Conversion of large coal particles under O2/N2 and O2/CO2 atmospheres - Experiments and modeling
Artikel i vetenskaplig tidskrift, 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

Författare

I. Guedea

Research Centre for Energy Resources and Consumption

David Pallarès

Chalmers, Energi och miljö, Energiteknik

L. I. Diez

Research Centre for Energy Resources and Consumption

Filip Johnsson

Chalmers, Energi och miljö, Energiteknik

Fuel Processing Technology

0378-3820 (ISSN)

Vol. 112 118-128

Ämneskategorier

Naturresursteknik

Kemi

DOI

10.1016/j.fuproc.2013.02.023