Flash Dryers are characterized by short residence time of few seconds. Hence, great care needs to be taken in dispersion of the feed in the drying air, which is generally in the form of cake so that true surface water gets evaporated from the feed . Otherwise, the larger particles in the feed material may require longer drying time than the smaller ones in order to reach the desired moisture content.
The principle of a flash dryer is simple. Very hot air (180°C) is sucked and mixed with the Wet product inside a very long pipe (called the flash pipe) up to 15 meters high and 1 meter in diameter. The Wet product is passing through the pipe very quickly (in a "flash") and is dried to about 10% moisture.
After the flash pipe the now dried Product and remaining air are separated from each other in a very large cyclone. The remaining air which has a temperature of about 65°c is sucked through the ID Fan and blown out of the very exhaust pipe.
Produces free flowing powders in agglomerated or granulated form.
Produces powders having a very low content of small particles (dustless).
Ideal for heat sensitive products as particle temperatures are kept low throughout the drying process.
Drying is completed at low outlet drying temperatures, giving high energy utilization efficiencies.
High drying efficiency and low energy costs.
Direct drying with no initial diluting.
Continuous processing with short drying time.
Low operator overheads and minimum maintenance costs.
Pressure shock-resistant chamber for safe drying of organic products.