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  • kettle reboiler problem

    by
    marchese85
    Published on 11-04-2010 09:38 PM
    1 Comment Comments
    I have to size a reboiler for a batch distillation!!!The heating medium is steam available at 2 bar, while the liquid mixture boiled around 74 °C.
    I used a monstinki correlation to find a value of critical flux that is equal to 345500 kcal / h m2
    I fixed a overall hata coefficient of 900 W/m2 K, and the heat supplied is 25000 kcal/h.
    I fixed a overall heat coefficient of 900 W/m2 K, i find the total requested area, but the heat flux is over 5% of critical flux.
    How can i resolve this problem????
    Best regards
    Salvatore Ioanni
    This article was originally published in forum thread: kettle reboiler problem started by marchese85 View original post
    Comments 1 Comment
    1. aseptman's Avatar
      aseptman - 11-12-2010, 08:33 AM
      Kettle Reboiler for Batch Distillation:
      The TEMA type is say: AEU or simple vessel with U bundle
      The Duty of Kettle is to generate required Boilup.
      So your boil up is the max one in the batch operational sequence.

      Your prob thus is :
      Heating media: Steam at 2 bar(g) say 120 deg C
      Process Fluid temp: This changes throughout the batch take the worst case that is last operation temperature
      Heat Duty: To vaporise a pool of liquid at some rate say 2000 kg/hr This also then decides the Heat duty in Kcal/hr

      Now the heat duty you say is only 25000 looks very small . Is it a small dia column because for water it means 25000/550= 50 kg vaporization? for organics it means about 250 kg/hr vaporization

      As far as ur question goes
      ur critical flux is: 345500 Kca/hr/m2
      Duty is: 25000 Kcal/hr
      for flux to be over than 345500 your area is a fraction?
      also the U value for steam and org liq or even aq solutions shall be about 350-500 W/m2C
      Thus use less U value and get higher area so that flux cal is lower than critical one
      may be use hot water at 90 deg C?

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