Spin flash dryer is a method for solid fluidization. This flash
dryer is useful for mechanical dispersion and for adjusting the granule size
of high humidity paste type material.
Under the action of hot air and mechanical dispersion, the wet cake appears
granular and gets fluidized. Instantaneous exchange of heat and mass takes
place. The dried materials are taken in the collector as powder products.
The system consists of double shaft screw followed by mono screw to feed
homogenized material into dryer housing at controlled rate. The tangential
entry of air and mechanical action of agitator help to decompose lumps
enabling intimate mixing of hot air with the product, and thus ensuring
drying of the product. The particle classification orifice on the top of
drying chamber allows finer product to pass with exhaust gas to powder
collection system. The flash dryer is useful for drying sticky products, also
effective against viscous materials.
The simple Flash Dryer is designed lo handle materials that can be
suspended directly in air, requiring removal of free moisture. Wet material
is dispersed into a stream of heated air (or gas) which conveys it through a
drying duct. Using the heat from the air stream, the material dries as it is
conveyed. Drying takes place in a matter of seconds, and the final moisture
is generally in the constant rate drying zone. Elevated drying temperatures
can be used with many products since the flashing off of surface moisture
instantly cools the drying gas without appreciably increasing the product
temperature.
Product is separated using cyclone, and/or bag filter. Typically, cyclones
are followed by scrubbers or bag filters for final cleaning of the exhaust
gases to meet current emission requirements.
Application :
Drying for chemicals, Dyes, Bulk Drugs, Minerals and Ceramics.
Spray Dryer is a continuous single stage operation, extensively
used to convert solutions, suspensions, and slurries into dry powder within
a few seconds without any intermediate handling. The drying being very
rapid, the product temperature does not go up markedly. Thus spray drying is
eminently suitable for drying heat sensitive materials.
Industrial spray dryers comprise a large cylindrical chamber, basically vertical in
position in which the material is dried into small droplets. These droplets
are further fed with hot air which is sufficient for supplying the heat for
complete evaporation of liquid. Feed is taken from rotary atomizer or
nozzle.atomizer.
The design description is as follows :
Co-current Type : Feed and hot air come from same side.
Counter Current Type : From top side feed is given and hot air comes from
the bottom side.
Co-counter Type : Here the feed comes from bottom side and hot air flows
through top.
The chamber design comprises following features :
High pressure nozzle on tall tower
Construction in a bustle type format
Provision of Rotary Disc Atomiser
Basic characteristics of our equipment are :
High thermal efficiency
Automatic temperature and feed rate control
Dustless atmosphere
Production of Free flowing product
Production of round, uniform and high purity particles.
Application :
Milk, ceramics, dyes, dyes intermediates, pigments, detergents, herbal and
other natural products extracts, baby food, herbicides, matto dextrin,
silica, yeast, antibiotics, enzymes, etc.
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