A spray dryer requires a liquid stream and separates the solute, or suspension, into a solid, and the solvent into a vapor. Solids are usually collected in drums or cyclones. The liquid input stream is injected into the hot steam stream and vaporized through the nozzle. Solids form moisture leaving droplets quickly. Nozzles are typically used to keep the droplets as small as possible, maximizing heat transfer and water vaporization rates. Droplet size can range from 20 to 180 microns depending on the nozzle, there are two main types of nozzles: high pressure single fluid nozzles (50 to 300 bar) and dual fluid nozzles: one fluid is liquid dry and the second is compressed Gas (usually air).
Spray dryers can dry products very quickly compared to other methods of drying. They also turn solutions, or slurries, into dry powders in a single step, which can be advantageous for profit maximization and process simplification.
Spray Dryer Application
Foodstuffs: milk powder, coffee, tea, eggs, grains, spices, flavourings, starch and starch derivatives, vitamins, enzymes, stevia, colorants, etc.
Medicine: antibiotics, pharmaceutical ingredients, additives.
Industry: paint pigments, ceramic materials, catalyst carriers, microalgae.
https://www.stardrying.com/
