Feedforward output-feedback control for continuous exothermic reactors with isotonic kinetics |
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Authors: | Jorge Diaz-Salgado Jesus Alvarez Alexander SchaumJaime A Moreno |
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Affiliation: | a Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico (UNAM), Cd. Universitaria, 04510 Mexico D.F., Mexico b Universidad Autonoma Metropolitana-Iztapalapa, Departamento de Ingenieria de Procesos e Hidraulica, Apdo. 55534, 09340 Mexico, D.F., Mexico |
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Abstract: | The robust feedforward (FF) output-feedback (OF) control problem of (possibly open-loop unstable) continuous exothermic jacketed reactors with isotonic kinetics with respect to reactant concentration is considered. The volume, temperature, and concentration must be regulated by manipulating the feed, exit and coolant flowrates on the basis of volume and temperature measurements. The problem is addressed as an interlaced controller-observer design within a constructive control framework. The result is a quasi linear-decentralized (qLD) FF-OF dynamic controller which: (i) recovers (up to observer convergence) the behavior of a robust nonlinear FF-SF controller, (ii) has closed-loop stability conditions coupled with conventional-like tuning guidelines, and (iii) constitutes an add-on to the PI control scheme commonly employed in industrial reactors. The approach is tested with an open-loop unstable reactor example through simulations. |
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Keywords: | Reactor control PI control Output-feedback control Constructive control |
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