Process dehumidifier regeneration control method and apparatus
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United States of America Patent
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May 4, 2004
Grant Date -
Mar 4, 2004
app pub date -
Jul 21, 2003
filing date -
Jun 16, 2000
priority date (Note) -
Expired
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Abstract
A method and an apparatus for controlling airflow in a desiccant drying system having two desiccant beds (10, 12). A first diverter valve (14) communicates with each of the desiccant beds, a regeneration air inlet (22), and a press air outlet (20). A second diverter valve (16) communicates with each of the desiccant beds, a process air inlet (18), and a regeneration air outlet (28). First and second regeneration air control valves (24, 30) are also provided which during a cooling phase of the regeneration cycle admit a cooling bleed stream of process air to the desiccant bed being regenerated and then convey the cooling air bleed stream from the desiccant bed and through a heat exchanger (42) back to the process air inlet.
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