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Wet air enters the
dryer and is directed into the drying tower through valve V1. The wet
air is dried in tower T1 and exits the dryer through check valve CV1.
Regeneration of tower T2 is accomplished by drawing ambient air into a
centrifugal blower B, increasing the pressure to 2.5 psig and blowing
this ambient air into heater H. The regeneration air is heated to 375°F
and is directed into tower T2, where it removes the water from the
desiccant. The hot, wet regeneration air exits the dryer through valve
V4. After 3 hours of heating, the heater is turned off and the dryer
enters the cooling cycle. |
Wet air continues to
be dried in tower T1. During cooling, you have a choice of cooling
methods. You can select blower cooling or exhaust purge cooling. If the
dryer is located in a warm, humid environment, the use of blower cooling
will cause an increase in dewpoint at tower shift. To provide continuous
low dewpoint, you may select exhaust purge cooling. When this mode of
operation is selected, the heater and blower are turned off at the end
of 3 hours. Valve V7 is opened and a small portion of dry air (5%) is
directed into tower T2 to cool the desiccant bed. After one hour of
cooling, the valve is closed and the dryer is ready to shift towers. |
