Abstract
Abstract: Five coal samples from Nigeria were characterized by thermogravimetry (TG) analysis. Thermaldecomposition in air (combusti on) and inert (pyrolysis) environment at temperature up to 1000°C classified thecoals as belonging to the low-rank class, within the Lignite and sub-bituminous group. The coals are notcokable alone but could serve as suitable blends with coking coal of higher ranks. The apparent activationenergies of the combustion and pyrolysis processes ranged from 68. 5 to 90.0 kJ molG 1 and 34.1 to 57.2 kJ mol G 1 ,respectively. Key words: Nigerian coal, thermal analysis, burning profile, volatile profile, burn-out temperature, peaktemperature INTRODUCTION of the pyrolysis were determined from the TG/DTG data.Much attention has been focused in recent years n oaccurate determination of the ignition of coal particles.coal as an alternative source of energy. In assessing the The burning profile of coals has been studied y bquality of coal, it is always essential to study the thermal thermogravimetric analysis . It was reported that burningdecomposition processes involved during its conversion profile could provide a valuable, rapid laboratory methodto liquid and gaseous fuel. Thermo-analytical methods of ranking coals in terms of their burnout performance. such as thermogravimetry (TG), differential thermal In southern Nigeria, coal-bearing Formation occursanalysis (DTA) and differential scanning calorimetry within the geological units known as the coal measures(DSC) have proved to play important role in the study of which belong to the Campanian-Maastrichtian age. Boththermal decomposition of solid fuels
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