SELF-HEATING POTENTIAL OF COAL INFERRED FROM ELEMENTAL DATA - A CASE-STUDY OF THE WITBANK COALFIELD OF SOUTH AFRICA
作者： Ofentse M Moroeng , R James Roberts , John P Bussio , Roger D Dixon , None
DOI: 10.1021/ACS.ENERGYFUELS.7B02109
关键词: Spontaneous combustion 、 Vitrinite 、 Inertinite 、 Mineralogy 、 Chemistry 、 Environmental chemistry 、 Maceral 、 Coal 、 Fraction (chemistry) 、 Petrography 、 Composition (visual arts)
摘要: Initiation of self-heating is governed by a coal’s ability to oxidize at low temperatures. Aliphatics undergo low-temperature oxidation and are the main constituents vitrinite. Conversely, chief inertinite, aromatics, elevated In this study, published elemental data for Witbank Coalfield used calculate H/C ratio aromatic fraction (fa). The parameters correlated with petrographic composition. An increased proportion aliphatics in vitrinite suggests that it has higher heat generating capacity (HG) temperatures than inertinite similar rank. When retention (HR) exceeds HG, initiates, resulting aromatics. Sustained self-heating, initiated macerals, may trigger ignition. Spontaneous combustion vitrinite-poor coals indicative coal body high HR. For coals, likelihood classed as high- low-risk corresponding to...
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