论文部分内容阅读
本文根据苏联、英国关于煤及共生岩层的孔隙结构、吸附能力、吸附动力特性的物理化学研究的最新观点对煤及共生岩层甲烷涌出过程进行了解释。通过实验室及现场研究对煤层的地质环境特别是地质构造破坏程度、成灰物质分布对煤及共生岩层的瓦斯动力特性的影响进行了考察。同时,对伴随瓦斯涌出而产生的温度效应也进行了讨论。实验结果表明:试样中的灰分含量决定试样的吸附能力,甲烷涌出速度取决于试样中单位体积大孔隙数量及其分布。证实了用未配对电子浓度(顺磁中心)表示的煤分子破坏程度与煤的吸附动力特性存在密切的关系。同时表明:试样的这些特征与深孔甲烷涌出速度、煤层钻孔孔壁温降等现象有关。当煤层垂直方向、水平方向的地质构造变化时,在短距离内煤层的上述特性会出现较大变化,因而,它们可以用来确定破坏区内煤层突出危险性及瓦斯涌出量大小。
In this paper, we explain the process of methane emission from coal and symbiotic formations according to the latest research findings of the physicochemical properties of pore structure, adsorption capacity and adsorption kinetics of coal and symbiotic strata in the Soviet Union and the United Kingdom. Through the laboratory and field research, the geological environment of the coal seam, especially the extent of the destruction of the geological structure, the effect of ash distribution on the gas dynamic characteristics of the coal and the symbiotic strata were investigated. At the same time, the temperature effect accompanying gas emission is also discussed. The experimental results show that the ash content in the sample determines the adsorption capacity of the sample, and the methane emission rate depends on the number of large pores per unit volume in the sample and its distribution. It is confirmed that there is a close relationship between the degree of molecular damage and the dynamic adsorption characteristics of coal expressed by the unpaired electron concentration (paramagnetic center). At the same time, it is indicated that these characteristics of the samples are related to the emission rate of deep-hole methane and the temperature drop of borehole wall of coal seam. When the vertical and horizontal geological structure of coal seam changes, the above characteristics of coal seam will change greatly within a short distance. Therefore, they can be used to determine the danger of coal outburst and the amount of gas emission in the damaged area.