HP Nozzle Atomation

High Pressure Nozzle Atomisation
In applications where the concentrated liquid to be sprayed in the dryer is homogeneous and constant in solids / viscosity, usually it is preferred to apply nozzle atomisers.
This has the advantage of:
• Better control of particle size
• Less fines and better flow / wetting properties
• Lower free fat generations
• Better control in agglomeration
• More options with air / powder flow in the dryer

Equipment Requirements
For nozzle atomisers it is required to have a product feed at high pressure (100 - 200 bar) with accurate control of flow. This high pressure pump can also homogenize the product before feeding the nozzles.

On bigger spray dryers the atomisation will take place with 3 - 10 nozzles.

The internal orientation of these nozzles should be flexible to optimise atomisation in the incoming hot air, and / or to control agglomeration with the return of powder fines.

The feeding tubes for the nozzles and fines return, as well as the insert ring in the dryer roof, need to be protected from the hot air inlet, requiring a lay-out so that they are kept separate each with a limited inlet of fresh air.

High pressure nozzle insert