I am trying to simulate FCC main fractionator using aspen Plus. I am trying to model with actual trays and efficiency. I have configured all the PA with the specs of PA duty and flows. I am trying to run the columns with specs of all the product withdrawal flow rates are fixed. Cuurenty I am generating FCC rx effluent by using product backblending. (feed is generated using mixer of FG, LPG,gasoline, LCO and Slurry oil/decant oil)
Currently I am not able to match the Column internal traffic with actual observed one. Simulation is showing much higher Reflux, LCO IR, HCO IR flows than actual one. (almost 1.8-2 times than actual one) I have already rechecked all the input values.
Has anybody observed the same? Can you please suggest something (some thermodynamic option/ may be pseudo component property estimation option) to minimize this mismatch.. Currently I a m using Grayson Street as thermodynamic option, and aspen defaults methods for pseudo component property estimation.
Thanks in advance