Fuzzy logic applied to reboiler temperature control

This paper is a case study of applying the Fisher-Rosemount Systems´ intelligent fuzzy logic controller (IFLC) to a production distillation column reboiler temperature controller. A performance comparison between the original proportional, integral, and derivative (PID) controller and the IFLC is illustrated. The goals established for trying the fuzzy logic controller were to eliminate the temperature overshoot, reduce fuel and air valves cycling, and increase yields of the primary product. Analysis of the process operations show that the first two have been achieved. The third goal, increased product yield, appears likely but will require a long term study for verification