- Title
- Differences in reactivity of pulverised coal in air (O₂/N₂) and oxy-fuel (O₂/CO₂) conditions
- Creator
- Rathnam, Renu Kumar; Elliott, Liza K.; Wall, Terry F.; Liu, Yinghui; Moghtaderi, Behdad
- Relation
- Fuel Processing Technology Vol. 90, Issue 6, p. 797-802
- Publisher Link
- http://dx.doi.org/10.1016/j.fuproc.2009.02.009
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2009
- 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.
- Subject
- oxy-fuel combustion; pulverised coal; char; gasification; reactivity; TGA
- Identifier
- http://hdl.handle.net/1959.13/806732
- Identifier
- uon:7205
- Identifier
- ISSN:0378-3820
- Language
- eng
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