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Large Dehumidifying Dryers Functional Description 17
2-5 Options
Closed-Loop Regeneration
An optional regeneration closed-loop valve and heat exchanger can be used to close the
regeneration loop during the cooling portion of the regeneration cycle. If this option is
enabled on the dryer, air will be bled to the atmosphere until the heating portion of the
regeneration cycle is finished. Then, the regeneration closed loop valve will direct air through
a water-cooled heat exchanger and back into the regeneration loop (see Figure 3 and Section
3-6: Connecting Aftercooler/Precooler Cooling Water).
Figure 3: Closed Loop Regeneration
AD600-AD1500
Dryer Flow Schematic
Regeneration Closed Loop
Cooling is Activated
Regeneration
Filter
Optional
Regeneration
Closed Loop
Cooler
Regeneration
Blower
Optional
Regeneration
Closed Loop
Valve
Regenerarion
Exhaust
Left Desiccant
Regeneration
Heaters
Dryer Valve
AD600-AD1500
Dryer Flow Schematic
Regeneration Heating is
Activated
Regeneration
Filter
Optional
Regeneration
Closed Loop
Cooler
Regeneration
Blower
Optional
Regeneration
Closed Loop
Valve
Regeneration
Exhaust
Left Desiccant
Regeneration
Heaters
Dryer Valve
Process Aftercooler
The optional aftercooler cools the moist air returning to the dryer from the drying hopper.
The aftercooler can cool the return air from 250ºF to about 150ºF. This maintains the dryer’s
efficiency and condenses the unwanted plasticizer from the air stream. The aftercooler
requires a cooling water connection (see Figure 4).
Figure 4: Process Aftercooler
High
Temperature
Gasket
Cooling Coil
Cooling Coil
Pipe Gasket
Mounting
Brackets
Stainless Steel
Cooler Housing
Cooling Coil
Cover Plate
High
Temperature
Gasket
Stainless Steel Cooler
Housing
Cooling Coil
Cooling Coil
Pipe Gasket
Cooling Coil
Cover Plate
Mounting Brackets