Working principle of blade dryer

NegotiableUpdate on 05/13

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Nature of the Manufacturer: Producers

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Overview

The working principle of the blade dryer is that it has a wide adaptability to materials and the product dries evenly. The overflow weir is installed inside the dryer, and the sludge blade dryer produced by Changzhou Fengneng Drying can adjust the material retention in the dryer according to the material properties and drying conditions.

Product Details

Working principle of blade dryerThe thermal efficiency can reach up to 80% -90%, with a high heat transfer coefficient and water evaporation capacity; The blade structure is special, with a large heating area, a small unit volume, and a small footprint; Can be operated continuously or intermittently; It can be dried under normal pressure, vacuum dried for thermosensitive materials, heated for evaporation, or cooled for crystallization; It can be used as a pre drying for secondary drying, and the solvent can be recovered during the drying process. Both organic and inorganic materials, particulate materials, viscous materials, and materials with high or low moisture content can be dried. The new hollow blade dryer has been successfully used in fields such as food, chemical, petrochemical, dye, and industrial sludge, completing operations such as drying, solvent recovery, cooling, heating and melting, low-temperature combustion, reaction, and sterilization.

Working principle of blade dryer：

Wedge shaped hollow blades are densely arranged on the hollow shaft, and the heat medium flows through the blades through the hollow shaft. The heat transfer area within a unit effective volume is large, and the temperature of the heat medium ranges from -40 ℃ to 320 ℃. It can be steam or liquid, such as hot water, thermal oil, etc. Indirect conduction heating does not carry away heat with air, and the heat is used to heat the material. The heat loss is only the heat dissipation to the environment through the insulation layer of the device body. The wedge-shaped blade heat transfer surface has self-cleaning function. The relative motion between the material particles and the wedge-shaped surface produces a scrubbing effect, which can wash away the attached material on the wedge-shaped surface and maintain a clean heat transfer surface during operation. The shell of the blade dryer is Ω - shaped, and generally two to four hollow mixing shafts are arranged inside the shell. The shell has sealed end caps and upper caps to prevent material dust leakage and fully exert its function.

Product Features of Changzhou Paddle Drying Machine:

1. The Changzhou paddle dryer equipment has a compact structure and occupies a small area. According to the equipment structure, the heat required for the sludge blade dryer produced by Changzhou Fengneng Drying is mainly provided by many hollow blade walls densely arranged on the hollow shaft, while the heat transfer from the jacket wall only accounts for a small part. So the heat transfer surface of the unit volume equipment is large, which can save the equipment footprint and reduce infrastructure investment.

2. High heat utilization efficiency. The heat required for drying is not provided by hot gas, reducing the heat loss carried away by hot gas. Due to the compact structure of the equipment and fewer auxiliary devices, the heat dissipation loss is also reduced. The heat utilization rate can reach 80% -90%.

3. Wedge shaped blades have self-cleaning ability, which can improve the heat transfer effect of the blades. The dispersing force generated by the combined motion of the inclined surface of the rotating blade and the particle or powder layer makes it easy for the material attached to the heating slope to be automatically removed, thus maintaining the efficient heat transfer function of the blade. In addition, due to the reverse rotation of the two shaft blades, the material on the inclined surface is alternately compressed in sections (when the two shaft blade slopes are close to each other) and expanded (when the two shaft blade surfaces are far apart), causing the material near the heat transfer surface to be vigorously stirred and improving the heat transfer effect. The wedge-shaped blade agitator dryer produced by Changzhou Fengneng Drying has a high heat transfer coefficient of 85-350W/(M2 · K)

4. The amount of gas used is small, and some auxiliary equipment can be reduced or omitted accordingly. Due to the absence of gas heating, the amount of gas used during the drying process is greatly reduced. Using a wedge-shaped blade dryer only requires a small amount of gas to carry the evaporated moisture, with minimal gas usage, and only needs to meet the requirement that the drying system does not condense dew under the drying operating temperature conditions. Due to the low gas consumption and low gas flow rate in the dryer, there is less dust carried out by the gas. After drying, the recovery of gas dust in the system is convenient, and the size of the cyclone separator can be reduced, eliminating or shrinking the bag filter. The scale of gas heaters, blowers, etc. can be reduced to save equipment investment.

5. Changzhou paddle dryer has a wide adaptability to materials and uniform drying of products. The overflow weir is installed inside the dryer, and the sludge blade dryer produced by Changzhou Fengneng Drying can adjust the material retention in the dryer according to the material properties and drying conditions. It can increase the retention time of materials in the dryer to 70% -80% of the cylinder volume, in order to meet the drying requirements of difficult to dry materials and high moisture materials. In addition, the feeding speed, shaft speed, and thermal carrier temperature can be adjusted, and the material residence time can be arbitrarily selected between a few minutes and a few hours. Therefore, it is applicable to both easy to dry and difficult to dry materials. The moisture content is only 0.1%, and there are already industrial application examples. In addition, although there are many stirring blades in the dryer to mix the materials evenly, the flow of materials from the feeding port to the discharging port in the dryer is basically a piston flow, with a narrow residence time distribution and uniform product drying.