Page 18 - PNEUMATIC AND HYDRAULIC

1.2.4 Adsorption

1. Adsorption drying is based on a physical process.
2. Adsorption means substances are deposited on the surface of solid bodies.

4. This process is also known as regenerative drying.
5. The drying agent is a granular material (alumina, gel silica). The porous

surface of the granules is filled with liquid when the compressed air flows

through.
6. The saturated gel bed is regenerated by a simple method.

7. Warm air is blown through the dryer and takes up the moisture.
8. As a rule, two dryers are connected in parallel. While one of this drying the

air, the other is regenerated.

9. The capacity of gel bed is limited. Under normal conditions, it will be
necessary to replace the drying agent every 2 to 3 years.

Figure 1.11: Absorption drying process.

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