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Conversion of large coal particles under O2/N2 and O2/CO2 atmospheres - Experiments and modeling

I. Guedea ; David Pallares (Institutionen för energi och miljö, Energiteknik) ; L. I. Diez ; Filip Johnsson (Institutionen för energi och miljö, Energiteknik)
Fuel processing technology (0378-3820). Vol. 112 (2013), p. 118-128.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Coal conversion, TGA, Combustion modeling, Oxy-coal, circulating fluidized-bed, oxy-fuel, secondary fragmentation, australian, coals, char combustion, pulverized coal, pollutant emissions, solid, fuels, co2 capture, devolatilization



Denna post skapades 2013-06-27. Senast ändrad 2016-07-13.
CPL Pubid: 179398

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik

Ämnesområden

Kemi
Naturresursteknik

Chalmers infrastruktur