(95y) Real-Time Interpretation of Chaotic Characteristics and Instability of Dense Gas Solid Fluidization

Sheng, C. - Presenter, National University of Defense Technology (NUDT)
Duan, C., China University of Mining and Technology
Dong, L., China University of Mining and Technology
Zhao, Y., China University of Mining and Technology
The establishment of instability monitoring system targets at analyzing the chaotic characteristics and evaluating the instability of the fluidization process for dense gas solid fluidization. Experimental pressure fluctuation and pressure drop measurements were interpreted from dense gas solid fluidization system based on chaotic time-series analysis. The pressure fluctuation signals were filtered in terms of attenuating the noise signals. The filtered pressure signals were analyzed with respect to attractor reconstruction. Based on the reconstructed
attractor, the maximum Lyapunov exponent and entropy were investigated and estimated under different bed heights and air velocities. Results show that the maximum Lyapunov exponents udner different bed heights and air velocities are positive, which indicates that dense gas solid fluidization exhibits chaotic characteristics. With the increase of bed height, estimated entropy of dense gas solid fluidization increases with the increase of bed height under identical air velocity, while it varies slightly with the increase of air velocity when the air
velocity alters from minimum fluidization velocity to 1.36 times of the minimum fluidization velocity.