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i.HOC in detail

 

1Rotation dryer inlet – 100% of the hot compressed air from the second compression stage
2Silica gel drum
3Regeneration air outlet
4Heat exchanger cools the regeneration air
5Condensate separator
6Radial fan balances out the drying process pressure losses
7Drying sector inlet
8Rotation dryer outlet
9Drum motor
10Optional pressure dew point sensor

To regenerate (Points 1, 2, 3) the desiccant, the i.HOC (integrated heat of compression) dryer utilises 100 percent of the available hot compressed air from the second compression stage. The advantages of this full flow regeneration become obvious, especially with increased coolant temperatures and at partial load, since the required heat is available at zero cost in the i.HOC process.

The dryer's controller ensures dew point stability even with fluctuating air deliveries and at compressor partial load. The speed of the drum (2) is automatically adjusted according to actual compressor performance in order to regenerate the desiccant as effectively as possible. This is the key to ensuring consistently low pressure dew points down to -30 °C.

Dryer efficiency still also depends on pressure differential: Pressure losses in conventional dryers are compensated for with a corresponding cost-intensive pressure increase in the compressor. Not so with i.HOC rotation dryers: The efficient radial fan (6) in the bottom of the dryer equalizes drying process pressure losses (7, 8) as required, thereby guaranteeing low pressure points with minimal fluctuation - the pressure at the dryer outlet (8) is higher than at the inlet.

 
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