dedert ring dryers are used when products cannot be efficiently dried in single pass flash dryers. in cases where particular powders, pastes, cakes or slurries require extended drying times, the dedert ring dryer is the solution.
the differentiating technology between the flash dryer and the ring dryer is the incorporation of a classifier (manifold), which enables the recirculation of semi-dried product back to the initial heat zone for additional drying and dispersion. the classifier achieves this by the adjustment of blades which cut into the layer of material that has been centrifugally classified. the splitter blades are adjusted and set by qualified dedert engineers during the commissioning of the ring dryer and need not be adjusted once set.
the recycled material on the ring dryer allows a comparatively lower exhaust temperature to be used while achieving the desired final moisture content. drying efficiency is improved and variations in product quality are limited.
dedert has designed and built the world’s largest partially-closed ring dryer at 179,000 acfm and is able to evaporate 34 tons of water per hour in a single unit.