Aircel AHLD E-Series - Design Parameters; Dryer Description; How It Works

Heatless Regenerative Desiccant Air Dryer | AHLD Series
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How It Works
1. Moisture saturated compressed air enters the coalescing
pre-lter, where aerosols are coalesced then drained via
an automatic drain system.
2. The moist water vapor-laden inlet air free of liquid
water ows to the inlet of the dryer through the APV
(Automatic Piston Valve) (A), which diverts the inlet air to
one of the towers - in this example, Tower 1.
3. Air ows upward through the adsorbent bed removing
the moisture vapor; the dried airow exits the tower
through the outlet valve (B), owing to the outlet
particulate after lter, which removes particulates
from the air stream. Clean and dry air now ows to the
customer process air distribution system.
4. As one tower is drying air, the other tower will be
regenerating (purging) the adsorbent bed. In this
example, Tower 2 will be regenerating. Prior to
regeneration, the exhaust valve (C) is opened and the
tower is depressurized to near atmospheric pressure, the
tower will now be regenerating. During the regenerating
process, a small portion of dry outlet compressed air is
used, 15% on average based on standard design capacity
of 100 psig, 100°F inlet air, 100°F ambient air, and
pressure dew point of -40°F.
5. The dry regeneration airow is channeled through
the outlet orice to the regenerating tower, removing
moisture from the adsorbent bed and exits the
regenerating tower through exhaust valve (C) and
exhaust muer to ambient. After regeneration cycle
is complete, valve (C) closes, causing Tower 2 to
repressurize to line pressure.
6. Next, the tower will switch when exhaust valve (D)
opens, causing Tower 1 to depressurize and regenerate.
Simultaneously, the inlet and outlet APV valves (A) will
shift the pistons to the low pressure Tower 1, causing
the inlet airow to be diverted to Tower 2, which will now
be the drying tower. This switching process will continue
repeatedly.
7. The dryer control system is completely automatic and
cycles the system through the drying and regeneration
cycles. The standard cycle drying time is 5 minutes,
regeneration cycle is 4 minutes, and repressurizing cycle
is 1 minute.
DESIGN PARAMETERS
DRYER DESCRIPTION
Type of dryer: Desiccant
Power supply: 460 Volt / Three Phase / 60Hz
Desiccant type: Premium Grade Activated Alumina
All Models
Parameter
Description Air Pressure
Air Inlet
Temperature
Ambient
Temperature
Maximum 135 psig 120 (°F) 120 (°F)
Minimum 60 psig 40 (°F) 38 (°F)