The working principle of the blade dryer is mainly based on the comprehensive effects of heat conduction, convection, and material mixing. Here is its detailed working principle:
Loading: Firstly, the material to be dried is fed into the working chamber of the blade dryer through the feeding port.
Mixing and flipping: The blade dryer is equipped with one or more rotating shafts inside, and multiple blades are mounted on the shafts. When the rotating shaft rotates, the blades will stir and flip the material, creating a continuous flow of material inside the dryer. This flow helps to ensure sufficient contact between the material and the heat source, thereby improving the drying effect.
Heat transfer: Paddle dryers typically provide heat through external heating sources such as steam, hot air, etc. These heats are conducted to the blades and materials through the walls of the dryer, or directly blown onto the materials by hot air. Hot air or gas transfers heat to the material through contact, causing the moisture in the material to evaporate and achieve the purpose of drying.
Mass transfer: During the process of stirring and flipping, the moisture of the material will transfer from the inside to the surface, and then evaporate from the surface. This process is called mass transfer. By continuous stirring and flipping, the speed of mass transfer can be accelerated, thereby speeding up the drying process.
Exhaust: During the drying process, the moisture in the material gradually evaporates, and the evaporated moisture needs to be promptly discharged to prevent moisture from accumulating inside the dryer. This is usually done through the exhaust port of the dryer to ensure that the humidity in the drying environment is not too high.
In addition, some advanced blade dryers also adopt intelligent control systems that can monitor and adjust parameters such as temperature, humidity, and rotation speed in real-time during the drying process to achieve more accurate drying results.
In summary, the blade dryer achieves uniform and efficient drying of materials through the stirring and flipping of blades, heat conduction, mass transfer, and timely exhaust operation. This type of equipment has a wide range of applications in various industries such as chemical, pharmaceutical, and food.
