Non Thermal Adsorption Refrigerated Dryer Heatless Desiccant Air Dryer

Non thermal adsorption dryers are typically filter layers made of activated alumina, silica gel, or molecular sieves. During the drying phase, compressed air flows through one of the desiccant towers, where the moisture is adsorbed by the desiccant. A portion of the dried air, known as the regeneration gas, is then heated and expanded to a lower pressure. This pressure change makes the expanded gas even dryer and is directed through the other desiccant tower that has absorbed sufficient moisture. The dry regeneration gas removes the moisture from the desiccant, carrying it out of the dryer to achieve the dehydration purpose. The two towers work in a cyclic manner, providing continuous supply of dry air to the user's pneumatic system without the need for an external heat source.

Adsorption process:
The compressed air processed by the heatless adsorption dryer enters the working adsorption tower and flows through the adsorbent bed. Adsorbents have a large specific surface area and hydrophilic microporous structure. When compressed air flows through, the water vapor molecules in the air are strongly attracted by the intermolecular forces on the surface of the adsorbent and firmly locked inside the micropores.

Regeneration process:
This adsorption process will continue until the adsorbent approaches saturation, at which point the dew point of the outlet air will begin to rise. The system will switch to the regeneration stage based on the preset time or dew point monitoring signal. When tower A is undergoing adsorption, tower B is in the regeneration stage. Decompress a portion of the compressed air that has been dried by tower A and has an extremely low dew point pressure. The regenerated gas after decompression becomes very dry and has strong water absorption potential. This low-pressure dried regenerated gas flows in the opposite direction of the gas flow during adsorption, passing through the saturated B tower adsorbent bed. The purpose of regeneration is to desorb the adsorbed water from the B tower adsorbent and restore its drying ability.

Exhaust process:
As adsorption progresses, the adsorbent bed will form an adsorption front. After drying, the compressed air reaches the required low dew point and flows out from the top of the tower. After passing through the post filter, it is supplied to downstream use. And the regenerated gas carrying a large amount of moisture is directly discharged into the atmosphere.

Compressed air is an indispensable operating and processing power in all industrial fields and technological production processes. To prevent production interruption, it is required that the compressed air be clean, dry and free of oil. Compressed air is obtained by pressurizing a large amount of ambient air.

The Non-heat Regenerative Adsorbent Dryer, also known as the Heatless Desiccant Air Dryer, is an advanced device specifically designed for processing compressed air. Utilizing the principle of pressure swing adsorption (PSA), this dryer employs highly absorbent alumina or molecular sieve materials to effectively remove moisture from compressed air, typically drying it to a dew point of between -40 and -70 degrees Celsius.