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Effect of cohesive particle addition on bubbling characteristics of gas-solid fluidized bed: Meso-scale mechanism

  • Polymer, Industrial Chemistry
  • Published:
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Abstract

Due to the small particle size and large specific surface area, the cohesive particles affect the flow characteristics in a gas-solid bubbling fluidized bed. They can easily produce agglomerated and smooth heterogeneous flow under the different cohesive particle addition amounts. The influence of the cohesive particle amount on the bubbling characteristics was experimentally investigated for two typical cases: bed surface agglomerate and well-dispersed with the bed. The images of bubble rise were recorded by digital camera and processed by binarization to track bubble motion and obtained the bubble motion characteristics. An energy minimization multiscale (EMMS) model based on binary particle bubble was expanded to the flow of cohesive particles to reveal the basic mechanism of influence of the cohesive particle. By comparing the results predicted by the model with the experimental data, it is found that the change rules of bubble size and bubble rising speed are similar, which proves the feasibility of the newly developed EMMS model. A study of the structure shows that the addition of cohesive particles increases the size of the bubbles and inhibits the collapse of the bubble due to the reduction of the gas-solid resistance coefficient.

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Abbreviations

a:

acceleration (m·s−2)

a′:

contact area radius of the particles

C f :

factor accounting for the percentage of nominal contact area

d:

diameter [m]

e′:

corrected coefficient of restitution

E:

Youngs modulus of solid

Ec :

contact energy loss [kg·m2s−2]

Fc :

cohesive force [N]

g:

gravitational acceleration [m·s−2]

gs1,s2 :

radial distribution function of binary particles

m0 :

particle mass

Nmse :

suspending energy consumption

Nmsb :

transporting energy consumption

N t :

total suspending and transporting energy consumption

R:

bubble aspect ratio

Re:

Reynolds number

u:

superficial velocity [m·s−1]

ub :

bubble rising velocity [m·s−1]

U s_slip :

superficial slip velocity between particles [m·s−1]

v:

poisson ratio

z0 :

equilibrium separation between two solids

α :

solid fraction

a*es1,es 2 :

maximum solids volume fraction of the binary particle

β:

gas-solid drag coefficient

γ:

solid surface energy per unit contact area

ε:

voidage

ρ :

density [kg·m−3]

μ :

viscosity [Pa·s]

μ*:

dimensionless parameter

χ :

bubbles fraction

b:

bubble phase

e:

emulsion phase

ef:

fluid in emulsion phase

es1:

solid phase particle 1 of emulsion phase

es2:

solid phase particle 2 of emulsion phase

f:

fluid

min:

the minimum value

p:

particle

s1:

solid phase particle 1

s2:

solid phase particle 2

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Acknowledgements

This work is currently supported by the National Natural Science Foundation of China through contract No. 22278332. Supported by the State Key Laboratory of Clean Energy Utilization (Open Fund Project No. ZJUCEU2020020).

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Authors and Affiliations

  1. School of Chemical Engineering, Northwest University, Xi’an, Shaanxi, 710069, China

    Liping Wei & Haoqi Li

  2. Xi’an Key Laboratory of Special Energy Materials, Northwest University, Xi’an, Shaanxi, 710069, China

    Liping Wei

  3. École supérieure de physique et de chimie industrielles de la Ville de Paris, ESPCI, Paris, 75005, France

    Changsong Wu

  4. State Key Laboratory of Multiphase Flow in Power Engineering (SKLMF), Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China

    Youjun Lu

  5. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China

    Kun Luo

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  1. Liping Wei
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  2. Haoqi Li
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Correspondence to Liping Wei or Kun Luo.

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Wei, L., Li, H., Wu, C. et al. Effect of cohesive particle addition on bubbling characteristics of gas-solid fluidized bed: Meso-scale mechanism. Korean J. Chem. Eng. 40, 1529–1539 (2023). https://doi.org/10.1007/s11814-023-1376-4

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  • DOI: https://doi.org/10.1007/s11814-023-1376-4

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