安阳矿区构造煤瓦斯扩散动力学特性实验研究

Experimental study on gas diffusion dynamics characteristics of tectonic coal in Anyang Coalfield

为研究安阳矿区构造煤瓦斯扩散动力学特性,在大众矿、龙山矿和贺驼矿分别采取2个(共6个)煤样。采用工业分析、高压吸附试验和瓦斯解吸试验等方法分析煤样的多元物性参数。运用球形扩散模型,采用Origin软件拟合解吸数据,计算出瓦斯扩散系数。结果表明,大众矿、龙山矿和贺驼矿煤样的挥发分分别为20.16%,12.10%和19.01%,变质程度由高到低为:龙山矿>贺驼矿>大众矿;大众、龙山和贺驼煤样的吸附常数a分别为37.26,52.36,41.30m^3/t,瓦斯吸附能力由大到小为:龙山矿>贺驼矿>大众矿;龙山矿、大众矿和贺驼矿煤样扩散系数分别为9.5675×10^-10,5.2943×10^-10,2.3847×10^-10m^2/s,瓦斯扩散能力由大到小为:龙山矿>大众矿>贺驼矿。表明龙山构造煤瓦斯吸附和扩散能力最强,煤与瓦斯突出危险性最大。

In order to study the diffusion kinetics characteristics of tectonic coal methane in the Anyang mining area,two(a total of six)coal samples were taken in Dazhong Coal Mine,Longshan Coal Mine and Hetuo Coal Mine.The multi-physical parameters of coal samples were analyzed by proximate analysis,high pressure adsorption test and gas desorption test.The spherical diffusion model and the Origin software were used to fit the desorption data to calculate the gas diffusion coefficient.The results showed that the volatiles of Dazhong Coal Mine,Longshan Coal Mine and Hetuo Coal Mine coal samples were 20.16%,12.10%and 19.01%,and the degree of metamorphism was from high to low:Longshan Coal Mine>Hetuo Coal Mine>Dazhong Coal Mine;and the adsorption constants of the Dazhong Coal Mine,Longshan Coal Mine and Hetuo Coal Mine coal samples were 37.26 m^3/t,52.36 m^3/t and 41.30 m 3/t,and the gas adsorption capacity was from large to small:Longshan Coal Mine>Hetuo Coal Mine>Dazhong Coal Mine;and the diffusion coefficient of Longshan,Dazhong and Hetao coal samples were 9.567 5×10^-10 m^2/s,5.294 3×10^-10 m^2/s and 2.384 7×10^-10 m^2/s,and the gas diffusion capacity was from large to small:Longshan Coal Mine>Dazhong Coal Mine>Hetuo Coal Mine.It indicated that the coal adsorption and diffusion capacity of Longshan tectonic coal were the strongest,and the risk of coal and gas outburst was the greatest.