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Experimental study on the scale-up of a multi-ring inclined nozzle spout-fluid bed by electrical capacitance tomography

  • Zhao Chen , Lin Jiang , Xu Yang , Zebing Liu , Rongzheng Liu , Bing Liu , Youlin Shao and Malin Liu EMAIL logo
Published/Copyright: March 14, 2022
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 20 Issue 9

Abstract

Scale-up studies of fluidized beds are important for numerous fields. Fluidization in a multi-ring inclined nozzle spout-fluid bed (MRIN spout-fluid bed) is one of the most critical factors that affect the coating efficiency and uniformity of tri-structural isotropic (TRISO) nuclear particles in the fluidized bed chemical vapor deposition (FB-CVD) process. In this work, the flow pattern similarity principle was proposed to scale up a specially designed spout-fluid bed, which was aimed at maintaining the gas-solid contact efficiency, and was validated by electrical capacitance tomography (ECT) measurements. First, the traditional ECT method was developed for the specially designed MRIN spout-fluid bed according to the filling method. Then, the reconstruction algorithms were updated using the alternating direction multiplier method (ADMM) by introducing optimization constraints. The fluidization laws were investigated for different superficial gas velocities and distributor structures. We found that the gas distributor structure affected the merge point of the jets, which played an essential role in fluidization pattern changes. The statistically-based coefficient of variation (Cv) was proposed to distinguish the different flow patterns. Multi-ring spouting was then selected as a typical flow pattern for good fluidization and mixing, where the Cv ranged from 0.25 to 0.65. Then, the optimal design principles for the enlarged spout-fluid bed gas distributor were obtained. We determined that a smaller nozzle diameter (0.71d 0), larger nozzle spacing (1.12x 0), and slightly inclined angle (1.50θ 0) could improve fluidization, and that nozzle spacing was the most important factor. This study may be beneficial for the industrial design of the FB-CVD process and for the fabrication of high-density nuclear fuel particles. Additionally, it could be presented to a more general audience for scaling-up fluidized beds with a complex distributor, which would be beneficial for the fluidization research community.

Keywords: distributor design; ECT; fluidization; multi-ring inclined nozzle spout-fluid bed; scale-up
Corresponding author: Malin Liu, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, PRC, E-mail:

Funding source: National S&T Major Project http://dx.doi.org/10.13039/501100018537

Award Identifier / Grant number: ZX06901

Funding source: National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809

Award Identifier / Grant number: 91634113

Award Identifier / Grant number: 21306097

Acknowledgments

We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This study was financially supported by National S&T Major Project (Grant No. ZX06901) and National Natural Science Foundation of China (Nos. 91634113, 21306097).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-01-13
Accepted: 2022-02-27
Published Online: 2022-03-14

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/ijcre-2022-0006
Keywords for this article
distributor design; ECT; fluidization; multi-ring inclined nozzle spout-fluid bed; scale-up

Articles in the same Issue

  1. Frontmatter
  2. Articles
  3. Optimizing the two-stage adsorber of NaOH-activated coconut shell carbon for methylene blue removal
  4. Modeling of methane Tri-reforming slurry bubble column reactor via differential evolution optimization method to produce syngas
  5. Effects of flue gas recirculation on nitrogen oxide formation in 1000 MW S-CO2 coal-fired boiler with partial expansion furnace
  6. Experiments on liquid film thickness around Taylor finger
  7. CFD simulation of a swirling vortex cavitator and its degradation performance and pathway of tetracycline in aqueous solution
  8. Three-dimensional carbon architectures with O doping and rich defects for catalytic conversion of polysulfides
  9. Tuning parameters for the synthesis of MIL-53(Al): Mn doped MIL-53(Al) as a high potential catalyst for methanol dehydration
  10. Co-immobilization of glucose oxidase and catalase in porous magnetic chitosan microspheres for production of sodium gluconate
  11. Experimental study on the scale-up of a multi-ring inclined nozzle spout-fluid bed by electrical capacitance tomography
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