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SPX FLOW Hankison DH-3000 User Manual

SPX FLOW Hankison DH-3000
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4
1.0 DESCRIPTION
1.1 Function
1.1.1 Dryer Dual tower regenerative desiccant dryers are an economical
and reliable way to dry compressed air to dew points below the freezing
point of water (dew points as low as -150°F [1 ppb @ 100 psig, 7.0 kgf/
cm
2
] are possible) or reduce the moisture content of compressed air when
used in critical process applications.
These dryers continuously dry compressed air by using two identical
towers, each containing a desiccant bed. While one tower is on-stream
drying the compressed air, the other tower is off-stream being regenerated
(reactivated, i.e., dried out). The towers are alternated on- and off-stream
so that dry desiccant is always in contact with the wet compressed air. In
this way a continuous supply of dry air downstream is possible.
Desiccant dryers lower the dew point of compressed air by adsorbing the
water vapor present in the compressed air onto the surface of the
desiccant. Desiccant is a highly porous solid containing extensive surface
area.
Adsorption occurs until the partial pressure of the water vapor in the air
and that on the surface of the desiccant come into equilibrium. As
adsorption occurs, heat is released (referred to as the heat of adsorption)
and is stored in the bed for use during regeneration.
Desiccant is regenerated by driving off (desorbing) the water collected on
its surface. Pressure-swing (also called heatless or heaterless because no
outside heat is added) dryers regenerate by expanding a portion (approxi-
mately 14 - 15% at 100 psig, 7 kgf/cm
2
) of the dried air to atmospheric
pressure. This “swing in pressure” causes the expanded air to become
very dry (have a very low vapor pressure). This very dry air (called purge
air) plus the stored heat of adsorption allows the moisture to desorb from
the desiccant. The purge air then carries the desorbed water out of the
dryer.
1.1.2 Optional Automatic Purge Saving System
The Automatic Purge Saving System is designed to save energy (purge
air) when pressure-swing dryers are operated at reduced loads.
The patented Purge Saving System operates by monitoring the changes
in temperature within the desiccant beds. These changes in temperature
are the result of heat (thermal energy) that is released when a bed is on-
line drying (heat of adsorption), and the heat that is used when a bed is
off-line being regenerated (heat of desorption).
The magnitude of these changes in temperature is an indirect measure of
the water vapor content in the air being dried. This information is used to
determine the time a tower stays on line during the drying cycle.

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SPX FLOW Hankison DH-3000 Specifications

General IconGeneral
BrandSPX FLOW
ModelHankison DH-3000
CategoryDehumidifier
LanguageEnglish

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