Flash Dryer

With just single operation, the dryer provides homogeneous mixing, heat transfer, and mass transfer to dry a solid. The residence time in the dryer is usually less than three seconds, producing almost immediate surface drying. It is due to the rapid drying process, these are suitable for diffusion-controlled drying processes.

Feeds used are:

• Moist, powdery, granular, or crystallized
• Wet solids discharged from centrifuges, rotary filters, and filter presses
• mall in particle size
• Reasonably dry, friable, and not sticky

Advantages :

• Relatively simple in operation
• Take little space
• Generally require lower capital investment than other types of dryers
• Excellent choice for processing heat-sensitive or easily oxidized feed materials
• Product inventory in the flash-drying system is very low
• Easy to change product or product grade with minimum downtime
• Control of the flash-drying process is very simple
• Control system responds very quickly to operational changes

Design Considerations :

• The flash drying systems are designed based on feed and product characteristics, which include permissible heating source, and operational safety requirements
• Can be designed in a closed-cycle arrangement, making it suitable for evaporation of organic solvents rather than water
• The drying gas is inert (typically nitrogen), and the solvent evaporated in the flash dryer is subsequently condensed