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What is an Air Dryer?

Compressed air is air kept under pressure that is greater than atmospheric pressure (14.7 psia). When air is heated by the compression process, its ability to hold moisture increases.

In simple terms, compressed air dryers remove moisture from compressed air.  By cooling the air to a temperature that causes the moisture in the air to condense,  water drops out of the air. The units we supply use two different drying techniques: refrigeration and desiccant to remove water in its liquid and vapor form from compressed air.

What’s the difference between refrigeration and desiccant dryers?

The processes by which moisture and water are condensed, separated and removed from the compressed air differ between refrigeration and desiccant units.

REFRIGERATION

Cycling refrigeration dryers are the most common and economical compressed air dryers on the market and provide the drying requirements for most applications. Units offered are rated for a capacity of 20– 5,600 SCFM and dew points of 35ᵒF to 38ᵒF. Cycling refrigerated air dryers are popular because they are cost effective and require low maintenance and operating costs.

Similar to a household refrigerator, the dryer will only run as much as it needs to maintain a constant dew point, meaning no adjustments.  And since the dryer operates at a full load a fraction of the time, its energy consumption is reduced automatically in partial and zero load capacities. This means savings for the customer.  Most often, cycling refrigerated compressed air dryers will meet the requirements for most applications.

Available Refrigeration Products

DESICCANT

Based on the type of desiccant dryer, the process will vary slightly. We offer heaterless and heated purge desiccant dryers. Units offered are rated for a capacity of 1 – 5,100 SCFM and dew points of -40ᵒF to -100ᵒF.

Desiccant is an inert, hygroscopic regenerative adsorbent material with an enormous surface to mass ratio. Acting similar to a magnet, moisture adheres to the desiccant material which collects the water vapor. The dryer consists of dual drying chambers which are alternately cycled through drying and regeneration cycles. One chamber is drying air at all times.

Wet, compressed air flows through one drying tower where water vapor is adsorbed into the desiccant. After time, the desiccant will become saturated and will need to regenerate. The off-stream chamber is regenerated by taking a small amount of the dried process air (purge) and passing it through the bed at low pressure. The moisture trapped in the desiccant is released and carried off by the purge flow and exhausted into the atmosphere.

Our refrigeration and desiccant compressed air dryers, filters and accessories are designed for a variety of industrial processes to eliminate condensate, oil and other impurities.

Available Desiccant Products

 

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