Like conventional fluid beds, vibrating fluid beds function by passing a process gas directly through a bed of solids via a perforated plate or another type of fluidizing media. Vibration is added to aid in fluidization of more difficult to fluidize materials. Vibrating fluid beds are well suited for the following applications:
- Processing material that has a wide particle size distribution. Vibration will help to discharge oversize particles that will not fluidize.
- Processing sluggish or sticky materials.
- Processing temperature-sensitive materials. A subfluidized condition can be created to produce plug flow and eliminate burning or discoloration.
- Processing fragile materials. Low amplitude vibration and reduced fluidizing velocity create a gentle bed that causes less degradation.
The media slurry dryer is a cost-effective method in the production of super-fine powders from liquid-phase reaction or wet-grinding operations. High viscosity materials can be pumped directly into the unit without mixing or atomization. Other features include uniform distribution of slurry, high heat capacity coefficients, accelerated drying time for large capacities, and agglomeration is prevented (milling is not required).
Flash dryers are an inexpensive solution to drying powders and granular materials. The dryer can use higher gas temperatures than most other type dryers because the material retention time is very short. A unit is capable of processing high capacities in a relatively small amount of space. A flash dryer often is used as a predryer to expand production capacity on existing lines.
For more information dryers, contact Carrier Vibrating Equipment Inc., Louisville, Ky. Call (502) 969-3171 or visit www.carriervibrating.com.