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