Fuzzy Logic Controller Design and Implementation for Delayed and Nonlinear Time Variant Batch Distillation Column

Distillation column is a non-linear time variant system with delay time. It is very difficult to model due to the difficulty in obtaining parameters in real time during the distillation process. Fuzzy Logic Control (FLC) method is suitable for solving the above problem. The advantages of fuzzy controllers based on fuzzy logic systems are intuitive designs which reflect the behavior of human operators and the fact that controlled process models are not required. Design and implementation of FLC in the batch column distillation have been done. FLC is particularly designed to overcome those problems using 2 inputs (error and time) and 1 output reflux ratio. PID controller is also designed as a comparison. The implementation used 3 liters of low concentration ethanol (30
^%
). The setpoint is set up in 80% concentrate. The results show that FLC is able to keep product concentration steady up to 1 hour 6 minutes 40 seconds with maximum overshoot of 1.9%.