Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/806732

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Title
Differences in reactivity of pulverised coal in air (O₂/N₂) and oxy-fuel (O₂/CO₂) conditions
Author/Creator
Rathnam, Renu Kumar;  Elliott, Liza K.;  Wall, Terry F.;  Liu, Yinghui;  Moghtaderi, Behdad
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
The reactivity of four pulverised Australian coals were measured under simulated air (O₂/N₂) and oxy-fuel (O₂/CO₂) environments using a drop tube furnace (DTF) maintained at 1673 K and a thermogravimetric analyser (TGA) run under non-isothermal (heating) conditions at temperatures up to 1473 K. The oxygen concentration, covering a wide and practical range, was varied in mixtures of O₂/N₂ and O₂/CO₂ in the range of 3 to 21 vol.% and 5 to 30 vol.%, respectively. The apparent volatile yield measured in CO₂ in the DTF was greater than in N₂ for all the coals studied. Pyrolysis experiments in the TGA also revealed an additional mass loss in a CO₂ atmosphere, not observed in a N₂ atmosphere, at relatively high temperatures. The coal burnout measured in the DTF at several O₂ concentrations revealed significantly higher burnouts for two coals and similar burnouts for the other two coals in oxy-fuel conditions. TGA experiments with char also revealed higher reactivity at high temperatures and low O₂ concentration. The results are consistent with a char–CO₂ reaction during the volatile yield experiments, but additional experiments are necessary to resolve the mechanisms determining the differences in coal burnout.
Relation
Fuel Processing Technology Vol. 90, Issue 6, p. 797-802
Publisher Link
http://dx.doi.org/10.1016/j.fuproc.2009.02.009
Date
2009
Publisher
Elsevier
Keyword(s)
oxy-fuel combustion;  pulverised coal;  char;  gasification;  reactivity;  TGA
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/806732
Identifier
ISSN:0378-3820
Reviewed
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Subject
"Fuel Processing Technology"
 
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