Changes on methane concentration after CO2 injection in a longwall gob: A case study
作者： Shengyong Hu , Zhen Li , Guorui Feng , Guang Xu , Tongqiang Xia
DOI: 10.1016/J.JNGSE.2016.01.012
关键词: Carbon dioxide 、 Extraction (chemistry) 、 Chemistry 、 Coal mining 、 Greenhouse gas 、 Methanation 、 Volume (thermodynamics) 、 Methane 、 Environmental engineering 、 Coal 、 Energy Engineering and Power Technology
摘要: Abstract Large areas of gob containing a considerable amount methane in China are produced annually. The practice injecting CO 2 into gobs to extract could not only reduce the greenhouse gas emission, but also exploit clean resource. In this paper, an experimental apparatus was built conduct simulation gob. results show that volume can be orderly divided three zones from bottom top: residual coal zone (RCZ), transitive (GTZ) and enrichment (MEZ). concentration exhibits increasing trend before after injection, MEZ is obviously higher than RCZ GTZ. After decreases, while significantly increases. Meanwhile, would decrease as total injected increases increase Based on results, new in-situ technology proposed applied Yiyuan mine improve its extraction by arranging highly-located roadway field testing shows 22% for with original low 20%–25%.
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