Spray drying involves 3 fundamental processes; liquid atomisation, evaporation and separation/collection of the dried product.

    The material to be dried is sprayed, in the form of small droplets, into a vertical drying chamber. At the same time a large volume of hot gas (air) is fed into the chamber to evaporate the liquid content of the sample. Heat and mass transfer takes place as the dispersed droplets are in direct contact with the hot air. On completion of drying, the hot air and solids are separated.

    Dried product is transferred from the base of the chamber and conveyed to a high efficiency cyclone where the powder and drying gas are separated.

    The ESDT1 series atomising spray nozzle delivers fine atomisation at low pressures and low flow rates. This is advantageous for abrasive and high viscosity liquids. The internal mix nozzle design provides for the gas (air) and liquid to mix internally in the nozzle. Increases or decreases in the gas pressure can control the droplet size.