Spray Dryer

Thus, sprayer dryer is a cost-effective method of obtaining powder from heat sensitive liquids like milk while retaining valuable nutrients, aromas and flavors.

Atomization and drying Spray Dryers :

The two drying principles are important for the industry. These include Conical Spray Dryer (CSD) with air extraction at the base of the chamber, and the Triple-A with air extraction at the top of the chamber. Each type are available with the following options:

• Single-stage spray dryers with product outlet at the base.
• Two-stage spray dryers sending product to an external fluid bed dryer and/or cooler.
• Multi-stage spray dryers sending product to an integrated fluid bed, and then into an external fluid bed dryer and/or cooler.

Recirculation of fines :

In the dryers the the recirculation of the fines are led back from the cyclones and/or bag filters to the atomization zone useful for agglomeration. Further, additional drying is done using one or more fluid beds that adds a number of advantages as compared to single-stage spray drying:

• Energy savings due to a high temperature difference in the dryer
• Improved product quality, in particular in heat-sensitive products, due to a more gentle drying process
• Improved agglomeration due to the relatively high moisture content of powder entering the fluid bed
• Higher powder bulk density and lower air content due to lower drying temperature
• Lower powder loss due to reduced powder content in the air