Abstract
The application of hill-climbing control in the plantwide control context for driving the setpoint corresponding to an unconstrained degree of freedom to the economic optimum steady state is demonstrated for a reactor-separator-recycle process. Optimality via hill-climbing is sought for two operation modes. In Mode I, the throughput is fixed and hill-climbing maximizes the process energy efficiency. In Mode II, hill-climbing is used to maximize process throughput. Rigorous dynamic plantwide simulation results show that hill climbing control reduces steam consumption by ~3.7% and increases plant throughput by ~3.0%, compared to constant setpoint operation.
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