Rotary dryer is a kind of dryer which can process a lot of materials in one step. Due to its reliable running, flexible operation, strong adaptability and large processing volume, the rotary dryer is widely used in metallurgy, building materials, food, light industry, chemical industry, coal, and medicine industry. Working Theory of Rotary Dryer Rotary dryers consist of a horizontally inclined rotating cylinder. Material is fed at one end and discharged at the other end. In direct-type rotary dryers, hot gases move through the cylinder in direct contact with the material, either with or against the direction of its flow. The cylinder is equipped with flights, which lift the material and shower it down through the hot gas stream. Performance and feature The rotary dryer has the advantages of reasonable structure, excellent manufacture, high output, low energy consumption, convenient operation and so on. The rotary dryer is applicable for particle materials, and is also applicable for paste and viscous materials which are mingled with particle materials, or materials whose water content is high. And this type of dryer has a potential for high levels of dust emission. In an indirect-type rotary dryer, heat is applied by combustion gases on the outside of the cylinder or through steam tubes inside the cylinder. This type of dryer has much less tendency to emit dust. It is usually used when continuous drying of powdery or fine material is needed.
