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Control principle of adsorption drying for medical compressed air plant

  • Tuesday, October 18, 2016 11:45 PM
    Message # 4312569
    Deleted user

    It is well known that in different time periods, Flow of medical compressed air is different, and  the number of compressor started by medical compressed air plant is also different.

    ThenAdsorption dryer integrated in the plantWhat parameters should be adopted to control the drying machine, in order to achieve the dew point temperature


  • Wednesday, October 19, 2016 6:19 AM
    Reply # 4312938 on 4312569
    Al Moon (Administrator)
    Johnny Ma wrote:

    It is well known that in different time periods, Flow of medical compressed air is different, and  the number of compressor started by medical compressed air plant is also different.

    ThenAdsorption dryer integrated in the plantWhat parameters should be adopted to control the drying machine, in order to achieve the dew point temperature


    5.1.3.6.3.7  Medical Air Dryers. Medical air dryers shall meet the following requirements: 
    (1) 
    They shall be designed to provide air at a maximum dew point that is below the frost point [0°C (32°F)] at 345 kPa to 380 kPa (50 psi to 55 psi) at any level of demand.
    (2) 
    They shall be sized for 100 percent of the system peak calculated demand at design conditions.
  • Wednesday, October 19, 2016 6:42 AM
    Reply # 4313006 on 4312569
    Al Moon (Administrator)

    Sorry for the large print - I was working from the phone. 

    Please also review the full section in NFPA 99 for additional information.

    Last modified: Wednesday, October 19, 2016 6:43 AM | Al Moon (Administrator)
  • Thursday, October 20, 2016 8:24 PM
    Reply # 4316026 on 4312569

    Typical systems use a dew point purge control that takes information from the dew point monitor output and controls the allowing of purge only after the dew point rises to a predetermined value. These vary from manufacture, but usually you will see that a rise of dew point to the +10 F will start the purge. The Beacon HMD type dryers are really dew point suppression style and will usually settle in at about 100 F below the inlet process air temperature. The Powerex and Amico systems are typical desiccant adsorption dryers and are capable of -40 F dew points.

    Last modified: Thursday, October 20, 2016 8:26 PM | Scott Jussel

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