FLASH DYERS PROCESS
Flash Dryers are simple yet versatile in their design. Flash Dryers can be used for drying a variety of products,
usually filter cakes. Slurries, when preconditioned, will also dry well on Flash Dryers.
In a Flash Dryer wet material is dispersed into the drying air stream via one of many types of feeding devices.
Drying takes place in a matter of seconds as heat is transferred from the airstream to the particle
Flash dryers only remove moisture from the surface so the speed of drying is constant throughout the drying phase.
Once dried the product is separated from the airstream by using high efficiency cyclones or in the case of fine products, a bag filter.
Secondary air cleaning devices such as wet scrubbers or thermal oxidizers guarantee the mandatory emission levels required for permitting.
Flash Dryers can be designed with inlet temperatures as high as 1470° F (800°C).
RING DRYERS PROCESS
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, this type of 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.
STEAM DRYERS PROCESS
A Steam Dryer is a closed circuit Air Dispersion Dryer which creates steam from the evaporated water. The steam is discharged from the system at pressures as high as 4 barg and can be used for various heat recovery purposes.
These technologies are used in situations where heat recovery is at a premium and a standard Ring or Flash Dryer is the technology of choice.
Both of these technologies include the following advantages:
High operating wet bulbs for heat recovery
Integrated thermal oxidizers
Safe steam drying environment