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15 марта 2021 г. 10:14

The Heat of Compression Type Regenerative Air Dryers

The heat of compression (HOC) type regenerative air dryer is a twin tower type dryer with the primary distinction that the heat required for the regeneration process is taken from the compressor.  This process utilizes the heat of compression, thus the naming convention.  Some caution must be incorporated into the thought process of utilizing any of these design types.  Obviously, the compressor must have the capacity to continuously offer the heat needed for regeneration.  In situations where the compressor is running at part load or unloaded, inadequate heat levels could be experienced.  If this event occurs there is not enough heat from the compression process to regenerate the offline tower resulting in elevated dew points downstream.  While these units can be incorporated into both 2 stage oil-free rotary screw compressors, as well as centrifugal compressors, the more reliable of these applications, are with the 2 stage rotary screw type as the heat levels are typically higher than with a 3 stage centrifugal compressor.

 

The primary design of the HOC dryer directs all the discharged air from the compressor to the HOC dryer.  When using a HOC dryer, the compressor after-cooler is not used.  Remember, we need high-temperature air for regeneration. This hot air is first directed to the offline tower or tower that needs regeneration.  The hot air at this point is not saturated with water because of the elevated temperature (350 degrees F).  The air migrates through the offline tower picking up the moisture that is in the desiccant bed from its previous work cycle.  The air is then directed to an after-cooler where the air is cooled to 100 degrees F and then to a separator to remove the condensed moisture.  All of the air is then directed to the online or working bed where it is dried and then exits the dryer to the plant for use. 

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Автор: Статус: offline miapacky
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