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

24 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

Fingerprint

Flow of solids
Fluid dynamics
Particle size analysis
Fluidized beds
Gases
Particles (particulate matter)
Particle interactions
Flow patterns
Numerical models
Volume fraction
Numerical methods
Experiments
Computer simulation

Keywords

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

Cite this

Wang, Qinggong ; Niemi, Timo ; Peltola, Juho ; Kallio, Sirpa ; Yang, Hairui ; Lu, Junfu ; Wei, Lubin. / Particle size distribution in CPFD modeling of gas-solid flows in a CFB riser. In: Particuology. 2015 ; Vol. 21. pp. 107-117.
@article{57e9c41b2d67473aae642e207f56b314,
title = "Particle size distribution in CPFD modeling of gas-solid flows in a CFB riser",
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.",
keywords = "circulating fluidized bed riser, particle size distribution, CPFD, numerical simulation",
author = "Qinggong Wang and Timo Niemi and Juho Peltola and Sirpa Kallio and Hairui Yang and Junfu Lu and Lubin Wei",
note = "Project code: 73052",
year = "2015",
doi = "10.1016/j.partic.2014.06.009",
language = "English",
volume = "21",
pages = "107--117",
journal = "Particuology",
issn = "1674-2001",
publisher = "Elsevier",

}

Particle size distribution in CPFD modeling of gas-solid flows in a CFB riser. / Wang, Qinggong; Niemi, Timo; Peltola, Juho; Kallio, Sirpa; Yang, Hairui; Lu, Junfu (Corresponding Author); Wei, Lubin.

In: Particuology, Vol. 21, 2015, p. 107-117.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Particle size distribution in CPFD modeling of gas-solid flows in a CFB riser

AU - Wang, Qinggong

AU - Niemi, Timo

AU - Peltola, Juho

AU - Kallio, Sirpa

AU - Yang, Hairui

AU - Lu, Junfu

AU - Wei, Lubin

N1 - Project code: 73052

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - circulating fluidized bed riser

KW - particle size distribution

KW - CPFD

KW - numerical simulation

U2 - 10.1016/j.partic.2014.06.009

DO - 10.1016/j.partic.2014.06.009

M3 - Article

VL - 21

SP - 107

EP - 117

JO - Particuology

JF - Particuology

SN - 1674-2001

ER -