Truck air dryers are devices that reduce the moisture vapor content of the working medium. It is a mechanical device that vaporizes and escapes the moisture (generally refers to moisture or other volatile liquid components) in the material by heating to obtain solid materials with specified moisture content.
Purpose of the dryer
The purpose of drying is for the needs of material use or further processing. For example, the drying of wood before making wooden molds and woodware can prevent product deformation, and the drying of ceramic blanks before calcination can prevent finished products from cracking. In addition, the dried materials are also convenient for transportation and storage, such as drying the harvested grains to below a certain moisture content to prevent mildew. Since natural drying is far from meeting the needs of production development, various mechanized air dryers are more and more widely used.
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.
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