Application 05
Drying and Moisture Control
Moisture in compressed air and gases damages equipment and processes; moisture in packaging damages sensitive products.
Quick answer
How does a desiccant dryer work?
Wet air or gas passes through a bed of desiccant, such as activated alumina or silica gel, which adsorbs the water vapour. Two beds usually work in turn: one dries while the other is regenerated by heat or a purge of dry air.
How it works
Activated alumina and silica gel are desiccants: porous materials whose internal surface adsorbs water vapour.
In dryers, two beds usually work in turn. One dries the gas while the other is regenerated by heat or a purge of dry air, then they swap.
- 01
Wet gas in
Air or gas carries water vapour.
- 02
Adsorb
The desiccant bed holds the moisture.
- 03
Dry gas out
Leaves the bed at a lower dew point.
- 04
Regenerate
Heat or dry purge drives the moisture off.
What to consider
- Required dew point
- Operating temperature and pressure
- Heatless or heated regeneration
- Bead or ball size for the vessel
Industries
Drying and Moisture Control: common questions
What is dew point?
Dew point is the temperature at which water vapour in a gas begins to condense. Desiccant dryers lower the dew point of compressed air so moisture does not condense in pipes and equipment.
What is the difference between heatless and heated regeneration?
Heatless dryers regenerate the off-line bed with a purge of dried air. Heated dryers use heat to drive off the moisture, which reduces the purge air required.
Discuss your drying requirement
Tell us about your application and requirements. Our team will help you identify the appropriate product for your needs.
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Fluoride Removal