Introduction to the process principle of heatless adsorption dryer

Adsorption is a phenomenon in which the concentration of a substance changes automatically at the interface of two phases. All solids have the ability to adsorb molecules, atoms or ions in the surrounding medium to their surface. From a thermodynamic point of view, the fact that a solid surface can absorb other media is the energy present on the solid surface, which is physically called "surface free enthalpy" and absorbs other substances to absorb its own surface energy. Because it tends to decrease.

The heatless adsorption dryer  uses the characteristic of adsorbents to selectively adsorb certain components, and absorbs moisture in compressed air to achieve the purpose of drying. Since the adsorbent will reach saturation equilibrium after being adsorbed for a certain period of time, it needs to be regenerated with dry gas to restore the adsorption and drying capacity.

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

It uses activated alumina with a pore diameter similar to the diameter of water molecules as the adsorbent. The partial pressure of water molecules in the air is greater than the partial pressure of water molecules in the adsorbent. The water molecules enter the adsorbent and condense into water droplets on the surface of the adsorbent. Release condensation heat, and store this heat in the upper part of the adsorption tower. During regeneration, about 15% of the dry air enters the regeneration cylinder under normal pressure through the needle valve, so that the water molecules in the adsorbent can escape, and the heat stored in the adsorption tower helps the analysis. The adsorbent undergoes adsorption, regeneration, and adsorption cycle use, and the compressed air is continuously adsorbed and dried to obtain a deeply dried gas.

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