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Structural analysis of chars generated from South African inertinite coals in a pipe-reactor combustion unit

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dc.contributor.author Bunt, John Reginald
dc.contributor.author Malumbazo, N.
dc.contributor.author Wagner, N.J.
dc.contributor.author Van Niekerk, D.
dc.contributor.author Assumption, H.
dc.date.accessioned 2012-10-08T08:41:24Z
dc.date.available 2012-10-08T08:41:24Z
dc.date.issued 2011
dc.identifier.citation Malumbazo, N et al. 2011. Structural analysis of chars generated from South African inertinite coals in a pipe-reactor combustion unit. Fuel processing technology, 92(4):743-749. [ http://www.journals.elsevier.com/fuel-processing-technology/] en_US
dc.identifier.issn 0378-3820
dc.identifier.uri http://hdl.handle.net/10394/7451
dc.description.abstract An inertinite-rich medium rank C bituminous South African coal was utilized to generate chars in a pipe-reactor combustion unit. This unit generates chars at atmospheric pressures and temperature was controlled with N2 to a maximum of 1250 °C. Chemical structural changes were investigated at different reaction zones identified in the pipe-reactor combustion unit. A combination of FTIR, XRD and Solid State NMR experiments were used to characterize the coal/char/ash fractions produced in the reactor. These techniques revealed that the coal structure becomes disordered in the drying zone as well as in the beginning of the pyrolysis zone in the reactor. As the temperature increases towards the base of the reactor the coal structure becomes more ordered and well aligned until char is formed and converted. Major structural changes were seen to occur in the drying to the pyrolysis zones. Structural changes within the molecular core were observed with FTIR and XRD results obtained from samples taken from the drying zone to the combustion zone. However, 13C CP/MAS and dipolar dephasing experiments were not able to corroborate these structural changes of the coal/char/ash fractions produced in the reactor occurring in the reduction and combustion zones. en_US
dc.description.uri http://dx.doi.org/10.1016/j.fuproc.2010.09.009
dc.language.iso en en_US
dc.publisher Elsevier Science en_US
dc.subject Coal structure en_US
dc.subject pyrolysis en_US
dc.subject structural ordering en_US
dc.subject aromaticity en_US
dc.subject 13C solid state NMR en_US
dc.title Structural analysis of chars generated from South African inertinite coals in a pipe-reactor combustion unit en_US
dc.type Article en_US


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