by jasper » 04 April 2018, 05:34
This particular case is hard to control with a controller, as the solution is at the edge of the feasible region.
A simpler, non iterative solution exists.
For each kmol/s methane, you already know you need 0.56 kmol/s oxygen. You can measure the methane flow rate in the methane feed, and calculate directly the required oxygen flow using an information calculator. And put this number into the flow constraint.