Compressed Air Dryers

High Capacity Refrigerated

Cycling Refrigerated Air Dryers

Refrigerated
Air Dryers

High Temperature Refrigerated

High Pressure Refrigerated

Regenerate
Desiccant

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Compressed Air Dryers
The proper use of a compressed air dryer will improve the quality of the compressed air and avoid problems such as corrosion and contamination at the point of use. Moisture, either liquid or vapor, is present in compressed air as it exits the compressor system. If not properly removed the compressed air system can lose efficiency, require increased maintenance and result in possibly costly downtime.

Refrigerant Dryer
The most commonly used dryer is the refrigerant-type design. They tend to be low in initial cost and low in on-going operational cost. This makes them very popular. There are cycling and non-cycling dryers, each with specific advantages for certain applications.

Deliquescent Dryer
Another type of dryer is the deliquescent-type, which uses a drying medium that absorbs rather than adsorbs the moisture. Two very similar words – but one is spelled with a “b” and the other with a “d” which makes a big difference. The deliquescent dryer absorbs (with a “b”) the medium. It uses it up as it changes from solid to liquid and cannot be regenerated. Chemicals such as salts of sodium, potassium and calcium are used.

Desiccant Dryer
A regenerative-type dryer is the heat-of-compression desiccant dryer, which uses the heat generated during compression to accomplish desiccant regeneration. There are single vessel and twin tower type desiccant dryers. The single vessel dryer provides continues drying with no cycling. The twin tower type dryer has the desiccant in the saturated tower regenerated by means of the heat of compression in all of the hot air leaving the discharge of the compressor.

Membrane Dryer
Used commonly for gas separation, such as in nitrogen generator operation, a membrane dryer allows oxygen to pass through a membrane faster than nitrogen (for example) leaving a concentration of the desired end product (nitrogen) at the outlet of the generator. When used as a dryer in a compressed air system, it allows water vapor to pass through the membrane faster than air, thus reducing the dew point.

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