Ignition temperature of coal. 2. Binary coal mixtures

Resumo

The ignition temperature of binary coal mixtures is determined. The mixtures contain coal of different metamorphic development, in various proportions. Systematic deviation of the actual ignition temperature from the values calculated on the basis of the sum rule is observed; the actual ignition temperature is lower. Statistical analysis shows that these deviations are significantly nonrandom. A formula is derived for predicting the ignition temperature of 50 : 50 binary mixtures on the basis of the ignition temperatures of their components. It appears that, in the mixtures, the component with the lower ignition temperature is ignited first. The energy liberated is consumed in the ignition of the less flammable component. That results in ignition of the mixture as a whole.