Compressed Air Dryer

The dryer consists of two adsorbers filled with dessicant.The condensed water from air is removed in the prefilter.
The wet oil free compressed air enters the adsorber at the bottom. The dessicant has high surface area and high affinity towards water vapour. The incoming water vapour gets adsorbed on the dessicant, and air gets progressively dried as it travels up the dessicant adsorber.

The dried air exits the adsorber from the top and is sent to the receiver/consumption points through the non-return valve Every five minutes, the compressed air is switched to the inlet of the other dessicant adsorber.

The adsorbed moisture is removed from the surface of the dessicant by depressurization as well as by passing a small stream of dry air over it.

A portion of the outlet dry air is passed into the top of the adsorber for purging purpose through the purge line.
The moist air and the purge stream laden with moisture exit the unit through the exhaust valve and the silencer.

By removing the moisture from the dessicant, the dessicant is reactivated for the next cycle.

By proper cycling of the air and exhaust Valves, the pressure of the two adsorbers is equalized before air is switched from one adsorber to the other. Pressure equalization helps in minimizing the dessicant bed movement and pressure fluctuations.

AS NO EXTERNAL HEAT IS REQUIRED TO REMOVE THE ADSORBED MOISTURE FROM THE DESSICANT, THE DRYER IS CALLED "HEATLESS AIR DRYER "