Conversion of large coal particles under O2/N2 and O2/CO2 atmospheres - Experiments and modeling
Journal article, 2013
Conversion under O-2/N-2 and O-2/CO2 atmospheres of coal particles of sizes typically used in fluidized bed combustion is studied by means of experiments and modeling. Experiments are conducted for six different fuels in a thermo-gravimetric oven, for different gas atmospheres and temperatures, providing empirical data on devolatilization and char conversion. A model is developed to predict coal conversion (drying, devolatilization, and char conversion), coupling mass and heat transfer and accounting for primary and secondary fragmentation. The validation of the model yields satisfactory agreement between experimental and modeled mass loss curves and conversion rates during devolatilization and char conversion. It is shown that O-2/CO2 mixtures give slightly longer devolatilization times and a decrease of char reactivity compared to O-2/N-2 mixtures.
circulating fluidized-bed
pulverized coal
devolatilization
Coal conversion
TGA
coals
solid
Oxy-coal
secondary fragmentation
australian
char combustion
pollutant emissions
co2 capture
Combustion modeling
oxy-fuel
fuels
Author
I. Guedea
Research Centre for Energy Resources and Consumption
David Pallarès
Chalmers, Energy and Environment, Energy Technology
L. I. Diez
Research Centre for Energy Resources and Consumption
Filip Johnsson
Chalmers, Energy and Environment, Energy Technology
Fuel Processing Technology
0378-3820 (ISSN)
Vol. 112 118-128Subject Categories
Environmental Engineering
Chemical Sciences
DOI
10.1016/j.fuproc.2013.02.023