An Approach to Controllability and Economic Design of Nonlinear Systems with Multiplicity

摘要

This paper introduces a generic method to incorporate an aspect of dynamic controllability into steady state process design, that of bifurcation behaviour. This approach consists of identifying the dynamic behaviour of an existing process, and following a design method, which determines a trade-off between good dynamic behaviour and good economic performance. The algorithm determines a sub-optimal solution subject to singular constraints. The economic objective is penalised for poor controllability and the retrofit design will be "bifurcation free" over the disturbance and operating range of interest. This method can provide a design analysis tool to be used to compare or screen alternative conceptual designs at an early stage by introducing quantitative economics and qualitative dynamics. An industrial polymerisation reaction example presented illustrates the application of this approach.