Ring Dryers

Feed-Type Ring Dryer

Provides selective residence time and is capable of large evaporative capacities with reduced footprint.

The presence of a single-blade "manifold" or "internal classifier" and it's position in the Feed-Type Ring drying system is what differentiates it from the Flash dryer and other Ring Dryers.

The manifold, which is often used in combination with a pre-separator, uses the centrifugal forces created through passing a product containing airstream around a curve to concentrate the product into a moving layer. The adjustable splitter blade is used to cut this layer and return the heavier, semi-dried material back to the disintegrator which dispersers the feed material into the hot air stream at the inlet of the dryer for another pass through the system while the lighter, drier product exits the manifold and proceeds to the product collection system. The combination of this manifold and disintegrator aids control of particle size, product moisture and exhaust temperature.

This selective extension of residence time enables the Feed-Type Ring Dryer to process many materials which were traditionally regarded as difficult to dry in a Flash Dryer. Depending on the specific application, GEA offers custom designed systems based on proven configurations and technology to provide flexibility in design and optimal performance.

The Feed-Type Ring Dryer has been used to dry products in many industries including agrifood, chemical and mineral. 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 back-mixing of the wet feed with a portion of dry product to produce a suitable conditioned material for feeding into the dryer.


Feed-Type Ring Dryers for DDGS


  • Cold disintegrator with single stage manifold
  • Choice of a buffer hopper or back-mixing system if required
  • Can incorporate a pre-separator to collect the bulk of the material before the cyclones
  • Large evaporative capacities
  • Can be designed for open circuit and partial gas recycle
  • Can be designed for operation in an inert atmosphere


  • The disintegrator breaks lumps and disperser the wet feed and the manifold uses centrifugal forces to promote the recycling of heavier wetter material to the dryer feed point while allowing dry light product to be collected. This combination reduces the exhaust temperature and increases the thermal efficiency of the system while ensuring product quality
  • Flexibility to work with different dewatering systems and to enable use with friable and non-friable wet feeds
  • Improves cyclone collection efficiency and emissions. Especially suited for fibrous and feed products.
  • Improves plant simplicity and capital investment
  • Enables energy savings and system integration
  • Suitable for operation with solvent and recovery thereof.

Process Flow Diagram

Feed-Type Ring Dryer

Feed-Type Ring Dryer

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