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Energies 2017, 10(9), 1436; https://doi.org/10.3390/en10091436

Experimental Model Development of Oxygen-Enriched Combustion Kinetics on Porous Coal Char and Non-Porous Graphite

1
School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
2
Pusan Clean Coal Center, Pusan National University, Busan 46241, Korea
These authors contributed equally to the work.
*
Author to whom correspondence should be addressed.
Received: 28 August 2017 / Revised: 15 September 2017 / Accepted: 15 September 2017 / Published: 18 September 2017
(This article belongs to the Special Issue Biomass Chars: Elaboration, Characterization and Applications Ⅱ)
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Abstract

The effect of oxygen-enriched air on low-rank coal char combustion was experimentally investigated. In this work, a coal-heating reactor equipped with a platinum wire mesh in the reaction chamber was used to analyze the combustion temperature, reaction time, and reaction kinetics. Increasing the oxygen content of the primary combustion air increased the combustion temperature and decreased the reaction time. As the oxygen content increased from 21% to 30%, the average temperature increased by 47.72 K at a setup temperature of 1673 K, and the reaction time decreased by 30.22% at the same temperature. The graphite sample exhibited similar trends in temperature and reaction time, although the degree of change was smaller because the pores produced during char devolatilization expanded the active surface available for oxidation of the char sample. A mathematical model was used to define the intrinsic kinetics of the reaction. As the oxygen content increased from 21% to 30%, the reaction rate of the low-rank coal char increased. These results were also compared with those of the graphite sample. View Full-Text
Keywords: combustion; oxygen enrichment; low-rank coal char; char oxidation; reaction kinetics combustion; oxygen enrichment; low-rank coal char; char oxidation; reaction kinetics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kim, G.-M.; Kim, J.-P.; Lisandy, K.Y.; Jeon, C.-H. Experimental Model Development of Oxygen-Enriched Combustion Kinetics on Porous Coal Char and Non-Porous Graphite. Energies 2017, 10, 1436.

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