高速昇温法による各種石炭の乾留・ガス化 (II)

水蒸気ガス化の速度と生成ガス組成の関連性

抄録

Eight kinds of coals were pyrolyzed and gasified simultaneously by use of a rapid heating method in nitrogen or steam atmosphere. At 787°C and under the steam pressure of 0.5 atm, the compositions of the gases evolved owing to the gasification and the initial gasification rates were measured in detail. It was first found that the ratio of the amount of CO to that of CO₂ evolved during the reaction, Nco/Nco₂, changed from 0.078 to 5.1 for the coals, and that the ratio, Nco/Nco₂ is almost inversely proportional to the initial gasification rate. Next equations for producing CO and CO₂ were formulated for each coal. The rate of CO₂ production was found to be almost proportional to the initial gasification rate, whereas the rate of CO production was kept almost constant for all coals. This suggests that the difference in the gasification rates is due to the difference in the rate of CO₂ production. The rate of CO₂ production was found to be affected largely by the minerals in the coals.