Introduction to the working principle and purpose of the desiccant air dryer

Desiccant air dryer is a mechanical equipment that heats the moisture (generally refers to moisture or other volatile liquid components) in the material to vaporize and escape to obtain a solid material with a specified moisture content. The drying process requires a large amount of heat energy. In order to save energy, certain materials with high moisture content, suspensions or solutions containing solid substances are generally dehydrated mechanically or heated to evaporate, and then dried in a desiccant air dryer to obtain dry solids.

The purpose of drying is for material use or further processing. For example, drying of wood before making wooden molds and woodware can prevent product deformation, and drying of ceramic blanks before calcination can prevent finished products from cracking. In addition, the dried materials are also easy to transport and store, such as drying the harvested grain to a certain moisture content to prevent mildew. During the drying process, it is necessary to complete the transfer of heat and quality at the same time to ensure that the partial pressure of moisture on the surface of the material is higher than that in the external space, and to ensure that the temperature of the heat source is higher than the temperature of the material. 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 external space, so that the difference in moisture content appears on the surface and inside of the material. The internal moisture diffuses and vaporizes to the surface, so that the moisture content of the material is continuously reduced, and the overall drying of the material is gradually completed.

Adsorption mass transfer and adsorption equilibrium. The adsorption process is a mass transfer process in which water vapor in compressed air diffuses to the adsorbent and is adsorbed.
　　

When compressed air comes into contact with the porous solid adsorbent, water molecules are adsorbed when they hit the surface of the solid adsorbent. At the same time of adsorption, some of the adsorbed water molecules leave the surface of the adsorbent and return to the airflow due to the collision of their own thermal motion and external gaseous molecules. When the number of adsorbed water molecules is equal to the number of water molecules leaving the surface of the adsorbent, the adsorption equilibrium is reached.
　　

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