Research on the underground gasification of lignite through an oxygen enrichment process: insights from experimental study and Aspen Plus process model.

6,27,28 Furthermore, the impact of pressure on gasification products, particularly methane, is markedly significant throughout the gasification process. 29 It is evident that the gasification efficiency is influenced by either the gasification environment or the characteristics of the coal itself, presenting a significant issue for further consideration.

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In addition, at the end of the experiment, the temperature of each temperature measurement device still maintained an increasing trend, indicating that an increase in the oxygen concentration in the gasification agent increased the intensity of the gasification reaction. 3.2 Gasification process characteristics of pressure The pressure change curve of underground lignite gasification in the gasifier during the simulation process is shown in Fig. 5 .

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