Regenerative desiccant Air Dryer – (Heated & Heatless)

Air dryers are used for removing water vapor from compressed air and now they are commonly found in a huge range in commercial and industrial areas. Today in this article we are going to talk about regenerative desiccant Air dryer.

Regenerative desiccant Air dryer or “Heatless Air Dryer” or “Twin tower Air dryer” are used to remove all the water or vapor from compressed air at very low dew point. Regenerative desiccant Air dryer contain a special material known as desiccant (hygroscopic dry agent) which helps to absorb the moisture from compressed air. 

Through a refrigerated Air dryer a compressed air application can filter the proper and require air quality but when compressed air application getting exposed to freezing temperature then it is Regenerative desiccant Air dryer which maintain dew point, save energy and through its desiccant medium remove moisture from the compressed air when a wet air pass through the desiccant medium, which then adsorbs the moisture. Desiccant medium can absorb finite capacity of moisture before it dried out, or regenerated. Desiccant dryers generally construct in twin-tower structure, each tower contain its own desiccant bed because one bed is used to dry compressed air as the second process the undergoes regeneration.

Advantages of Regenerative Desiccant Type Dryers include:

1.    Regenerative Desiccant can achieve very low dew point without freeze-up.

2.     Regenerative Desiccant maintains the level of purge air.

3.     Regenerative Desiccant is designed to operate pneumatically for remote, hazardous, or mobile work sites.

4.     Regenerative Desiccant filter a compressed air down to-40oC (-40oF).

5.     Regenerative Desiccant maintain the pressure dew point of -70oC (-100oF).

6.     Regenerative Desiccant doesn’t require electrical power for operation.

Types of Regenerative desiccant Air Dryer

1.     Heatless (no internal or external heaters)

2.     Heated (internal or external heaters)

Heatless (no internal or external heaters): It is a type of Regenerative desiccant Air Dryer which uses only compressed air as a purge. As it is designed into two towers structure; each tower contains a Desiccant bed for the continuous filtration first vessel work as a dryer where temperature of air raise as much as 20° F and at the same time 15% dry air ported into the second vessel for regeneration and then moist air discharged from system. These dryers are used in Spray painting, Nitrogen generators, laboratory air & gas applications, etc….

Heated (internal or external heaters): As like its name heated regenerative desiccant air dryer has a heater in the circuit and provide more consistent dew point in compare with heatless desiccant. In heated regenerative desiccant air dryer only 3-4% dry air used as purge and also before the regeneration heated air dryer pre-heat the purge air. These dryers are used in CNC machines, CMM machines etc….

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