KRD series heatless regenerative desiccant air dryer is designed to obtain consistent outlet pressure and dew point, minimum purge air of 14% and long desiccant life.Contact Us Customer Service < Back
The KRD dries the air by operating four solenoid valves to alternate the airflow between two columns.
1.The compressed air flows from the bottom to the top of one of the two columns:
(A). For a certain period of time and transfers water vapour to the adsorbent substances. At the same time,
14% of the dries air passes through a by-pass, expands to atmospheric sure and flows from the top to
the bottom of the other column.
(B). Removing the moisture that the adsorbent substance had adsorbed during the previous cycle. This
phase, known as the regeneration phase, is shorter than the drying phase in order to allow the
regenerated column time to return to operating pressure.
2.A new cycle begins, passing the incoming compressed air into column (B) while column (A) is now
Consistent outlet pressure and dew point
a) Accurate columns design to ensure minimum of 4.8 seconds contact time between inlet air and absorbent
substance for the desired dew point.
b) Extra desiccant filled to compensate natural bed aging, this ensures optimum performance over the
expected life span.
c) Modern design flow diffusers ensure air flow evenly through desiccant bed and prevent “channeling”
Minimum Purge Air of 14%
a) Advanced column design retains heat of adsorption which increases regeneration temperature, this
improves completeness of regeneration.
b) Drying and purging air in counter flow arrangement to increase drying efficiency.
c) Purge air capacity can be adjusted to match with specific loading of the dryer.
Long Desiccant Life
a) The dryer is designed to ensure the air flows through the desiccant bed with best air velocity and contact
time, thus optimum drying effect is achieved.
b) High efficiency oil removal filter is installed in the upfront of the dryer in order to eliminate oil and
particulates from the inlet air to protect the desiccant against pollution.
Working Principle Diagram
Purge air: ≤12~15%
Inlet oil content: ≤0.1mg/m³
Outlet air pressure dew point: -70 °C ~-20 °C
Desiccant: Activated alumina +Molecular sieves
Working periods: T=4-20min
Inlet temperature: 0 °C ~45 °C
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