Application of PID controller in chemical process system using COMSOL

Process control covers the analysis, design, and application of control systems to achieve specific objectives in process safety, production capacity, and product quality. Control of any system is significant, especially in chemical process systems. For this, it is necessary to use a control that can meet the system's demands and work harmoniously. In this study, a system that can be adapted to the chemical process industry has been designed and modelled in the COMSOL program. The concentration level and velocity behaviour of the same type of fluid applied from two channels over this model were kept at the desired level with the Proportional Integral Derivative (PID) control algorithm. The flow rate of the fluids can be changed with the controller to achieve the desired concentration. As a result of the simulation with different PID coefficients, the best response was obtained when the high proportional gain coefficient was applied. It has been determined that the best response of the process in both concentration and velocity data is achieved when kp= –1 m4/(mol·s). A high overshoot and steady-state error occurred at low proportional gain values in the system response.