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Adsorption is a physical process of moisture removal on the porous surface of desiccant material, most used is activated alumina and molecular sieve. Adsorption desiccant air dryers use a desiccant material to adsorb water vapor present in the compressed air.
Desiccant air dryers normally are of twin tower vessel construction for non-stop adsorption compressed air and saturated desiccant regeneration.
- Pressure dew point -20 to -70ºC
- Max inlet temperature 38°C
- Max inlet pressure 10 bar(g)
- Max inlet oil content ≤ 0.1 ppm
Working Principle
Tower A : Drying mode. Wet compressed air enters the pressurized online desiccant tower A through the pneumatic valve (1). Up-flow drying enables the desiccant to strip the air stream of moisture. Dry compressed air exits through the check valve (4).
Tower B : Regeneration mode. Depressurize to atmosphere through muffler (8) when pneumatic valve (2) open.
Purge Air. 13% of dry compressed air is diverted before exiting (5) and passes through off-line Tower 2 and exits at pneumatic valve (2) to remove moisture from desiccant.
Article: Refrigerated dryer or Desiccant dryer ?
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