The principle of rotary flash dryer

The principle of rotary flash dryer

The principle of rotary flash dryer
1. Principle The hot air enters the agitating and pulverizing drying chamber from the bottom of the dryer at the appropriate spraying speed by the inlet pipe, which produces strong shearing, blowing and rotating effects on the material, so the material is subjected to centrifugation, shearing, collision and friction. Micronized, enhanced mass transfer heat transfer. The material enters the dryer by the screw feeder. Under the strong action of the high-speed rotary agitator, the material is dispersed under the action of impact, friction and shear. The bulk material is rapidly pulverized, fully contacted with hot air, heated and dried. The dehydrated dry powder rises with the hot gas flow, and the classification ring intercepts the large particles. The small particles are discharged from the center of the ring to the outside of the dryer, and are recovered by the cyclone separator. The dry material is not dried or the bulk material is subjected to centrifugal force to the wall. It is pulverized and dried to the bottom. Since the gas-solid two phases are rotating, the solid phase inertia is larger than the gas phase, and the relative velocity between the solid and gas phases is large, and the mass transfer heat transfer between the two phases is strengthened, so the machine has high production intensity. Second, the characteristics 1, because the material is subjected to centrifugation, shearing, collision, friction and is highly dispersed, and the relative velocity between the solid and gas phases is large, which enhances the mass transfer heat transfer and makes the machine have high production intensity. 2. The dry gas enters the bottom of the dryer, which produces a strong swirling airflow, which produces a strong scouring effect on the material on the wall to eliminate the sticking phenomenon. 3. In the high temperature zone at the bottom of the dryer, the heat sensitive material is not in direct contact with the hot surface, and a special device is installed to solve the problem of coking discoloration of the heat sensitive material. 4. Due to the high gas velocity around the drying chamber, the material residence time is short, achieving high efficiency, fast, small equipment and large output. 5. The top of the drying chamber is equipped with a ceramic ring and a swirling sheet to control the particle size and humidity of the outlet material to meet the final moisture and particle size requirements of different materials. For details, please refer to the website of Changzhou Binda Dry Granulation Equipment Co., Ltd.