Spray Dryer

Principles of Spray Dryer

• Spray drying 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 of Spray Dryer

1. Atomizer: Converts liquid into fine droplets.
2. Drying Chamber: Large chamber where hot air dries the droplets.
3. Heating System: Heats the air entering the drying chamber.
4. Cyclone Separator: Separates dried particles from the air.
5. Collection System: Collects dried powder.

Working of Spray Dryer

1. Atomization: Liquid is atomized into fine droplets.
2. Drying: Hot air in the chamber dries the droplets as they fall.
3. Separation: Dried particles are separated from the air.
4. 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.

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