Working principle and characteristics of rotary flash dryer
First, the working principle of rotary flash dryer
The hot air enters the bottom of the dryer at the appropriate spray speed from the inlet pipe into the agitating and pulverizing drying chamber, which produces strong shearing, blowing and rotating effects on the material, so the material is micronized by centrifugation, shearing, collision and friction. , enhanced mass transfer heat transfer. At the bottom of the dryer, the larger and drier pellets are mechanically broken under the action of the agitator, the moisture content is lower, and the particles with smaller particle size are entrained by the swirling gas stream and further dried during the ascending process. 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 heat and mass transfer between the two phases is enhanced, so the machine has high production intensity.
Second, the characteristics of rotary flash dryer
1. The material is highly dispersed due to centrifugation, shearing, collision and friction, and the relative velocity between the gas and solid is large, and the heat and mass transfer is enhanced, so that the machine has 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 does not directly contact the hot surface, which solves the problem of coking discoloration of the heat sensitive material.
4. Due to the high circumferential gas velocity in the drying chamber, the material residence time is short, achieving high-efficiency, rapid, and large equipment production.
5. The swirl chamber is built in the drying chamber to control the moisture of the material to a very low level.
6. The upper disperser of the drying chamber can control the particle size and humidity of the outlet material.
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