by jasper » 15 March 2013, 14:57
You have configured your reaction rate as 100 mol/s/m3 irrespective of the amounts of SO2 and O2 actually present. If you plot flow rate along the reactor you will see that the reactants run very near the entry, but with your reaction formulation the reaction will continue at 100 mol/s/m3. Hence, CO2 and O2 are present at negative amounts, total flow becomes negative, the reactor tries to flash the stream at negative flow rate and COFE does (rightly) not allow for it.
It makes more sense to formulate your reaction rate as a function of the amount of SO2 and O2 present (and temperature?)
Why do you have multiple reaction packges in your document?