dc.contributor.author | Everson, Raymond C. | |
dc.contributor.author | Okolo, Gregory N. | |
dc.contributor.author | Neomagus, Hein W.J.P. | |
dc.contributor.author | Dos Santos, Jaen-Mari | |
dc.date.accessioned | 2015-05-26T09:31:00Z | |
dc.date.available | 2015-05-26T09:31:00Z | |
dc.date.issued | 2013 | |
dc.identifier.citation | Everson, R.C. et al. 2013. X-ray diffraction parameters and reaction rate modeling for gasification and combustion of chars derived from inertinite-rich coals. Fuel, 109:148-156. [https://doi.org/10.1016/j.fuel.2012.12.043] | en_US |
dc.identifier.issn | 0016-2361 | |
dc.identifier.issn | 1873-7153 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/13871 | |
dc.identifier.uri | https://www.sciencedirect.com/science/article/pii/S0016236112010678 | |
dc.identifier.uri | https://doi.org/10.1016/j.fuel.2012.12.043 | |
dc.description.abstract | An investigation was undertaken to determine the effect of carbon structural properties on the reactivity
of chars derived from inertinite-rich coal. The structures of chars were characterized by X-ray diffraction
and the reactivity evaluation with respect to gasification and combustion involving experimentation and
reaction rate modeling was carried out. The effect of the aromaticity on the intrinsic reaction rates and
associated activation energy for gasification and combustion of chars were determined based on chemical
reaction rate controlled kinetics. Two sets of results were examined consisting of gasification with four
char samples derived from different inertinite-rich coals prepared with a devolitalization temperature
of 900 C (Set 1) and three chars from the same parent coal also rich in inertinites prepared at different
devolitalization temperatures, namely 550, 700 and 850 C (Set 2). It was found that the aromaticity and
fraction of crystalline carbon of the four chars prepared at the same temperature (Set 1) varied in the
ranges 0.85–0.95 and 0.52–0.72 respectively and the chars prepared at different temperatures (Set 2)
in the ranges 0.82–0.92 and 0.44–0.74 respectively. The structural properties of the chars within each
set of results were also very different which required reaction rate modeling for the determination of
intrinsic reactivities. The random pore model with chemical reaction controlling described the reaction
kinetics accurately and it was found that the intrinsic reactivity of the char decreased with increasing aromaticity
while the activation energies decreased (aromaticity < 0.92) which indicated the effect of the
variation of the distribution of aromatic/aliphatic structures on the intrinsic reaction rate. It is proposed
that the aromaticity of chars be used as a predictive index for char reactivity under chemical reaction
controlled conditions. | en_US |
dc.language.iso | en | en_US |
dc.publisher | Elsevier | en_US |
dc.subject | Inertinite-rich coals | en_US |
dc.subject | devolitalization | en_US |
dc.subject | gasification and combustion reactivity | en_US |
dc.subject | X-ray diffraction properties | en_US |
dc.subject | intrinsic reaction rates | en_US |
dc.title | X-ray diffraction parameters and reaction rate modeling for gasification and combustion of chars derived from inertinite-rich coals | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 10168249 - Everson, Raymond Cecil | |
dc.contributor.researchID | 12767107 - Neomagus, Hendrik Willem Johannes P. | |
dc.contributor.researchID | 22006303 - Okolo, Gregory Nworah | |