Compressed air with high moisture flows into the drying tower. While it moves from the bottom to the top of the tower, moisture is adsorbed by the charged desiccant, producing dry compressed air. While the air is being dried in the drying tower, other towers engage in regeneration process to remove adsorbed moisture. The regeneration process is divided into heating and cooling processes. During the former process, the air sucked in from the outside by a blower is heated up to the set temperature through an electrical heater. After moisture is removed, the heated regeneration air is discharged to the outside through a muffler at the bottom of the regeneration tower. Once the heating process is complete, the cooling process needed to cool down the heated desiccant in the regeneration tower begins. The cooling process is divided into ZEHB Type which cools down the desiccant, using the am bient air sucked by a bower and ZEHC Type that cools off the desiccant with coolant by circulating regeneration air.

Once the cooling process is done, the desiccant regeneration process is also finished. Then, dynamic pressure process pressurizing regeneration tower starts. Once the dynamic pressure process is done, two towers are transferred. In the drying tower, then, the regeneration process is executed. In the towers where such regeneration process is completed, drying process is executed. A series of above processes are automatically repeated, providing dry compressed air.

In a zero-purge desiccant air dryer, the air compressor’s load factor is low without any purge which is consumed during desiccant regeneration. Depending on the adsorption tower’s regeneration temperature, diverse heating process control features are added, reducing power consumption (energy-saving model).