Wang QS, Guo S, Sun JH (2009) Spontaneous Combustion Prediction of Coal by C80 and ARC Techniques. Energy &, Fuels 23, 4871-4876. [In English]

Web link: http://dx.doi.org/10.1021/ef900372w

Keywords:

accelerating decomposition temperature, self-reactive substances, gas-chromatography, mass-spectrometry, calorimetry, stockpiles, oxidation, oxygen, model, ftir

Abstract: Many coal fires were caused by spontaneous combustion in coal mines or coal storehouses, which resulted in a great loss and energy wastage. To identify and evaluate the hazardous degree of coal stockpile, a C80 microcalorimeter and accelerating rate calorimeter (ARC) were employed in this work. The coal samples undergo an exothermal process start at 80 degrees C with heat generation of -75.1 J g(-1) (mean value) detected by C80 experiment. The activation energies of the first exothermal process were calculated for the three experiments, and the mean value is 80.76 kJ mol(-1), which is lower than that of obtained from the ARC result, 127.0 kJ mol(-1). Fora 300 tons coal stockpile, the self-heating oxidation temperatures (SHOT) were calculated as 164,60,.90, and 68 degrees C based on the ARC experiment and three C80 experiments, respectively. Further research on the mass effect on SHOT shows that if the coal mass is less than 12 tons, the danger of thermal spontaneous combustion is less. However, if the mass amount is more than 12000 tons, the danger of thermal spontaneous combustion is difficult to avoid even at ambient temperature if no special measures are taken.