I have simulated both a demethanizer and deethanizer in HYSYS. Getting the towers to converge based on product specs (and actual GC data) is not a problem. However, the reboiler duty calculated by HYSYS is much higher than what is seen in the plant. For example the deethanizer duty is 90% higher than what is calculated by seperate heat balances on both the actual reboiler and the oil heater that feeds it. I do not doubt the product flows and compositions that I am using as they are used for accounting and are verified by 3rd parties in addition to internal QA/QC.
Has anyone experienced similar problems? Am I missing a very simple solution?
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