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

Gyeong-Min Kim, Jong-Pil Kim, Kevin Yohanes Lisandy and Chung-Hwan Jeon
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Gyeong-Min Kim: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Jong-Pil Kim: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Kevin Yohanes Lisandy: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Chung-Hwan Jeon: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea

Energies, 2017, vol. 10, issue 9, 1-14

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.

Keywords: combustion; oxygen enrichment; low-rank coal char; char oxidation; reaction kinetics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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