INDUSTRIAL DRYER RENTAL
For applications requiring dry air, our after-cooled
machines, air dryers, and filter sets ensure that you
receive the quality you require at the pressure you
need.
Compressors that are exposed to sub-freezing temperatures
require a pressure dew point under 0°C. For this
application a desiccant dryer is required to meet the
specification. Desiccant dryers usually contain two
pressure vessels, both filled with desiccant (activated
alumina beads).
ADSORPTION DRYER
In a desiccant dryer, the moisture from the compressed
air clings, like Velcro to the desiccant when the air
passes through the first tower. After a period of time,
when the beads in that tower are saturated, the compressed
air is switched to pass through the second vessel while the
first vessel is then flooded with air to dry out the
saturated beads. This process is then repeated after a set
period when the beads in the second tower are saturated,
moving the flowing air back to the first vessel while the
second vessel is regenerated and so on. To regenerate
desiccant beads, there are two techniques that are commonly
used.
Other types of desiccant dryers are as follows:
COLD REGENERATION
A small amount of the compressed air that has dried,
expands to atmospheric pressure in cold regeneration dryers
and the saturated desiccant vessel is sent over. The air is
much dryer due to the compressed air expansion. The
moisture moves from the desiccant to the dried air and into
the atmosphere. This type of regeneration results in very
short cycle times and a small amount of electricity –
only for the controls. The design is simple and reliable,
but up to 18% of the compressor power is used for
regeneration, making it a costly solution especially for
low pressures.
HEATED PURGE
In heated purge desiccant dryers, part of the dried
compressed air expands to atmospheric pressure and heat is
sent to raise the temperature to 150-180°C. Saturated
desiccant sends hot air through the vessel, moisture is
released and moves to the atmosphere with the air. In
heated blower purge desiccant dryers, a blower is installed
that moves ambient air to a heater. The air is warmed up to
150-180°C, and travels through the vessel with the
saturated desiccant. Moisture is released and travels to
the atmosphere with the air.
HTE Rental Services supplies heavy duty industrial
compressed air drying equipment to businesses.
