The hollow shaft is densely arranged with wedge-shaped hollow blades, and the heat medium flows through the blades through the hollow shaft. The heat transfer area per unit of effective volume is large, and the temperature of the heat medium ranges from -40 degree to 320 degree , which can be water vapor or liquid: such as hot water, heat transfer oil, etc. Indirect conduction heating, no air is carried to take away the heat, 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 body. The heat transfer surface of the wedge-shaped blade has a self-cleaning function. The relative movement of the material particles and the wedge surface produces a scrubbing effect, which can wash off the materials attached to the wedge surface, so that the heat transfer surface is kept clean during operation. The shell of the paddle dryer is Ω type, and two to four hollow stirring shafts are generally arranged in the shell. The shell has a sealed end cover and an upper cover to prevent material dust from leaking out and play a full role.
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The blade dryer has been successfully used in food, chemical, petrochemical, dye, industrial sludge and other fields. The characteristics of heat transfer, cooling and stirring of the equipment make it possible to complete the following unit operations: combustion (low temperature), cooling, drying (solvent recovery) heating (melting), reaction and sterilization. The stirring blade is also the heat transfer surface, which increases the heat transfer area per unit of effective volume and shortens the processing time. The heat transfer surface of the wedge-shaped blade has self-cleaning function. Compression-expansion stirring function makes the material mix evenly. The material moves in a "plug flow" along the axial direction. In the axial range, the temperature, humidity and mixing degree gradient of the material is very small. Using heat transfer oil as heat medium blade dryer can complete low temperature combustion work.
