An energy minimum multiscale model was adjusted to simulate the mesoscale structure of the flue gas desulfurization process in a powder-particle spouted bed and verified experimentally. The obtained results revealed that the spout morphology simulated by the adjusted mesoscale drag model was unstable and discontinuous bubbling spout unlike the stable continuous spout obtained using the Gidaspow model. In addition, more thorough gas radial mixing was achieved using the adjusted mesoscale drag model. The mass fraction of water in the gas mixture at the outlet determined by the heterogeneous drag model was 1.5 times higher than that obtained by the homogeneous drag model during the simulation of water vaporization. For the desulfurization reaction, the experimental desulfurization efficiency was 75.03%, while the desulfurization efficiencies obtained by the Gidaspow and adjusted mesoscale drag models were 47.63% and 75.08%, respectively, indicating much higher accuracy of the latter technique.
. [J]. Frontiers of Chemical Science and Engineering, 2022, 16(6): 909-920.
Xinxin Che, Feng Wu, Xiaoxun Ma. Effect of adjusted mesoscale drag model on flue gas desulfurization in powder-particle spouted beds. Front. Chem. Sci. Eng., 2022, 16(6): 909-920.
superficial particle velocity in dense phase, m?s–1
superficial particle velocity in dilute phase, m?s–1
dense phase superficial slip velocity, m?s–1
dilute phase superficial slip velocity, m?s–1
inter-phase superficial slip velocity, m?s–1
Reynolds number, dimensionless
Schmidt dimensionless number, dimensionless
vapor mass fraction at gas-liquid interface, dimensionless
diffusion coefficient of SO2, dimensionless
liquid membrane mass transfer enhancement factor, dimensionless
Henry coefficient, dimensionless
x, z
Cartesian coordinates, m
Greek letters
drag coefficient, kg?m–2?s–1
gas velocity, m?s–1
particle velocity, m?s–1
density, kg?m–3
viscosity, kg?m–1?s–1
gas voidage, dimensionless
particle voidage, dimensionless
maximum voidage, dimensionless
voidage at minimum fluidization, dimensionless
Subscripts
g
gas phase
p
particle phase
inter-phase
c
dense phase
f
dilute phase
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