1988 Volume 67 Issue 3 Pages 172-180
The characteristics of air-blown coal gasification has been studied in a process development unit of an entrained-bed gasifier. Taiheiyo and Ermelo coals were used in this work. Comparing the experimental results obtained in the two-stage gasification method, it was confirmed that there is an appropriateair distribution ratio in the two-stage method which results in the reduction of the difference in the carbon conversions of Taiheiyo and Ermelo coals. Carbon conversion shows a linear relationship with the ratio of total supplied oxygen to the carbon contents in the coals.
The ratio of the experimental value, ηg (cold gas efficiency), to the theoretical value, η*g was introduced as a performance index of the gasifier. On the basis of a slag flow temperature comparison, it was concluded that only a small difference existed in the performance indexes of the air-blown and the oxygen-blown gasifications in this gasifier.
