Comparison of PSO-PID, FLC and PID in a circulating fluidized bed boiler

Bed temperature is one of the most important parameters in a circulating fluidized bed boiler. Because combustion efficiency increases with rising of bed temperature and also harmful emissions are affected by bed temperature. Classical PID controller can´t give fast response to instant changes in boiler. So modern control methods must be used for bed temperature control of circulating fluidized bed boiler. In this study PSO-PID (Particle Swarm Optimization based PID), FLC which are modern controllers, and classical PID controller are used for controlling bed temperature of a circulating fluidized bed boiler and they are compared. Simulation results show that settling time in PSO-PID controller is lower than the other controllers. PSO-PID decreases overshoot like FLC but in classical PID controller overshoots are the biggest. In FLC there are no overshoot. So if overshoot isn´t wanted, a FLC must be used and if short settling time is wanted, a PSO-PID controller must be used.