Do you know the working principle of drying equipment? The editor of Cheapest Cold Air Drying Equipment will take you to a simple understanding.
The drying process needs to consume a lot of heat energy. In order to save energy, some materials with high moisture content, suspensions or solutions containing solid substances are generally dehydrated or evaporated by heating, and then dried in a dryer to obtain dry solids.
In the drying process, it is necessary to complete the transfer of heat and mass (moisture) at the same time, to ensure that the partial pressure (concentration) of the moisture vapor on the surface of the material is higher than the partial pressure of the moisture vapor in the external space, and to ensure that the temperature of the heat source is higher than the temperature of the material.
The heat is transferred from the high temperature heat source to the wet material in various ways, so that the moisture on the surface of the material is vaporized and dissipated to the outside space, so that the difference in moisture content appears on the surface and inside of the material. The internal moisture diffuses to the surface and vaporizes, so that the moisture content of the material is continuously reduced, and the overall drying of the material is gradually completed.
The drying rate of the material depends on the rate of surface vaporization and the rate of diffusion of internal moisture. Usually, the drying rate in the early stage of drying is controlled by the surface vaporization rate; then, as long as the external drying conditions remain unchanged, the drying rate and surface temperature of the material remain stable. This stage is called the constant-speed drying stage; when the moisture content of the material decreases to a certain level When the diffusion rate of the internal moisture to the surface decreases and is smaller than the surface vaporization rate, the drying rate is mainly determined by the internal diffusion rate, and decreases continuously with the decrease of the moisture content. This stage is called the deceleration drying stage.
The above is the editor of Cheapest Cold Air Drying Equipment: a brief introduction to the working principle of drying equipment.