Principles of Spray Dryer
Spray Dryer involves converting a liquid into a fine spray and then drying it using hot gas.
This method allows for rapid drying and production of fine powders.
Construction
Atomizer: Converts liquid into fine droplets.
Drying Chamber: Large chamber where hot air dries the droplets.
Heating System: Heats the air entering the drying chamber.
Cyclone Separator: Separates dried particles from the air.
Collection System: Collects dried powder.
Working
Atomization: Liquid is atomized into fine droplets.
Drying: Hot air in the chamber dries the droplets as they fall.
Separation: Dried particles are separated from the air.
Collection: Dried powder is collected for further use.
Uses
Drying milk powder, instant coffee, pharmaceuticals, and chemicals.
Merits
Fast Drying: High drying efficiency.
Quality Control: Produces uniform and high-quality powders.
Continuous Process: Suitable for large-scale production.
Demerits
High Energy Consumption: Requires significant energy input.
Initial Cost: High capital investment.
Complexity: More complex to operate and maintain.