TG-DSCを用いた低温域での石炭の酸化および水分吸着による発熱特性評価

抄録

Heat generation characteristics by oxidation and water adsorption of dry coal were estimated at low temperatures (40–80°C) by using a highly sensitive thermogravimetric analysis and differential scanning calorimetry (TG-DSC) apparatus for three types of coal. Oxidation heat could be adequately estimated even at the low temperature of 40°C, where had not been accurately measured in the past. The relationship between the amount of water adsorption and the water adsorption heat was approximated by a convex upward curve with intercept of 0, which didn’t depend on coal type and ambient temperature. Comparison of the oxidation and water adsorption heat of dry coal showed that the water adsorption heat had a significant influence on the self-heating, especially in the temperature range around 40°C, which was the initial stage of self-heating. In addition, under conditions where dry O₂ or wet N₂ was supplied to dry coal, the total amount of oxidation and water adsorption heat was the largest at the low temperature of 40°C.