Heated Purge Desiccant Dryers
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
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