20.同位体酸素を用いた石炭の低温酸化と粘結機構

抄録

Caking properties of coal are strongly affected by low-temperature oxidation. In this study, the low-temperature oxidations of four coals ranging from brown coal to bituminous coal were investigated using ^<18>O_2 isotope. During the oxidation of coal, CO (m/z=28,30), CO_2 (m/z=44,46,48) and H_2O (m/z=18,20) were analyzed with a quadrupole mass spectrometer. The gas release profiles were depended on the coal rank. When the oxidized bituminous coal was pyrolyzed at 10℃/min up to 500℃, much more C^<18>O^<18>O, C^<16>O^<18>O, H_2^<18>O were released before softening temperature than those from raw coal. The coal structure change due to desorb oxygen containing gases before softening temperature affects caking properties of coal.