摘要
通过煤层注气物理模拟试验,对0.6、1.0、1.4 MPa压力下的注氮气置驱煤层甲烷的机理进行分析。结果表明:注气试验前期,氮气被煤体吸附并置换出煤中甲烷,随着氮气突破腔体,氮气的驱替作用也开始宏观表现出来,试验过程中的宏观现象表现出了注入氮气的置换、驱替作用。从微孔隙中甲烷的解吸角度来讲,注入氮气的稀释扩散作用也是注氮气置驱煤中甲烷的机理之一。通过对注氮气置驱甲烷的机理进行分析,总结出了注入弱吸附性气体置驱煤层甲烷的机理。
Through the physical simulation experiments of gas injection in coal seam, the mechanism of injecting nitrogen to displace coal seam methane under pressure of 0.6 MPa, 1.0 MPa, 1.4 MPa is analyzed. The analysis of experiment resuits show that at the early stage of gas injection experiment, the injected nitrogen is adsorbed by coal and the methane in coal is replaced. When the injected nitrogen breaks through the box, the displacement effect of nitrogen appears. The macroscopic phenomena of the experiment show the displacement and replacement effect of injected nitrogen. But starting from the methane desorption of micro pore, dilution and diffusion effect could be one of the mechanisms of nitrogen injection to displace coal seam methane. Through the analysis of injecting nitrogen to displace coal seam methane, the mechanism of injecting weak adsorption gas to displace coal seam methane is concluded.
出处
《煤矿安全》
CAS
北大核心
2017年第2期145-148,共4页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51174081)
河南理工大学博士基金资助项目(B2012-89)
关键词
煤层注氮气
机理分析
置换解吸
驱替
稀释扩散
nitrogen injection of coal seam
mechanism analysis
replacement desorption
displacement
dilution and diffusion
