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为了研究甲烷在不同煤阶煤中的吸附、扩散特性及规律,进行了等温甲烷吸附解吸实验。选取新疆阜康矿区长焰煤、潞安高河矿区贫瘦煤2种煤,制成60~80目的煤样,在30℃恒定温度,相同的平衡压力条件下进行吸附扩散实验,对比分析研究甲烷在不同煤阶中的扩散量、扩散率、扩散系数的差异,并解释其产生差异的原因:相同条件下,阜康矿区长焰煤扩散量小于高河矿区贫瘦煤的扩散量,原因是吸附量与煤的比表面积有关,贫瘦煤中微孔和过渡孔发育,其比表面积比长焰煤的更大,有利于吸附的缘故;阜康矿区长焰煤扩散率大于高河矿区贫瘦煤的扩散率,原因是长焰煤中大孔和中孔所占比例大于高变质程度的贫瘦煤,孔隙连通性好、渗透性强,有利于甲烷的扩散;阜康矿区长焰煤扩系数大于高河矿区贫瘦煤的扩散系数;根据公式扩散系数与扩散率成正相关,其规律性与扩散率规律一致。
In order to study the adsorption and diffusion characteristics of methane in coal with different coal rank, the isothermal methane adsorption and desorption experiments were carried out. Two coal types of lean coal in Longyan Coal Mine and Luanhehe Mining Area of Xinjiang were selected to make coal samples of 60-80 mesh. Adsorption and diffusion experiments were carried out under the same equilibrium pressure at 30 ℃. Differences in diffusion, diffusivity and diffusivity in different coal rankings and their differences are explained. Under the same conditions, the diffusion of long-flame coal in Fukang mine is smaller than that of lean coal in Gaohe mine due to adsorption The amount of coal is related to the specific surface area of coal, and the micropores and transitional pores in lean and poor coal are developed. The specific surface area is larger than that of long-flame coal and is favorable for adsorption. The diffusion rate of long-flame coal in Fukang Mine is larger than that of lean coal in Gaohe Mine The reason is that the proportion of macropores and mesopores in long-flame coal is larger than that of high-metamorphic lean lean coal, and the pore connectivity is good and the permeability is strong, which is favorable for the diffusion of methane. The expansion coefficient of long flame coal in Fukang Mine Which is larger than the diffusion coefficient of lean coal in Gaohe mining area. According to the formula, the diffusion coefficient has a positive correlation with the diffusion rate, and its regularity is consistent with the law of diffusion rate.