Abstract
Underground coal gasification is a promising technology for low carbon utilization of coal, while the importance of influencing factors for UCG performance is rarely evaluated quantitatively, which limits the optimization of UCG. In this work, the effects of flow rate, gasification agent, ignition position and initial channel size on temperature distribution and gas products were investigated through ex-situ UCG experiments. The effect of increasing flow rate has two sides, promoting oxidization and cooling down the reaction zone. Compared to air gasification, oxygen gasification features with a higher temperature and reaction zone is closer to upstream; at the same time, effective gas products are obviously more. Compared to ignition at 1/2 L0, the temperature is higher for ignition at 3/4 L0, and the effective gas production time (te) is shorter. When the initial gasification channel size increases from 1 cm to 2 cm, the reaction zone is closer to the upstream, and the te is longer. The analytic hierarchy process (AHP) method is adopted to compare the importance of these factors. Increasing oxygen concentration in the gasification agent is the most effective way to increase the maximum heating value, while increasing the flow rate is the most effective way to increase the te.
Published Version
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