Spray Dryer Evaporation & Sizing Calculator
Calculate spray dryer water evaporation capacity, dry powder yield, required drying air SCFM, thermal efficiency, and heat duty.
Liquid Feed Slurry / Solution
Drying Air Temperatures
Spray Drying Sizing Results
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
Why is pre-concentration critical before spray drying?
Evaporating water thermally in a spray dryer requires approximately 1,800 to 2,500 BTU per pound of water. In contrast, mechanical vapor recompression (MVR) or multiple-effect evaporators remove water for 150 to 300 BTU per pound—roughly 80-90% cheaper. Maximizing feed solids prior to atomization saves massive fuel expense.
What is the relationship between droplet size and spray dryer chamber height?
Droplets must completely dry to non-sticky powder before striking the chamber walls or bottom cone. Drying time scales with the square of droplet diameter (t ~ d²). Coarse atomization (150-250 microns) produces excellent free-flowing, dust-free granules but requires a tall, wide drying tower with high residence time.
What governs the selection of inlet vs outlet drying air temperatures?
Inlet temperature is capped by heat sensitivity of the product (e.g. 320°F-380°F for milk powder or pharmaceuticals to avoid caramelization/denaturation; up to 900°F for inorganic catalysts or ceramics). Outlet temperature is dictated by the equilibrium relative humidity needed to reach target residual moisture.