Introduction to the working principle of desiccant air dryer

　　Since ancient times, humans have been accustomed to drying materials with natural heat sources and natural ventilation, which are completely restricted by natural conditions and have low production capacity. With the development of production, they are gradually replaced by artificially controllable heat sources and air dehumidifiers.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 or heated to evaporate mechanically, and then dried in an 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. Since natural drying is far from meeting the needs of production development, desiccant air dryers are more and more widely used. During the drying process, it is necessary to complete the transfer of heat and quality (moisture) at the same time to ensure that the partial pressure (concentration) of moisture vapor on the surface of the material is higher than that in the external space, and ensure that the temperature of the heat source is higher than the temperature of the material.
　　The working principle of the desiccant air dryer is that the compressed air enters the dryer from the air compressor, and exchanges heat with the evaporator of the refrigeration system. The water vapor in the compressed air is condensed into liquid water and discharged through the separator. The finished gas is dried from The outlet of the machine is discharged. Energy storage liquid enhances heat exchange. On the one hand, it adjusts energy consumption at part load. In order to save energy, for refrigeration dryers with larger processing capacity, compressed air first enters an "air-air exchange" heat exchanger. The treated compressed air exchanges heat with the imported compressed air to recover part of the cold energy. When the gas passes through the separator, the centrifugal force generated by the rotation causes the water droplets to condense and deposit at the bottom of the separator and is isolated from the airflow. The condensate is discharged through an electronically controlled discharge valve.
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