In this stage, all the heat transferred from the drying medium to the material is used for the gasification of water, the surface temperature of the material remains constant (equal to the wet bulb temperature of hot air), nutsche filter dryer ,winterization filtration, the partial pressure of water vapor on the surface of the material also remains constant, and the drying rate is constant, so it is called constant-rate drying stage. And that second stage is a speed reduction dry stage. When the moisture content of the material reaches the critical moisture content after drying, it enters the stage of deceleration drying. At this time, the moisture content in the material is less, the moisture transfer rate from the interior to the surface of the material is lower than the gasification rate of the moisture on the surface of the material, and the drying rate is controlled by the moisture transfer rate inside the material. This is called the internal migration control phase. As the moisture content of the material gradually decreases, the migration rate of moisture in the material gradually decreases, and the drying rate decreases continuously, so it is called the falling rate drying stage.
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