In the spray-drying process, nozzles atomize the solutions, emulsions or suspensions to be dried into fine droplets. In the cocurrent or countercurrent principle, the drying then takes place with tempered air or inert gas. A cyclone separator then separates the dry particles from the drying air. URACA pumps spray the medium by pressing it through a single-fluid nozzle at a pressure of 50 to 250 bar.
The nozzle is usually located in the upper part of the spray tower, but can also be placed in the bottom of the tower and work much like a fountain. The droplet size is dependent on the surface tension and viscosity of the medium, the diameter of the nozzle opening and the spray pressure. By varying the nozzles and the pump pressure, a flexible adaptation is possible.