Spray Dryer

Spray dryer takes liquid stream and separates the solute or suspension as solid and the solvent into vapor. The solid is usually collected in a drum or cyclone. The liquid input stream is sprayed through a nozzle into a hot vapor stream and vaporized. Solid particles are formed as moisture quickly leaves the droplets. A nozzle is usually used to make the droplets as small as possible, maximizing heat transfer and the rate of water vaporization. There are two main types of nozzles: high pressure single fluid nozzle (50 to 300 bars) and two-fluid nozzles: one fluid is the liquid to dry and the second is compressed gas (generally air at 1 to 7 bars).

Applications

• Food : milk powder, coffee, tea, eggs, cereal, spices, flavorings, starch and starch derivatives. vitamins, enzymes, colorings.
• Pharmaceutical : antibiotics, medical ingredients, additives.
• Industrial : paint pigments, ceramic materials, catalyst supports, microalgae.