In industrial spray drying, atomizer clogging is a primary driver of unscheduled downtime and process instability. Technical data indicates that for traditional pressure nozzle systems, clogging is most frequently the result of specific feed preparation errors.
Feed Requirements for Traditional Nozzles
Successful operation of conventional nozzle-based dryers depends on maintaining strict control over the physical properties of the feed material. Traditional nozzles utilize precision orifices that require the feed to be entirely free of solid chunks or large particles. Additionally, the feed viscosity must be low enough to pass through the restricted nozzle opening at the system’s required operating pressure. If these parameters are not met, the mechanical design of the nozzle makes it inherently prone to blockages.
Mechanical Alternatives to Restricted Orifices
Pulse Atomization Spray Drying (PASD) provides a different mechanical approach to feed delivery. Instead of the high-pressure pumps and precision orifices found in conventional systems, PASD utilizes gas-dynamic atomization and an “open pipe” feed system. This configuration allows for the processing of viscous slurries and higher-solids feeds that would typically require extensive dilution to function in a traditional nozzle.
Because the liquid is delivered through a straight tube at low pressure (~1 psi) into a high-velocity gas stream, the system bypasses the primary mechanical causes of clogging associated with restricted nozzle geometries. For engineers, this reduces the sensitivity of the drying process to minor variations in feed preparation and formulation.
Are nozzle blockages and feed dilution requirements impacting your plant’s throughput? Determining if a gas-dynamic, open-pipe system can stabilize your specific process requires a technical evaluation of your material kinetics. Contact our engineering team today to discuss a feasibility assessment for your formulation.
