In this study, a dynamic 2D model for a CFB combustor has been developed which integrates and simultaneously predicts the hydrodynamics,
heat transfer and combustion aspects. Hydrodynamic model used in this study has been developed in our previous studies. Simulation model
calculates the axial and radial distribution of voidage, velocity, particle size distribution, pressure drop, gas emissions and temperature at each
time interval for gas and solid phase both for dense bed and for riser. The model has been validated against the data from a pilot-scale 50 kW CFB
combustor and an industrial-scale 160 MW CFB combustor. A sensitivity analysis is carried out using the model to examine the effect of different
operational parameters and coal properties on bed temperature and the overall CO, NOx and SO2 emissions from the combustor. As a result
of parametric study, it is observed that by increasing bed operational velocity or excess air ratio, bed temperature decreases and CO emission
increases. Bed operational velocity has a more significant effect on CO emission than to bed temperature. Another effect of increasing excess air
is the decrease of SO2 and NOx emissions. However, NOx emission increases with the operational bed velocity while SO2 emission decreases.
© 2007 Elsevier Masson SAS. All rights reserved.