Propeller Dryer, a horizontal agitated dryer primarily using heat conduction, named for its hollow propeller-like impeller blades. This dryer has a long history of research and development abroad, with two-axis and four-axis structures and a range of specifications in its product series. Developed successfully in Germany, it was later introduced and technically improved in Japan, further expanding to include two-axis and four-axis structures with over a dozen specifications in its product line.
The unique feature of the paddle dryer lies in the fact that the heat required for the drying process is mainly supplied by indirect heating through heat conduction. This design greatly reduces heat loss caused by the gas carrying away moisture, enhancing the utilization of heat. As a result, the hollow paddle dryer has become an energy-saving drying equipment. It is suitable for drying granular and powdered materials, and can also effectively dry paste-like substances.
The paddle dryer operates primarily based on the principle of heat conduction. Its main structure consists of a W-shaped shell with jackets, inside which are paired hollow low-speed rotating hollow shafts, equipped with several stirring blades. Both the jackets and the hollow stirring blades are passed through a heat carrier, heating the material from two heating surfaces simultaneously. The heat carrier is typically introduced into the center of the dryer, passes over the surface of the material layer in a stirring state, and then排出 from the other side.
It's worth noting that the hollow shaft is densely packed with trapezoidal hollow blades, allowing the heat medium to flow through the blades via the hollow shaft. This design features a large heat transfer area within the effective volume, enabling the heat medium temperature to range from -40°C to 320°C, which can be steam, as well as liquids such as hot water or thermal oil. By means of indirect conduction heating, the heat is not carried away by air but is entirely utilized for heating the material. Heat loss is only due to the heat dissipated through the insulation layer of the vessel to the environment.
In addition, the wedge-shaped paddle blades feature an auto-cleaning surface. During the movement of materials, the relative motion between the material particles and the wedge-shaped surface generates a scrubbing effect, which automatically cleans off the adhered materials on the wedge-shaped surface, maintaining a clean heat transfer surface throughout the movement. This auto-cleaning function further enhances the efficiency and reliability of the paddle blade dryer.
In summary, the blade dryer stands out for its high efficiency and energy-saving features, along with its wide application in various material drying processes. It offers an ideal solution for drying needs across industries. Whether in industrial or agricultural production, the blade dryer demonstrates its performance and practicality, making significant contributions to enhancing production efficiency and product quality.
