No Loss Split Flow Air Dryer

In This Jog Waste Dryer for moisture removal, 60–70% of the wet stream in this type of dryer is directed to the desiccant tower after being split into two streams by a distributor.

The rest is circulated in the second tower, which is undergoing regeneration, before being sent to the heater for regeneration. An exchanger of the shell and tube type separates the moisture that this stream has absorbed. This regenerated air or gas is returned to the distributor, where the pressure is maintained at 0.5 Kg/Cm2 less than the pressure of the incoming air or gas. As this is a closed circuit, there is no pressurized air or gas loss. This dryer can achieve a dew point as low as (-) 70°C. Nonetheless, the units’ pressure drop can reach 1.0 kg/cm2.

At the air dryer’s intake, a differential distributor valve separates the moist air and gas streams. A portion of this gas or air stream is heated to a regeneration temperature of 160–180 °C by an external heater before being supplied into the Absorber desiccant tower A, which contains activated Alumina, which draws moisture from the desiccant bed.

The desorbed moisture that is routinely discharged through the automatic drain trap is condensed by a water-cooler /air-cooler. After condensing, this air/gas stream joins the primary incoming airstream and travels to tower B, where it is dried. The average cycle time required to accomplish an operation is 8+8 hours. The switchover happens automatically after each procedure.

The dew point at the dryer’s exhaust is -40 °C. Standard accessories for the air dryer include simplex and duplex pre-filters and after filters, flowmeters, dew point meters, etc. The system has feedback to/from the main DCS and Timer/PLC controllers, making it fully or semi-automatic.