Paddle dryer is an indirect -heating drying equipment, it is suitable to dry good stable materials
such as paste, powder, granule and sludge. It is capable of drying material with high moisture
and high viscosity. It is characterized by the hollow rotating shafts and the hollow jacket.
Copper oxide sludge is a kind of black cake type which is a bit sticky. We copper sludge is fed
into the dryer through a screw feeder, and then is heated in the drying chamber in a high
heating efficiency. Dry sludge is very fine powder and discharged through the airlock valve
under the dryer. Evaporated moisture is taken out of the paddle dryer for dust collection in a
bag filter.
Structure of hollow stirring blade Inside of Paddle dryer
Applications:
1. For drying or cooling powder, small granule, filter cake and slurry materials; particularly
good at drying sticky heat sensitive slurry materials continuously.
2. Heating area: 1-200m2
3. The drying chamber can be vacuum and normal pressure.
4. Heat supply can be steam, hot water and hot oil.
Features:
1. Dryer size is minimized, due to the large heat transfer area per volume.
2. The wedge shaped paddles goes into the powder to enhance contact to the heat
transfer area, and the heat transfer coefficient is relatively high due to the good mixing.
So, high heating factor can be obtained. Also, the fullness of the materials is high as 80-
90%, therefore large heat transfer area can be efficiently used.
3. Since two shafts overlap each other, it prevents the adhesion of powder on the paddle
wings, therefore keeping a good heat transfer.
4. The residence time distribution is sharp and the powder is uniformly dried.Since the
required carrier gas amount is small, the exhaust gas treatment system can also be
minimized. This is a big advantage, especially for the closed system with inert gas
circulation for solvent recovery.
5. Slurry with high moisture content or materials with high viscosity can be
treated.Available under
the vacuumed condition as well, for materials which are sensitive to high temperatures.
6. By using oil for the heat medium, it is possible to use high temperature up to 290℃.
7. Drying and cooling can be done in one unit.
Technical advantages:
1. High heat efficiency: The drying chamber is insulated by 50mm mineral wool and there is
very little heat loss via the exhaust gas. The heat efficiency can reach 90%.
2. Uniform drying: The specially designed wedge-shaped paddle can completely mix and
stir the wet material to achieve very uniform heating. So the drying is very uniform.
3. Continuous operation: Thanks to pneumatic ball valves for feeding and discharging
under vacuum condition and the rotating paddles which can push the material forward,
the drying process can be automatically and continuously.
4. High evaporating rate: Under vacuum condition, the boiling point of moisture will be
much lower as well as complete and uniform heat transfer, the evaporation rate is much
higher than normal paddle dryer.
5. Compact size: The drying chamber is very compact in size. Only need small installation
space.
6. Environment friendly: The evaporated moisture can be recovered by the condenser and
buffer tank. The exhaust gas is from the vacuum pump is very little compared to normal
dryer.
Operation Principles:
1. Atmospheric Drying Process:
1. Exhaust Blower 2. Precipitator 3. Mainframe 4. Air Filter 5. Heat Exchanger
2. Solvent Recovery Drying Process
1. Mainframe 2. Precipitator 3. Condenser 4. Solvent Recovery Tank 5. Vacuum Pump
6. Vacuum Feeder Valve 7. Discharge Valve
Technical Parameters
Paddle dryer is an indirect -heating drying equipment, it is suitable to dry good stable materials
such as paste, powder, granule and sludge. It is capable of drying material with high moisture
and high viscosity. It is characterized by the hollow rotating shafts and the hollow jacket.
Copper oxide sludge is a kind of black cake type which is a bit sticky. We copper sludge is fed
into the dryer through a screw feeder, and then is heated in the drying chamber in a high
heating efficiency. Dry sludge is very fine powder and discharged through the airlock valve
under the dryer. Evaporated moisture is taken out of the paddle dryer for dust collection in a
bag filter.
Structure of hollow stirring blade Inside of Paddle dryer
Applications:
1. For drying or cooling powder, small granule, filter cake and slurry materials; particularly
good at drying sticky heat sensitive slurry materials continuously.
2. Heating area: 1-200m2
3. The drying chamber can be vacuum and normal pressure.
4. Heat supply can be steam, hot water and hot oil.
Features:
1. Dryer size is minimized, due to the large heat transfer area per volume.
2. The wedge shaped paddles goes into the powder to enhance contact to the heat
transfer area, and the heat transfer coefficient is relatively high due to the good mixing.
So, high heating factor can be obtained. Also, the fullness of the materials is high as 80-
90%, therefore large heat transfer area can be efficiently used.
3. Since two shafts overlap each other, it prevents the adhesion of powder on the paddle
wings, therefore keeping a good heat transfer.
4. The residence time distribution is sharp and the powder is uniformly dried.Since the
required carrier gas amount is small, the exhaust gas treatment system can also be
minimized. This is a big advantage, especially for the closed system with inert gas
circulation for solvent recovery.
5. Slurry with high moisture content or materials with high viscosity can be
treated.Available under
the vacuumed condition as well, for materials which are sensitive to high temperatures.
6. By using oil for the heat medium, it is possible to use high temperature up to 290℃.
7. Drying and cooling can be done in one unit.
Technical advantages:
1. High heat efficiency: The drying chamber is insulated by 50mm mineral wool and there is
very little heat loss via the exhaust gas. The heat efficiency can reach 90%.
2. Uniform drying: The specially designed wedge-shaped paddle can completely mix and
stir the wet material to achieve very uniform heating. So the drying is very uniform.
3. Continuous operation: Thanks to pneumatic ball valves for feeding and discharging
under vacuum condition and the rotating paddles which can push the material forward,
the drying process can be automatically and continuously.
4. High evaporating rate: Under vacuum condition, the boiling point of moisture will be
much lower as well as complete and uniform heat transfer, the evaporation rate is much
higher than normal paddle dryer.
5. Compact size: The drying chamber is very compact in size. Only need small installation
space.
6. Environment friendly: The evaporated moisture can be recovered by the condenser and
buffer tank. The exhaust gas is from the vacuum pump is very little compared to normal
dryer.
Operation Principles:
1. Atmospheric Drying Process:
1. Exhaust Blower 2. Precipitator 3. Mainframe 4. Air Filter 5. Heat Exchanger
2. Solvent Recovery Drying Process
1. Mainframe 2. Precipitator 3. Condenser 4. Solvent Recovery Tank 5. Vacuum Pump
6. Vacuum Feeder Valve 7. Discharge Valve
Technical Parameters