Working Principle of an Adsorption Dryer

An adsorption dryer achieves its drying effect through pressure swings (the principle of pressure swing adsorption). Since air's capacity to hold water vapor is inversely proportional to its pressure, a portion of the dried air (called regeneration gas) is decompressed and expanded to atmospheric pressure. This pressure change dries the expanded air even further. The air is then passed through the desiccant layer that is not connected to the air flow and needs to be regenerated (i.e., the drying tower that has absorbed sufficient water vapor). The dry regeneration gas draws out the moisture from the desiccant and carries it out of the dryer, achieving the desired dehumidification effect. The two towers operate in a cycle, requiring no heat source, to continuously provide dry compressed air to the user's gas system.