Sodium Carbonate Hollow Paddle Dryer

products descriptions

Applicable for drying or cooling of paste, particle, powder and slurry state of material, perform the process of drying, cooling, heating, sterilizing, reacting and combustion under low temperature. The special stirring and heating transferring blade, makes high heat transferring efficiency, and provide self-cleaning function. The special chock shaped stirring and heat transferring blade has high heating efficiency and self-cleaning function of the heating transferring surface.

Hollow wedge-shaped blades are concentrated on the hollow shaft. Heat media flow through the blade from the hollow shaft. The heat transferring area in the effective volume is very high. The temperature range of heating media is -40 ℃ to 320 ℃ . It might be steam, or liquid state, such as steam, thermal oil etc. Indirect heating, there's no heat carried out by air. All heat is utilized for to drying the material except the lost of heat insulation layers. The surface of wedge-shaped blade has self-cleaning function. The relative movements of the product particles and the wedge-shaped surface effects cleaning action, this can clean the material attached to the wedge-shaped surface, so to keep the cleanliness of heat transferring surface during working. The shell of hollow blade dryer is Ω-shaped, and 2 or 4 pieces of hollow stirring shaft are usually equipped in the shell. To avoid any leakage of material or to collect material solvent vapor, there is sealed terminal cover and top cover with the shell. The discharge port is provided with a blocking plate to ensure the material level height, so that the heat transfer surface is fully covered by the material and fully display the surface contribution .The heat transferring media flow through the rotation connector, jacket's shell and hollow stirring shaft. To ensure best transfer effect, the hollow stirring shaft adopts different interior structure in accordance with different heating media.

products Principle

The heat transfer surfaces of hollow paddle dryer included paddle,stirring shaft, and wall surface. And the heat transfer area of paddle is the great majority, so the structure of the equipment is compact and heat transfer area of unit volume is high. Stirring and mixing make the material turnover tempestuously so that the material can get high heat transfer coefficient, the occupied area and space is small and the plant capital cost is saved.Because the structure of the paddle is special, during the during period, material will be extruded and loosed, drying strengthened. Loading ratio of drying chamber is high, it can be 80~90%, drying time can be regulated from a few minutes to a few hours by regulating the feeding speed, the rotary speed of the stirring shaft and the loading ratio. And from feeding port to discharging port the movement of material is basically piston motion. Its residence time distribution is narrow, so the moisture of product is uniform. The paddle on the stirring shaft has a certain axial angle, so it can dry material continuously.

products Features

• 1. The heat consumption of paddle dryer is low: No heat carried out by the air because of indirect heating; there's no heat insulation layer with the exterior wall of the dryer. It consumes 1.2 kg of steam to evaporate 1kg of water for to drying slurry state of material.
• 2. Low cost to invest on blade dryer: the Unit effective volume has a large heat transfer surface, so the processing time is shortened. Equipment size is reduced, as would greatly reduce the building area and building space.
• 3. The range of material to be processed is wide: Heat sensitive material and the materials to be processed under high temperature might be processed with different heating media. The normal media are: steam, thermal oil, hot water and chill water. It might be continuous or batch operation, widely used in many areas.
• 4. The pollution is less: Without applying or air entrainment, very few powder is entrained, thus the less material is lost. The solvent evaporated is very few, it easy to be processed. For the material that might cause pollution or the solvent to be recovered, it might adopt sealed circulation.
• 5. The operation cost is low: 1hour/day.operator is enough for normal operation. Low stirring speed and reasonable structure, the worn amount is few, and the maintenance fee is low.
• 6. Steady operation: The material particles fully contact heat transferring surface, because of the special compressing and swell-stirring effect of the chock shaped blade. The gradient (or difference)of the temperature, humidity and mixedness are very small in the different axial area, so to ensure the stability of process.
• 7. Heat indirectly, material can not be polluted.
• 8.Rotary speed of paddle shaft is low, it will not destroy the shape and property of the product.

products parameters

Details Image