PI AND PID CONTROL OF A FUEL ADDITIVE REACTIVE DISTILLATION PROCESS

GIWA, Abdulwahab (2016) PI AND PID CONTROL OF A FUEL ADDITIVE REACTIVE DISTILLATION PROCESS. ARPN Journal of Engineering and Applied Sciences, 11 (11). ISSN 1819-6608

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Abstract

This research work has been carried out to investigate the perf ormances of proportional-integral (PI) and proportional-integral-derivative (PID) controllers tuned with C ohen-Coon, Tyreus-Luyben and Ziegler-Nichols techniques on a reactive distillation process used for the production of a fuel additive. The fuel additive considered was isopropyl alcohol that was obtained from the top section of a prototype r eactive distillation column plant developed with the aid of Aspen HYSYS. The model used for the process control was estimat ed using the data generated from Parametric Utility of the Aspen HYSYS prototype plant and pem command of System Identification Toolbox of MATLAB. Furthermor e, the open-loop and the closed-loop Simulink models of the system wer e developed and simulated appropriately. The results obtained from the open-loop simulations carried out revealed th at the system was a stable one because it was able to attain steady-states within the simulation times considered. Also obse rved from the closed-loop simulations was that the best tuning method for both PI and PID controllers in suppressing la rge and small errors was Tyreus-Luyben technique. However, in suppressing any error persisting for a long period of time, Ziegler-Nichols method was found to be the best for PI controller while for PID controller, it was Cohen-Coon tunin g technique. Further comparing the performance values of the controllers, it was discovered that the PID controllers tun ed with the different techniques were better than the PI controllers because the corresponding integral of square error (ISE), integral of absolute value of the error (IAE) and integral of time-weighted absolut e error (ITAE) values of the P ID controllers were found to be less than those of the PI controllers considered for the process.

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