TY - JOUR
T1 - A computational particle fluid-dynamics simulation of hydrodynamics in a three-dimensional full-loop circulating fluidized bed
T2 - Effects of particle-size distribution
AU - Zhang, Hang
AU - Lu, Youjun
N1 - Publisher Copyright:
© 2019 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences
PY - 2020/4
Y1 - 2020/4
N2 - A computational particle fluid-dynamics model coupled with an energy-minimization multi-scale (EMMS) drag model was applied to investigate the influence of particle-size distribution on the hydrodynamics of a three-dimensional full-loop circulating fluidized bed. Different particle systems, including one monodisperse and two polydisperse cases, were investigated. The numerical model was validated by comparing its results with the experimental axial voidage distribution and solid mass flux. The EMMS drag model had a high accuracy in the computational particle fluid-dynamics simulation of the three-dimensional full-loop circulating fluidized bed. The total number of parcels in the system (Np) influenced the axial voidage distribution in the riser, especially at the lower part of the riser. Additional numerical simulation results showed that axial segregation by size was predicted in the two polydisperse cases and the segregation size increased with an increase in the number of size classes. The axial voidage distribution at the lower portion of the riser was significantly influenced by particle-size distribution. However, radial segregation could only be correctly predicted in the upper region of the riser in the polydisperse case of three solid species.
AB - A computational particle fluid-dynamics model coupled with an energy-minimization multi-scale (EMMS) drag model was applied to investigate the influence of particle-size distribution on the hydrodynamics of a three-dimensional full-loop circulating fluidized bed. Different particle systems, including one monodisperse and two polydisperse cases, were investigated. The numerical model was validated by comparing its results with the experimental axial voidage distribution and solid mass flux. The EMMS drag model had a high accuracy in the computational particle fluid-dynamics simulation of the three-dimensional full-loop circulating fluidized bed. The total number of parcels in the system (Np) influenced the axial voidage distribution in the riser, especially at the lower part of the riser. Additional numerical simulation results showed that axial segregation by size was predicted in the two polydisperse cases and the segregation size increased with an increase in the number of size classes. The axial voidage distribution at the lower portion of the riser was significantly influenced by particle-size distribution. However, radial segregation could only be correctly predicted in the upper region of the riser in the polydisperse case of three solid species.
KW - Circulating fluidized bed
KW - Computational particle fluid dynamics
KW - Energy-minimization multiscale model
KW - Particle-size distribution
KW - Three-dimensional full-loop simulation
UR - https://www.scopus.com/pages/publications/85068094829
U2 - 10.1016/j.partic.2019.02.004
DO - 10.1016/j.partic.2019.02.004
M3 - 文章
AN - SCOPUS:85068094829
SN - 1674-2001
VL - 49
SP - 134
EP - 145
JO - Particuology
JF - Particuology
ER -