An on-line procedure is developed that uses estimates of the dominant eigenvalues of a reactor-exchanger system to detect impending unstable operating behavior. In the event reactor stability is threatened, changes are made in the reactor's nominal operating state through a procedure that ensures the attainment of an acceptable degree of relative stability. The reactor stability assessment is made through estimation of closed-loop eigenvalues derived from a physically-based dynamic model. The guiding of the reactor to safe and stable conditions is carried out through a multiloop control system that receives optimal process setpoints found from an interative search. Experiments were made on a laboratory autothermal reactor system to assess the correspondence of the predicted and observed degrees of reactor stability.
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