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  • Hysys depressurization help

    by
    srihari5043
    Published on 12-10-2015 01:33 AM
    1 Comment Comments
    I am in process of calculating depressurization rate for condensate dehydrator .
    LPG condensate composition as follows :

    Component Mole %
    NITROGEN 0.0009
    H2S 0.0009
    CO2 0.0028
    METHANE 0.0911
    ETHANE 0.1548
    PROPANE 0.3015
    i-A-BUTANE 0.0805
    n-A-BUTANE 0.2154
    i-PENTANE 0.0503
    n-PENTANE 0.0612
    n-HEXANE 0.0307
    n-HEPTANE 0.0089

    I specified the following for the depressurization module in HYSYS:

    Total System Volume 87.1 M3
    Liquid Inventory 87.1 M3
    Wetted Surface area 117.2 M2
    Initial Pressure 58.6 BarG
    Initial Temperature 37.8 Deg C
    Orifice size 400 mm2
    Flow equation supersonic
    Valve type Liquid
    Environmental Factor 1
    Heat flux Model API521
    PV Work Term Contribution = 93%
    Coefficient of Discharge for Orifice = 0.84

    Results of simulation showing out let temperature are in negative

    Can any facing the same problem... please share your experience

    please check the hysys simulation on the hyper link.http://www.4shared.com/file/R8YyAOLT...hydration.html
    This article was originally published in forum thread: Hysys depressurization help started by srihari5043 View original post
    Comments 1 Comment
    1. mobek's Avatar
      mobek - 12-10-2015, 04:28 PM
      Depressuring = expansion results in lower temp. this is normal, check any thermodynamic textbook or just Google the Joule-Thompson effect...I did not check your file though.
      good luck.

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