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Dryers, evaporators and concentrators for liquids

ICF & WELKO

  • Dispersion dryer / spray
  • Dispersion dryer / spray
  • Dispersion dryer / spray
  • Dispersion dryer / spray
  • Dispersion dryer / spray

Article: 00042660

Dispersion dryer / spray

Spray drying enables the transformation of feed from a fluid state into a dried particle form by spraying the feed into a hot drying medium. It is a continuous particle drying operation; the inlet product can be a solution, a suspension, a dispersion, an emulsion, a gel. The dried product can be in the form of powders, granules or agglomerates depending on the chemical-physical features of the product, the dryer design and the properties required on the final powder. The spray drying process mainly involves five steps:

Concentration: feeding material is normally concentrated prior to introduction into the spray dryer.
Atomization: the atomization stage creates the optimum condition for evaporation to a dried product having the desired characteristics.
Droplets-air contact: in the drying chamber, atomized liquid is brought into contact with hot gas, resulting in the evaporation of 95% of the water contained in the droplets in a few seconds? time.
Droplets drying: moisture evaporation takes place in two stages:
during the first stage, there is sufficient moisture in the drops to replace the liquid evaporated at the surface and evaporation takes place at a relatively constant rate;
the second stage begins when there is no longer enough moisture to maintain saturated conditions at the droplets surface, causing a dried shell to form at the surface. Therefore, evaporation depends on the diffusion of moisture through the shell, which is increasing in thickness.

Specifications

  • Drying method: dispersion
  • Associated function: spray
  • Applications: for the chemical industry

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