Abstract

Feedback control of a large counter current heat exchanger employed as a once-through steam generator for a breeder reactor power plant is presented. The mathematical model of the exchanger consists of a set of nonlinear partial differential equations with boundary conditions specified at three space points. The system structure does not allow the control signals to be distributed in space; they are applied only at the boundary points. The objective of the investigation is to choose a practical implementable time-invariant feedback controller which would give satisfactory regulation of the system. Although the emphasis is placed on a specific once-through steam generator system, the techniques used here are equally applicable to other heat exchanger systems.

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