrate the product into a moving layer. The adjustable splitter blades are used to return the heavier, semi-dried material back to the dryer for another pass through the system while the lighter, drier product exits the dryer and gets conveyed to the product collection system.
This selective extension of residence time enables the Ring Dryer to process many materials which were traditionally regarded as difficult to dry in a Flash Dryer. Depending on the specific application, GEA Barr-Rosin offers multiple custom designed system configurations to provide flexibility in design and optimal performance.
The Ring Dryer has been used to dry products in many industries including food, chemical, mineral and plastics. A broad range of feed materials including powders, cakes, granules, flakes, pastes, gels, and slurries can be processed. For slurries, pastes, or sticky materials, our specifically designed feed system allows backmixing of the wet feed with a portion of dry product to produce a suitable conditioned material for feeding into the dryer.
GEA Barr-Rosin can provide Ring Drying systems from pilot scale up to industrial scale operating at 150,000 cfm (250,000 m3/hr). Typical heat sources include natural gas, steam, hot oil, and flue gases.