Overview:Product DescriptionsSpray cooling (alternatively spray congealing) is defined as a process by which a melt is formed into particles of spherical shape by spraying the melt into a cooling chamber through which ambient or cooled, low temperature air is …
Product Descriptions
Spray cooling (alternatively spray congealing) is defined as a process by which a melt is formed into particles of spherical shape by spraying the melt into a cooling chamber through which ambient or cooled, low temperature air is passing. Rotary (wheel) atomizers and nozzles are used to spray the melt. Spray cooling finds applications in the chemical, food, and pharmaceutical industries. It is a most convenient method of transforming melted feedstocks into free-flowing particulates of controlled particle size。
Importance of Melt Properties
Products that form melts have a solidification curve. When a spray of melt droplets contacts a cool air environment, the melt cools to a solidification temperature. Congealing then takes place at a constant temperature during release of the product’s heat of solidification. Once no longer in a fluid state the droplets further cool to give stable solid particulate forms.
Fine Particle Products
Atomization of the melt is best conducted with a high speed rotary atomizer in a co-current conical based cooling chamber of relatively small diameter. The majority of product is collected directly from the chamber base. The finest particles are recovered in cyclones.
Mean size 50-150 micron
Coarse Particle Products
Atomization of the melt is best conducted with a single fluid pressure nozzle located in the spray chamber cone to spray upwards into the cooling air entering through a roof mounted air disperser. The trajectory of product in a fountain-like manner enables a coarser grade of melt droplet to be solidified in cooling chambers of relatively small volume.
Mean size 150-300 micron
Extra Coarse Particle Products
Atomization of the melt is conducted by using a low speed rotary atomizer in cooling chambers of large diameter. Although conical base chambers are suitable, flat-based designs are often recommended to reduce building height and simplify chamber support requirements. A rotating device sweeps the chamber floor directing the cooled product to a side discharge point or into the central exhaust air duct for recovery in cyclones.
Mean size 300-1000 ¦Ìm.
Feature
A. can produce the appearance of fine spherical particles.
a) particle neat and tidy appearance
b) a narrow particle size distribution
c) particle can not afford to powder, low dust
B.can produce highly liquid, mechanical strength, difficult to damage the particles.
a) in the feed, feeding, batching, mixing, metering and packaging easier to achieve continuity, automation and reduce the labor force.
b) improve the solubility
c) improve the working environment
C.operation of this device is simple to automate operation and maintenance simple.
D.of combination between the use of equipment, no one can do a continuous operation.
E.of the device most suitable for large volume continuous granulation.
F.The device is vertical, can be set in the outdoors, an area of less.
Product Applications
Organic industry：
1. higher fatty acids (stearic acid, etc.)
2. PVC stability (lead stearate, cadmium stearate, zinc stearate, etc.)
3. fat people, a glycerol
4. petrochemicals (paraffin, etc.)
5. synthetic resin (phenol resin, petroleum resin, bisphenol A, etc.)
6.aromatic (asphalt, tar, water terephthalic acid, terephthalic acid, anhydrous maleic acid)
7.fertilizers (urea, nitric acid, etc.)
8.different section of the rings (caprolactam, etc.)
Inorganic industry：
9.sodium hydroxide (caustic soda), sulfur, calcium chloride
