Underground coal gasification (UCG): An analysis of gas diffusion and sorption phenomena

This article describes the results of measurements of the gas transport phenomena in coal and strata samples.
The samples were taken from the surroundings of an underground georeactor in the ‘‘Barbara’’
Experimental Mine before and after an in situ underground coal gasification experiment. Measurements
of the coal and strata samples indicate that the UCG process influences the porosity and structure of the
coal seam and the strata surrounding the underground georeactor. Determining parameters such as the
porosity, intrusion volume and diffusion velocity of the gases is crucial to assess the potential for environmental
pollution during the UCG process. Moreover, measuring UCG gas transport in the strata and
the post-process coal may provide useful information on how gas migrates into the surroundings of
the georeactor.
The analysis of the sample properties presented in this study included the total amount of desorbed
product gases and the comparison of adsorption ability of the strata surroundings. The conducted analyses
estimated the amount of the absorbed gases and defined the gases’ potential transport paths in the
georeactor and the surroundings.

本文介绍了煤和地层样品中气体输运现象的测量结果。这些样品取自 "Barbara" 地下“地质反应器“” 的周围环境。
试验矿井在原位地下煤气化试验前后。测量煤和地层的样品表明, 地下煤气化 过程影响到的孔隙度和结构煤层与“地质反应器”地层。确定气体的孔隙度、侵入量和扩散速度等是评估环境潜力的关键参数。地下煤气化过程中的污染。此外, 测量 UCG 气体在地层中的迁移和后处理煤可以提供有用的信息如何迁移到环境中的气体

本文测定了样品性质。包括脱附气体以及地层周围环境吸附能力的比较。估计被吸收的气体的数量和定义气体的潜在的运输路径在“地质反应”和周围的环境。