Particle velocity measurement of binary mixtures in the riser of a circulating fluidized bed by the combined use of electrostatic sensing and high-speed imaging

Wenbiao Zhang, Tianyu Wang, Yaoyao Liu, Wenbo Zhan, Chi-Hwa Wang*

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

The flow dynamics of binary particle mixtures in the fluidized bed needs to be monitored in order to optimize the related industrial processes. In this paper, electrostatic sensing and high-speed imaging are applied to measure the velocities of polyethylene and sand particles in the binary particle mixtures in fluidization. Experimental studies were conducted on a lab-scale cold circulating fluidized bed. Correlation function between electrostatic signals from upstream and downstream electrodes placed along the riser shows two peaks that represent transit times for the two types of particles. To verify the above results, high-speed imaging was adopted to capture the flow images of particle mixtures. Particle Image Velocimetry and Particle Tracking Velocimetry algorithms were utilized to process the resulted images in order to measure the velocities of polyethylene and sand particles. The reasons for two-peak correlation functions are illustrated based on the frequency spectrums of the mono-solid-phase electrostatic signals and the velocity difference between polyethylene and sand particles. Finally, comparisons on the velocities obtained from electrostatic sensing and high-speed imaging demonstrate the electrostatic sensor can roughly estimate the particle velocity of binary particle mixtures in the near wall region of the circulating fluidized bed.

Original languageEnglish
Pages (from-to)1159-1170
Number of pages12
JournalPetroleum Science
Volume17
Issue number4
Early online date20 Apr 2020
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Binary mixtures
  • Fluidized bed
  • Electrostatic sensor
  • High-speed imaging
  • FIRING PETROLEUM COKE
  • GROUP-B PARTICLES
  • BIOMASS PARTICLES
  • BOILERS
  • FLOW
  • BEHAVIOR
  • MOTIONS

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