CFD-DEM analysis of particle polydispersity on the performance of fluidised bed reactor during silane pyrolysis--颗粒学报PARTICUOLOGY

Akshayveer, & Shinde, V. M. (2024). CFD-DEM analysis of particle polydispersity on the performance of fluidised bed reactor during silane pyrolysis. Particuology, 91, 72-87. https://doi.org/10.1016/j.partic.2024.02.007

CFD-DEM analysis of particle polydispersity on the performance of fluidised bed reactor during silane pyrolysis

Akshayveer^a, Vijay M. Shinde^b *

a MS2Discovery Interdisciplinary Research Institute, Wilfrid Laurier University, Waterloo, Ontario, N2L3C5, Canada
b Department of Chemical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, India

10.1016/j.partic.2024.02.007

Volume 91, August 2024, Pages 72-87

Received 30 October 2023, Revised 5 February 2024, Accepted 27 February 2024, Available online 16 March 2024, Version of Record 21 March 2024.

E-mail: vijay.che@iitbhu.ac.in

Highlights

• A comprehensive CFD-DEM model for fluidized bed silane pyrolysis is developed.

• The effect of Si particle polydispersity on fluidisation and deposition rate is investigated.

• Broad particle size distributions (PSDs) expand beds more than narrow PSDs, which fluidize more smoothly.

• Broad PSDs lower net Si fines production and increase Si deposition by 4.3%.

Abstract

A CFD-DEM model is developed for chemical vapour deposition of silane in a fluidized bed reactor to investigate the effect of polydispersity on local phase dynamics, mass and heat transport, as well as the rate of Si deposition. Both gas-phase fines formation and heterogeneous deposition on the seed particle, as well as the scavenging effect for Si particle growth, are incorporated. The method is first validated against the experimentally measured Si deposition rate, percentage of fine production and minimum fluidisation velocity. Subsequently, the properties, primarily particle intermixing, fluidisation behaviour and bubble dynamics along with the deposition process, are analyzed for several polydisperse beds under various operating conditions. The effect of polydispersity of the bed on a fraction of the bubble size, dense phase expansion and interchange coefficient between various phases is thoroughly investigated to establish a correlation with reactor performance. The results show that broad-Gaussian particle size distribution (PSD) exhibits excellent improvement in fluidisation behaviour, resulting in a high deposition rate, and minimum formation of Si fines.

Graphical abstract

Keywords

CFD-DEM method; Chemical vapour deposition (CVD); Particle size distribution; Silicon; Gas-solid fluidized bed

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