NARROWSPAN atomization from Niro A/S
Powder particles of uniform size
Many types of spray dried products would benefit from being coarse with a particle size distribution as close as possible to a uniform-sized distribution, i.e. where all particles would be spheres with identical diameters. Such products would have the advantage of being dust-free (no fines) and of containing no large particles (difficult to dry and to re-dissolve).
Conventional atomization methods
Conventional atomization methods create droplets with a wide size distribution, which in turn form the basis of the normal powder. These methods include rotary atomization, pressure nozzle and two fluid nozzle atomization. A common factor in these methods is the inherent randomness in the creation of the single droplet, resulting in a great variation of powder particle sizes - far form the mentioned "uniform" condition. Obvious advantages of uniform powders would be reduced dust problems and easier plant design, where the absence of large droplets that require longer drying times allow for reduced plant dimensions.
Approaches to uniform size distribution
An approach to making uniform-sized powders is the NARROWSPAN™ atomization principle used by the Niro "W" type atomizers. The narrower particle size distribution obtained with these atomizers shows improved powder properties, including flow-ability, non-dustiness, and wet-ability, previously possible only in plants of considerably larger dimensions.
A profitable replacement
A spray drying plant concept with the NARROWSPAN™ atomization technique may replace the nozzle tower concept in future plants. The advantages include: Significant reduced building height, increased drying capacity, particle size change, flexibility, and a simplified feed system. A dryer adopting the NARROWSPAN™ technique will be able to accept an operation producing powder with increased average particle sizes, due to the reduced occurrence of larger droplets.
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