Controle de um reator CSTR não isotérmico utilizando o sofware livre Scilab

Abstract

The present work addresses the control of a non-isothermal reactor, using a PID driver. This reactor undergoes internal temperature changes due to an exothermic reaction and possible disturbances outside the system. The controller tuning was performed by three distinct methods: Ziegler-Nichols method, Cohen-Coon method and Astrom & Hagglund method. All simulations were performed in XCOS application of software free Scilab, which has its own structure for control loop elaboration. With this, analyze the controller performance with one of three tunings by inserting a steptype disturbance into the input concentration, temperature and set-point change. In all cases, the system was controlled by manipulating water leakage in the reactor cooling jacket. The results showed that the best method of control of the regulatory problem, represented by disturbances in the concentration and inlet temperature, was the Ziegler-Nichols method. To not change the set-point, the servomotor problem, the best tuning method was Astrom and Hagglund. Through sensitivity analysis of the driver parameters, it was possible to analyze the influence of each of the system control loop response terms.