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VIII.
COMPONENT DESCRIPTIONS
Desiccant dryers work on the principle of adsorption.
removing water VAPOR from the gas stream. All condensed entrained liquid water
should be removed from the gas stream prior to reaching the dryer by suitable
separators, traps, filters, and drains.
All desiccants are adversely affected by oil, oil aerosols, dirt, rust, scale or liquid water.
Effective pre-filtration in conjunction with condensate drainage is a must for proper dew
point depression and long desiccant life.
A.
Process Components
1. Pre-filter
Inlet gas will pass through a cartridge type pre-filter to remove condensate and oil
which could contaminate the desiccant bed. Two manual valves (V1& V2) allow
the filter to be isolated and changed without depressurizing the system.
2. Dryer Vessel
This is a regenerative system in which the vessel removes moisture from the
process stream.
3. After-filter
Dry gas, which contains desiccant dust, will pass through a cartridge type after-
filter to remove the dust. Two manual valves (V5 & V6) allow the filter to be
isolated and changed without depressurizing the system.
B.
Regeneration Components
1. Blower
The regeneration blower circulates the gas through the vessel and entire
regeneration circuit. Mounted inside of pressure housing, the explosion-proof
motor is direct coupled to the blower.
2. Heater
The flanged immersion heater is designed to raise the regeneration gas
temperature to 425
temperature is monitored by thermocouple at the outlet of the heater. The PLC
controls the heater output through ON-OFF cycling of contactors.
3. Cooler
Hot regeneration gas leaving the dryer bed must be cooled prior to entering the
separator. The hot gas passes through the air-cooled heat exchanger. A motor
driven fan draws air across the fins removing heat and condensing moisture.
4. Separator & Sump Tank
The separator separates moisture condensate from the gas stream. A coalescing
element ensures that fine mist is removed from the gas stream. Condensate
drains to the sump tank which MUST be drained after each regeneration.
NG-SR IOM
°
F prior to flowing into the saturated dryer bed. Heater outlet
28
Adsorption is the process of
PSB INDUSTRIES
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