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Thread: Article: kettle reboiler problem

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    Article: kettle reboiler problem

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  • #2

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    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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