There are three conventional atomization types for spray dryers: the first type of rotary atomization, the second type of pressure type atomization, and the third type of air flow type atomization.
The characteristics of the rotary atomizing spray dryer are:
The production capacity of a single machine is large (the spray volume can reach up to 200t/h), the feed volume is easy to control, the operation flexibility is large, and it is widely used.
The characteristics of the pressure atomization spray dryer are:
Coarse particles can be produced, and maintenance is convenient. Since the nozzle hole is small and easy to block, the feed liquid must be strictly filtered. The nozzle hole is easy to wear and must be made of wear-resistant materials. There is also a new structure of the pressure nozzle, which is called the pressure-air flow nozzle. It is characterized by a pressure nozzle in the center and an airflow nozzle in the surrounding environment gap. The atomization is divided into two stages: the pressure nozzle first forms a liquid film, and the liquid film is atomized by the air flow for the second time to make the droplets finer.
The characteristics of the airflow atomization spray dryer are:
Mainly used in laboratories and intermediate factories. The feed liquid that cannot be atomized by the first two atomizers can be atomized by the air-flow atomizer. High-viscosity paste, paste and filter cake materials can be atomized with a three-fluid nozzle. The disadvantage is that the power consumption is large.
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