Modeling and experimental studies on single particle coal devolatilization and residual char combustion in fluidized bed

Devolatilization of a single fuel particle in a fluidized bed under oxy-combustion conditions. Part B: Modeling and comparison with measurements

“…These authors also theoretically predicted the existence of peaks in the fuel particle temperature during devolatilization. However, the particle's center temperature measured in [35] and the 'surface' temperature measured in the present work do not show any peaks during devolatilization. Chern and Hayhurst [29] analyzed this aspect and concluded that the gas carries away much of the heat liberated from the volatiles combustion in the FB, explaining why the particle heating did not increase with the presence of a flame.…”

“…4 (t < 30 s). Sadhukhan et al [35] defined a parameter g as the fraction of the enthalpy from volatiles combustion reaching the fuel particle, and obtained g = 0.52 for a 6 mm diameter SBC particle in air at 1123 K bed temperature in an FB. These authors also theoretically predicted the existence of peaks in the fuel particle temperature during devolatilization.…”

Models accounting for the thermal degradation of combustible materials under controlled temperature ramps

“…In [10], the authors give a long list of possible chemical reactions which may occur during biomass pyrolysis, together with the corresponding kinetic parameters which are given Arrhenius expressions. Then the balance equations are written, see [11], in the case of 3 (main) chemical reactions and 5 gas species, which lead to a coupled system of 8+7 equations (inside the particle and in a boundary layer around the particle).…”

“…In their paper [11], the authors indicate that they used Comsol multiphysics software for the resolution of this problem.…”

Modeling study of oil shale pyrolysis in rotary drum reactor by solid heat carrier

“…Validation of the particle-scale submodel was performed on experimental data [26] for the heating of a single 6 mm coal particle in fluidized bed. Fig.…”