https://onlinelibrary.wiley.com/doi/pdf/10.1002/rnc.1006

Process control, theory and application, Jean-Pierre Corriou, Springer, London, U.K., 2004, xx + 752 pp, ISBN 1-85233-776-1

The present study aims at bringing out the best features of model‐based control, linear cascade control when applied to highly non‐linear systems like pH‐controlled fed‐batch processes. For these processes, control of pH by conventional Proportional‐Integral‐Derivative controller fails to provide satisfactory performance, because of the extreme non‐linearity in the pH dynamics. In the present study, for a fed‐batch neutralization process, a non‐linear control law has been derived for the model‐based Proportional Integral controller. Typical problems in process control like sampling, delay and perturbations in model parameters are addressed in this study using model‐based control. The simulation results show the superior performance and robustness of the model‐based controller and linear cascade controller over that of the conventional Proportional Integral controller.

Model Based Controller and Linear Cascade Controller Applied to Fed Batch pH Process

The objective of this work is to implement the linear, non linear model based and linear cascade controllers to control pH in a fed batch neutralisation process in real time and compare the perform...

Real Time Control of pH in Fed‐Batch Process

The existing heat and power generation technologies involve the utilization of chemically treated water. Water treatment produces alkaline and acidic wastewaters, which must be neutralized. The paper considers the problem of optimal control of the chemical neutralization of acidic wastewater by means of lime water. The installation for neutralization consists of a tank and a recycling pipeline. The mathematical model of chemical neutralization comprises systems of nonlinear differential equations in parabolic partial derivatives to take into account the chemical reaction between the interacting components placed in the recycling pipeline or in the tank. The controlling action is alkali inflow rate at the inlet of the recycling-pump. The optimization problem is formulated as a problem of time-optimal control. It is shown that the time-optimal process of chemical neutralization is also optimal from the point of view of the accuracy of approaching to the neutral state.

Time-Optimal Control of Chemical Neutralization Process

The present study aims at bringing out the best features of model-based control, when applied to highly non-linear systems like pH-controlled fed-batch processes. For these processes, control of pH by conventional PID controller fails to provide satisfactory performance, because of the extreme non-linearity in the pH dynamics. In the present study, for a fed-batch neutralisation process, a non-linear control law has been derived for the model-based PI controller. Typical problems in process control like sampling, delay and perturbations in model parameters are addressed in this study using model-based control. The simulation results show the superior performance and robustness of the model-based PI controller over that of the conventional PI controller.

E. Sivakumar

Papers

Control of pH in Fed-batch Neutralisation Processes

Control ofpHinFed-batch Neutralisation Processes