Advantages of Spray Drying
The spray dryer design and technology provides the powder producer with the ability to control the powder form through the spray drying process. The GEA Niro spray dryers are designed to produce properties such as particle size, bulk density, moisture content, solubility, dispersibility etc. exactly as desired by the user. The products are applicable to all pumpable products, whether heat or non-heat sensitive.
(Spray Drying - Technical Article)
Please select your area of interest to find the drying product best suited for your needs:
Our spray dryers are versatile and therefore able to meet the requirements of a small or large scale production. Before selecting the design of a spray dryer and type of atomizer, there are several properties to evaluate. These may include the actual liquid to be dried, particle size, destribution and powder quality.
Different techniques:
Co-current Mode: Rotary Atomizer
Atomization is achieved by feeding liquid onto a high speed wheel. The rotary atomizer is placed in the ceiling air disperser and operates with a vaned atomizer wheel for non-abrasive feeds, or with a carbide bushing wheel for abrasive feeds. Other wheel designs are available for special applications. The particle size of the powder produced is controlled through change of wheel speed.
Co-current Mode: Two-fluid Nozzle
Atomization is achieved by using compressed air to atomize the liquid feed. The nozzle is placed close to the outlet of the ceiling air disperser. This arrangement is ideal for heat sensitive feeds and has the added advantage of being able to handle both low and high viscosity liquids. The particle size is controlled by varying the nozzle flow ratio between compressed air and feed.
Fountain Mode: Two-fluid
Nozzle or Pressure Nozzle? The nozzle is placed in the conical section of the drying chamber, spraying upwards into hot air entering the drying chamber through the ceiling air disperser. The fountain mode has the advantage of spray drying higher solid feeds and producing coarser powders. Selection of nozzle type depends on the feed properties and powder specification.
Learn more about spray drying and spray dryer technology from GEA Niro A/S here.
For U.S spray drying inquiries, please visit the Niro Inc website: www.niroinc.com