Abstract:

The problem of margin analysis and control design of FCC regenerator was solved through multi-objective mixed-integer dynamic optimization. For the problem, the ε-constraint method was used to deal with the multi-objective problem, the control performance objective was transformed into the control performance constraint, and the mixed-integer dynamic optimization problem was solved by relaxing the 0-1 variables and adding the additional equation constraints. From the Pareto optimal solution a relation curve between control performance and process margin was obtained, and the higher the control performance was required, the more the margin was needed. Through trade-off between two objectives, the optimal design of FCC regenerator which considered both process demand and control performance was found.