Improved reactivity of large coal particles by K₂CO₃ addition during steam gasification
2013
Coetzee, Sansha | Neomagus, Hein W.J.P. | Bunt, John R. | Everson, Raymond C.
In this study, the excess solution impregnation method was used to impregnate large coal particles (5 and 10mm) with K₂CO₃, and the effect of the additive on steam gasification reactivity was investigated. A washed bituminous, medium rank-C Highveld coal, with an ash content of 12.6wt.% (air-dried basis), was used for experimentation. The excess solution method was used to impregnate coal particles with the selected additive, K₂CO₃, and results from XRF analysis indicated that the potassium loading increased from 0.05wt.% (raw coal) up to 0.83wt.% (impregnated coal), on a coal basis. The potassium-impregnated large coal particles were used for low temperature (800–875°C) steam gasification experiments. Results obtained for the reactivity of the parent coal were compared to that of the impregnated coal, which indicated that the addition of K₂CO₃ increased the reaction rate of large coal particles by up to 40%. It was also found that the addition of K₂CO₃ decreased the activation energy, from 191kJ/mol (raw coal) to 179kJ/mol (impregnated coal).
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