On the basis of a self-designed fluidized bed experimental platform

the Kolmogorov entropy

correlation dimension and Lyapunov exponent were adopted to carry out chaotic analysis on complexity of bubble movement in gas-solid fluidized bed.The flow characteristics of the bubbling regime

slugging regime

turbulent regime and fast fluidized regime were analyzed qualitatively and quantitatively

respectively.The results reveal that

the pressure signal detected at the fluidized bed air hood entrance P0 can transfer the same information as that obtained form measuring point P1 to P10.The bubbling bed's Kolmogorov entropy is about 0.11 to 0.15

which has the greatest chaos degree

while the slugging bed

turbulence bed and fast fluidized bed's Kolmogorov entropy is 0.08 to 0.09

0.09 to 0.11

0.11 to 0.13

respectively

which has a relatively weak chaos degree.The Kolmogorov entropy

the correlation dimension and Lyapunov exponent can be well used to distinguish the fluidization states.It has great significance for understanding the mechanism of fluidized bed flow.