Dynamic characteristics of bubbling fluidization through recurrence rate analysis of pressure fluctuations--颗粒学报PARTICUOLOGY

Sedighikamal, H., & Zarghami, R. (2013). Dynamic characteristics of bubbling fluidization through recurrence rate analysis of pressure fluctuations. Particuology, 11(3), 282–287. https://doi.org/10.1016/j.partic.2012.09.007

Dynamic characteristics of bubbling fluidization through recurrence rate analysis of pressure fluctuations

Hossein Sedighikamal, Reza Zarghami^*

Multiphase Systems Department, Oil and Gas Processing Centre of Excellence, School of Chemical Engineering, College of Engineering, University of Tehran, P.O. Box 11155/4563, Tehran, Iran

10.1016/j.partic.2012.09.007

Volume 11, Issue 3, June 2013, Pages 282-287

Received 14 December 2011, Revised 15 June 2012, Accepted 25 September 2012, Available online 5 February 2013.

E-mail: rzarghami@ut.ac.ir

Highlights

► RP and RQA are helpful in dynamic characterization of gas-sold fluidized beds.

► Patterns in RP of gas-solid fluidization system reflect dynamic behavior at different time scales.

► RR provides new way to predict transition velocity from bubbling to turbulent fluidization regime.

Abstract

Pressure fluctuations signals of a lab-scale fluidized bed (15 cm inner diameter and 2 m height) at different superficial gas velocities were measured. Recurrence plot (RP) and recurrence rate (RR), and the simplest variable of recurrence quantification analysis (RQA) were used to analyze the pressure signals. Different patterns observed in RP reflect different dynamic behavior of the system under study. It was also found that the variance of RR (σ²_RR) could reveal the peak dominant frequencies (PDF) of different dynamic systems: completely periodic, completely stochastic, Lorenz system, and fluidized bed. The results were compared with power spectral density. Additionally, the diagram of σ²_RR provides a new technique for prediction of transition velocity from bubbling to turbulent fluidization regime.

Graphical abstract

Keywords

Pressure fluctuations; Fluidization; Recurrence rate; Peak dominant frequency; Transition velocity; Power spectral density

文章导读