Particle size distribution in CPFD modeling of gas-solid flows in a CFB riser

Qinggong Wang, Timo Niemi, Juho Peltola, Sirpa Kallio, Hairui Yang, Junfu Lu (Corresponding Author), Lubin Wei

Research output: Contribution to journalArticleScientificpeer-review

31 Citations (Scopus)

Abstract

A computational particle fluid dynamics (CPFD) numerical method to model gas-solid flows in a circulating fluidized bed (CFB) riser was used to assess the effects of particle size distribution (PSD) on solids distribution and flow. We investigated a binary PSD and a polydisperse PSD case. Our simulations were compared with measured solids concentrations and velocity profiles from experiments, as well as with a published Eulerian-Eulerian simulation. Overall flow patterns were similar for both simulation cases, as confirmed by experimental measurements. However, our fine-mesh CPFD simulations failed to predict a dense bottom region in the riser, as seen in other numerical studies. Above this bottom region, distributions of particle volume fraction and particle vertical velocity were consistent with our experiments, and the simulated average particle diameter decreased as a power function with riser height. Interactions between particles and walls also were successfully modeled, with accurate predictions for the lateral profiles of particle vertical velocity. It was easy to implement PSD into the CPFD numerical model, and it required fewer computational resources compared with other models, especially when particles with a polydisperse PSD were present in the heterogeneous flow.
Original languageEnglish
Pages (from-to)107-117
JournalParticuology
Volume21
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • circulating fluidized bed riser
  • particle size distribution
  • CPFD
  • numerical simulation

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