rotary dryer.pptx
TRANSCRIPT
Rotary DryerKelompok : A.17
Definition..
Rotary dryer is handling by bringing it into direct contact with a heated gas. The dryer is made up of a large, rotating cylindrical tube, the dryer slopes slightly so that the discharge end is lower than the material feed end in order to convey the material through the dryer under.
Aplication of Rotary Dryer
Rotary dryer can dry many kinds of materials which contain moisture, such as coal, coal slurry, slag, industrial waste, and clay stone. Rotary dryer are widely used in building materials, metallurgy, and chemical industry
Working Principle
The wet materials are transported into the material
hopper by the belt conveyor and bucket elevator, and
gets into the feeding terminal through feeding pipe with
the aid of feeder of material hopper. The pitch of the
feeding pipe should be more than the natural pitch of
materials in order to help the materials flow into the
dryer successfully. The cylinder of dryer is a rotary
cylinder which is oblique slightly. The materials are fed
from the relatively higher terminal, heat carrier comes in
from the lower terminal, and sometimes the heat carrier
and materials get into the cylinder together.
Along with the revolving of cylinder, the materials
move to the lower terminal due to the gravity.
When the wet materials move forward, it receives
the heat from the heat carrier directly or indirectly.
As a result, the wet materials are dried, and
discharged out by belt conveyor or screw
conveyor on the outlet. There is shoveling plate
inside the cylinder in order to shovel materials up
and cast it out, to increase the connection surface,
to promote drying efficiency, and accelerate the
forward movement of materials. Generally, the
heat carrier can be hot air and chimney flue
After the heat carrier is dried, the
materials mingled with air should be
collected with cyclone dust collector.
If there is need to reduce the content
of dust mixed with tail gas, the heat
carrier should be subject to bag dust
collector or wet dust collector before
it is discharged.
Advantege of Rotary DryerBetter able to dry the outer layer of a
solid or inGood material handling up to avoid
the occurrence of attritionGood mixing process, ensure that the
occurrence of a uniform material drying / over
High thermal efficiencycontinuous operationEasy installationUsing a bit of electrical power
Disadvantage of Rotary DryerCan cause a reduction in size due
to erosion or breakdownDried product characteristics are
inconsistentLow energy efficiencyCare difficult toolThere is no clear separation of
dust