193.174.19.232Abstract: H. W. Li, T. Wang, C. Chang, B. Sun, W. P. Hong, Y. L. Zhou (2018)

Powder Technology, 339, 958–969p. (2018) DOI:10.1016/j.powtec.2018.08.078

Multi-scale nonlinear analysis of drying dynamics in the mixed pulsed drying fluidized beds

H. W. Li, T. Wang, C. Chang, B. Sun, W. P. Hong, Y. L. Zhou

Abundant information resides in the pressure signal of a fluidized bed, especially when the pressure signal of that bed is mixed with steady flow, and the pulsed flow is more prevalent. In this paper, the authors established a stable and pulsed flow fluidized bed experiment platform. They also collected pressure signals with different times, different frequencies and different gas flow rates in the drying process. The pressure signals were analyzed by two approaches. One is based on the use of the multi-scale complexity entropy causality plane, and the other relies on a recurrence plot. With the drying characteristics of wet particles in the bed and flow pattern, the focus was on influence factors such as time lapse, air intake ratio and pulse frequency on both drying efficiency and the characteristics of complex nonlinear dynamics were analyzed. A study of the micro and macro mechanism of flow characteristics is also presented. The results show that the two approaches (i.e., methods) have a higher accuracy in judging the change of the interaction force between moist particles and the change of flow characteristics. The drying efficiency can be deduced by analysis of the dynamic characteristics of the fluidized bed; thus, the multi-scale complexity entropy causality plane and the structure of the recurrence plot corresponding to the best drying efficiency are obtained. A recommended reference range of the three parameters of a recurrence plot that are good for drying will be presented, which corresponds to the ratio of the stable flow and the pulsed flow.

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