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Heatless Air Drying Unit has two Towers filled with Activated Alumina desiccant for continuous drying operation. At a time, one tower is used for drying of compressed air while the other tower is reactivated simultaneously. After a fixed time of interval, the drying towers get changeover automatically by operation of sequence timer and interconnected valves.

In this design, reactivation of desiccant has been done by continuous purging a dry air through the bed in reverse direction at atmospheric pressure and temperature.

Referring to the flow diagram, assume that the left tower is under DRYING and the right tower is under REACTIVATION. Air enters the tower from bottom side, passes up through the desiccant and comes out from the top. A small bleed flow is split from the exit dry air and enters the right tower at atmospheric pressure. This bleed air picks up the moisture from the desiccant and vented out to the atmosphere. After complete reactivation of desiccant, direction of control valves is reversed to place the left tower on reactivation and right tower on drying. And Dew point of (-) 40°C (ATMOSPHERICS PRESSURE) Air dryer capacity start from 10 SFM to 2000 SCFM

	Low operating cost
	Maintenance free operation
	230 VAC Power supply
	No Extra Energy required for regeneration
	Continuous duty with long efficient service life
	Desiccant life around 5 year
	Dew point (-) 40°C