The Fluidized Spray Dryer FSD™ produces an attractive coarse agglomerated,
free-flowing dustless powder. It is a spray dryer that combines spray drying and fluid bed drying technologies. The
Fluidized Spray Dryer FSD™ produces powders/agglomerates with a mean particle
diameter (D50) between 0.1 – 0.4 mm all depending on the product.
Superior product quality
The powder quality from this
type of spray dryer is used as
a benchmark worldwide. It includes dyestuff, agrochemicals, inorganic salts, organic salts, tannins and other products.
All flowsheet animations
are available in the GEA
Niro download area.
Drying in more stages
The FSD™ operates with two or
three drying stages, each adapted to the moisture contents during the drying
process. In the initial drying stage, the concentrate is often atomized by
co-current nozzles placed in the hot drying air duct. The air enters the spray
dryer vertically through the air disperser at high velocity, ensuring optimal
mixing of the atomized droplets with the drying air.
Further drying stages
At high moisture content, the
powder may exhibit thermo plasticity and becomes sticky which helps the
required agglomeration. However, the design and air flow pattern in the FSD™
plant is created in such a way that prevents the particles from sticking to the
walls of the drying chamber, and instead be led directly into the integrated static fluid bed for
second-stage drying. The combined spray drying and fluid bed drying makes the
Fluidized Spray Dryer FSD™ concept very energy efficient.
VIBRO-FLUIDIZER™- final drying and cooling
When the
powder has reached a certain moisture content, it can be discharged into a
VIBRO-FLUIDIZER™ for final drying and subsequent cooling. The drying/cooling
air from the chamber and VIBRO-FLUIDIZER™ is passed through a bag filter to
seperate the fine powder, which is returned back to the atomization device, the
chamber cone (static bed), or the VIBRO-FLUIDIZER™ for optimizing the powder
characteristic. The VIBRO-FLUIDIXER™ can be replaced by our Triple-Bed as is
used in the IFD™ dryer.
Powder from a fluidized spray dryer
Should your demands for degree
of agglomeration and the powder bulk-density not be met by the fines return to
the nozzles alone, the
FSD-GRANULATOR™ can help you consistently produce the
high-quality powders that your customers demands. This patented GEA Niro system
allows additional liquid to be added in the stationary integrated fluid bed – a
feature that is not possible in traditional spray dryers. The liquid may be
water, a liquid with the same composition as the feed, a melt or a solution
containing different substances.
Safety aspects
All GEA Niro spray drying plants comply
with the strictest requirements for health, safety and environmental
compliance. GEA Niro’s expertise in explosion control design is unequaled and
an invaluable aid whether considering ATEX, other European safety directives or
local regulations. All plants designed and supplied by GEA Niro will enable the
end user to obtain approvals put forward by the EU directive.