SIMULATION ON DYNAMIC AND CONTROL OF DISTILLATION COLUMN

   The distillation column is one of the essential separation processes in modern chemical and petrochemical industries so simulation of dynamic and control of distillation column was conducted in this work. For the control system, the important controlled variables were chosen to be the distillate composition (X_D), and the side stream composition (X_S). The manipulated variables are the reflux flow rate(R), and the side stream flow rate (L_S).Tuning of Control Parameters was found bythree methods; Zigler-Nicolas, Tyreus-Luyben andProcess Reaction Curve methods to find the best valuesof Proportional gain (Kc), Integral time (τ_I) andDerivative time (τ_D).P, PI and PID controllers were used as a control strategy for the system.The degree of interaction was determined based on Relative Gain Array (RGA) and should be avoided by implementing a decoupling system.The decoupling method was designed to eliminate the interaction effects between the control loops.Fuzzy logic control system was used as another strategy to compare with conventional control system. For all cases, the Fuzzy logic controller is found to be preferable.The frequency response method (bode diagram) was used in this work to study the stability of the system and it was found that a stable system is recommended.MATLAB program was used as a tool of solution for all cases used in this work.