Spray drying is one of the most widely‑adopted processes in liquid forming and drying industries. It is applicable for producing powdery and granular solid products from raw materials such as solutions, emulsions, suspensions and pastes. Therefore, spray drying serves as an ideal process when finished products need to meet specified requirements on particle size distribution, residual moisture content, bulk density and particle morphology.
Working Principle
Feed liquid is fed under high pressure by a diaphragm pump and atomized into fine droplets. The droplets descend concurrently with hot air stream. Most powder particles are collected from the discharge outlet at the bottom of the tower. Exhaust gas together with fine powder passes through a cyclone separator for separation. Exhaust gas is discharged by an exhaust fan, while fine powder is collected by the receiving hopper installed at the bottom of the cyclone separator. A secondary dust‑removal device can be additionally equipped at the fan outlet.
Technical Parameters
Product Features
● Fast drying speed. Atomization greatly increases the surface area of feed liquid. 95‑98 % moisture can be evaporated instantly in hot air flow within several seconds. It is suitable for drying heat‑sensitive materials.
● Finished products feature good uniformity, flowability and solubility with high purity and superior quality.
● Simplified production process and convenient operation & control. Liquids with moisture content of 40‑60 % (up to 90 % for certain materials) can be dried into powder‑granule products in one step. No further crushing or sieving is required after drying, which reduces working procedures and improves product purity. Particle size, bulk density and moisture content can be adjusted within a certain range by modifying operating conditions for easy control and management.
Product Applications
● Food industry: whole milk powder, casein, cocoa milk powder, milk replacer, egg white (yolk), etc. Oatmeal, chicken extract, instant tea, seasoning meat powder, protein, soybean protein, peanut protein, protein hydrolysate, etc. Corn steep liquor, corn starch, glucose, pectin, maltose, potassium sorbate, pumpkin powder, etc.
● Pharmaceutical industry: Chinese herbal extracts, medicinal gum, yeast, vitamins, antibiotics, amylase, lipase, etc.
● Plastic & resin: AB, ABS emulsion, urea‑formaldehyde resin, phenolic resin, melamine‑urea‑formaldehyde resin, polyethylene, polyvinyl chloride, etc.
● Detergent industry: washing powder, soap powder, soda powder, emulsifier, brightener, phosphate agent, etc.
● Chemical industry: sodium (potassium) fluoride, basic dyes & pigments, dye intermediates, Mn₃O₄, formaldehyde silicic acid, catalysts, sulfate agents, amino acids, white carbon black, etc.
● Ceramics: alumina, tile raw materials, magnesium oxide, talcum powder, etc.