Heatless desiccant air dryers are used for drying air flows of up to 200 Nm3/h. The usual applications are small and simple compressor stations in small shops and companies, dental clinics etc. Standard version includes a coalescing pre-filter (reduces oil content to <0,01mg/m3) and a particle after-filter.

ABOUT:

• Under pressure water molecules attach to the surface of the desiccant (molecular sieve, silica gel, …).
• Typically dew point is set to -40°C (or down to -70°C).
• Desiccant is placed in two vessels positioned in parallel to each other.
• While adsorption under pressure is taking place in the first column the regeneration is in depressurized second column.
• This process is called PSA (pressure swing adsorption).

Choosing the correct heatless desiccant air dryer type and dimension for the application is an important process that ensures the correct and efficient operation of the heatless desiccant air dryer and the application.

If the heatless desiccant air dryer is undersized:

1. Target dew point will not be reached.
2. Too high inlet water content will cause permanent damage to the adsorbent.
3. Too high air velocity will cause large pressure drop.
4. Intense movement of the adsorbent, which is caused by too high air velocity, causes intensive dust formation and reduces the lifetime of the adsorbent.
5. Indirect costs of undersized heatless desiccant air dryer are costs of reclamation, damage occurred in the production process, or even stop of production.

This article comes from omega-air edit released