The adsorption dryer generally adopts a double tower type, one tower is used for adsorption, and the other tower is used for desorption. The actual working process of the heatless regenerative dryer is divided into three stages: adsorption, regeneration, and pressure equalization. In the working room, compressed air flows alternately through two tower containers filled with adsorbents A and B. When one tower is adsorbed under working pressure (high water vapor partial pressure), the other tower is near atmospheric pressure (drip pressure) The desorption is carried out under the condition of heating or heating, and then the two towers are switched to work alternately according to the set program.

The adsorption dryer achieves the drying effect through "pressure change" (pressure swing adsorption principle). Since the ability of air to hold water vapor is inversely proportional to pressure, a portion of the dried air (called regeneration air) is decompressed and expanded to atmospheric pressure. This pressure change makes the expanded air drier and then allows it to flow through the unconnected airflow. The desiccant layer to be regenerated (that is, the drying tower that has absorbed enough water vapor), the dry regeneration gas absorbs the moisture in the desiccant and takes it out of the dryer to achieve the purpose of dehumidification. The two towers work in a cycle, without heat source, and continuously provide dry compressed air to the user's gas system.

Compressed air dryer is a compressed air drying equipment made of the characteristics of adsorbent that has a large adsorption capacity for water vapor in the air at room temperature. The characteristic is that the compressed air treated by the adsorption dryer has a lower dew point and less water content, but consumes more energy.

The working principle of the adsorption dryer is shared here. In actual production, the actual energy consumption value is sometimes much higher than the theoretical value. For example, the residence time of the material in the drying hopper may be too long, the amount of gas consumed to complete the drying may be large, or the adsorption capacity of the molecular sieve may not be fully exerted, etc.