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Spray Dryer

GEA Process Engineering Inc.


The new MOBILE MINOR '2000' version has been introduced to meet the still increasing demand for a more flexible, modern and easy-to-handle laboratory dryer having different levels of control systems.

Spray drying is a unique drying process involving both particle formation and drying. The powder characteristics can be controlled and powder properties maintained constant throughout a continuous operation. The selection and operation of the atomizer is of extreme importance in achieving an optimum operation and production of top-quality powders.

In the MOBILE MINOR, small quantities of solutions, suspensions, and emulsions can be dried into representative powder samples. Test results from the MOBILE MINOR provide important information for selecting the design and technical specification of a given drying project.

Three alternative atomizing systems are offered:

  Rotary atomizer, located in the center of the chamber roof. An air turbine drive operating from a sixbar compressed air source, supplies power to the atomizer wheel. A vaned atomizer wheel is used for non-abrasive feeds and an atomizer wheel with carbide bushings for atomizing abrasive feeds. Particles in the range 5-25µm are created.
  Co-current two-fluid nozzle, located also in the center of the chamber roof. The atomization is created by compressed air at a pressure of 0.5-2.0 bar. The feed and atomizing gas are passed separately to the nozzle head where the atomization takes place. Two-fluid nozzles have the advantage of handling more viscous feeds. The co-current mode is selected for drying heat sensitive products to fine particles in the range 5-25µm.

Fountain two-fluid nozzle, located in the cone of the drying chamber, spraying upwards. The fountain mode is selected to meet a more coarse and free-flowing powder specification. Often used for fine ceramics and other non-heat-sensitive products. The countercurrent flow offers a dryer performance with excellent heat utilization and provides the longer powder residence time in the drying chamber required to complete the drying to larger particles in the range 15-80µm.

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