The working process of the flash dryer is divided into the stages of crushing, gas-solid contact, drying, and classification.
1. When the material enters the dryer, it will be broken by the stirring blade and high-speed airflow, thereby increasing the dispersion of the material and the surface area of the wet material per unit volume.
2. After the material is crushed, it is blown up by the hot air flow generated by the high-speed rotation to form a fluidized layer. In the drying process of mass and heat transfer between the material and the hot air, most of the water evaporates at this stage. After the material is further crushed and evaporated, the buoyancy is greater than the gravity, and the material starts to move upwards and is discharged out of the dryer after classification.
3. The stirring paddle of the flash dryer crushes and diffuses the material, and the air entering the dryer is also in a state of debugging turbulence, which quickly reaches gas-solid mixing. The bulk material falls downward under the action of gravity. Because the bottom of the dryer has an inverted cone structure, the airflow speed is very large, which can ensure that the bulk material is in a good fluidized state and is surrounded by hot air.
4. The classifier is a ring-shaped baffle mounted on the top of the dryer. It is affected by centrifugal force. When the material rises with the airflow, the rotating radius of the bulky and undried material becomes larger. When the rotating radius is larger than the radius of the grading ring, it will be blocked. In the drying chamber, the dryer cannot be discharged through the classifier until the requirements are met. However, the large particles in the outer layer are continuously crushed and dried, and after the centrifugal force becomes smaller, they also move toward the inner ring, and are carried out by the gas when the moisture meets the requirements.
https://www.stardrying.com/
