Abstract
The expansion pattern of the three reaction zones, including oxidation, reduction, and dry distillation zones in the underground coal gasification (UCG) process, is recognized to be different using various gas-injection patterns, on account of which the corresponding stability and syngas components are notably distinguished. The current work carried out UCG model tests in a removable gas-injection point (receded five times). During the stable gasification process, the temperature field map and changes in syngas composition were monitored to determine the area proportions among the three zones and their expansion rates. The differences in the expansion of the three zones between fixed and removable gas-injection points were then explained according to cavity growth. The results showed that the UCG process using a removable gas-injection point exhibited a better performance than that using a fixed point in some aspects, including gasification stability, syngas calorific value, area ratio of the reduction zo...
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