Oxidative Thermal Analysis of Nigerian Coals

Bemgba Bevan Nyakuma

Abstract


Coal remains the most globally abundant fossil fuel for energy recovery. However, lack of data on coal properties, and potential application are hampering clean energy recovery particularly in emerging economies with vast deposits. This study aims to characterize the physicochemical coal fuel properties, rank classification, and oxidative thermal degradation behavior of three newly discovered Nigerian coals from Afuze (AFZ), Garin Maiganga (GMG) and Shankodi-Jangwa (SKJ). The results indicated high Carbon (65 – 75.33 wt. %), Fixed Carbon (21.67 – 41.31 wt. %), and Heating Value (HHV 23.74 – 30.52 MJ/kg). Rank classifications revealed AFZ is a High Volatile Bituminous, GMG - Sub-Bituminous B, and SKJ - High Volatile C Bituminous coal. Coal combustion occurred in three stages; drying, devolatilization and coke formation while coal reactivity increased from; SKJàAFZàGMG. Based on the results AFZ and SKJ are suitable for iron and steel manufacture whereas GMG is suited for power generation.


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