Abstract
The behavior of so-called rapid carbon was examined in the hydrogasification of Taiheiyo coal at 1173K and 1-7MPa using a rapid heating apparatus. The apparent amount of the rapid carbon was found to increase with the hydrogen pressure, and reached about 40% of raw coal at 7MPa of hydrogen. When coal was heated rapidly in N_2 or in H_2 without gas flow, the conversion was limited to only 50-55%daf. However, these chars react rapidly in a stream of H_2 to attain a high conversion, meaning that the rapid carbon was kept in the char. The amount of the rapid carbon decreased with increasing the heat-treatment time in nitrogen and disappeared finally after an adequately long treatment time.
