CONTROLLING CHAOS BY PERIODIC PERTURBATIONS IN NONISOTHERMAL FLUIDIZED-BED REACTOR

A two-phase model of a nonisothermal fluidized-bed catalytic reactor w ith consecutive exothermic reactions makes it possible to control the chaotic behavior by small parametric perturbations of an input variabl e with suitable frequency and amplitude. By periodic forcing of the fe ed temperature the chaotic behavior of the autonomous system can be co ntrolled and become periodic even for small amplitudes of forcing. For constant frequency with change in forcing amplitudes the behavior of the system alternates between periodic and chaotic regimes via period doubling and period adding bifurcation mechanisms. When the amplitude is fixed, regular patterns also appear with small changes in the forci ng frequency. Appropriate selection of the forcing frequency can impro ve the yield of the desired intermediate component in the consecutive reactions network A --> B --> C.