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在单一煤体吸附甲烷的基础上,选用山西某煤矿同一进风巷硬软煤,按不同质量比进行分层混合。运用Langmuir单分子层吸附理论,对硬软煤处于不同质量比条件下混合煤样对其吸附特性的影响进行了实验研究。得出吸附量随硬软煤质量比变化的关系曲线、吸附常数a,b随硬软煤质量比变化关系式及瓦斯放散初速度ΔP随硬软煤质量比变化关系式,对瓦斯涌出受硬软煤质量比变化的影响进行了理论分析。分析结果表明软煤质量和其上部硬煤质量近似相等时,吸附常数a及放散初速度ΔP达到最大值,吸附常数b达到最小值。这一发现说明了在此情况下,煤对甲烷的吸附量及其压力均达到最大值,一旦扰动此类煤层,便会形成较大的压力梯度及浓度梯度,发生大量瓦斯涌出,研究结果对煤与瓦斯突出机理提供了理论基础。
On the basis of methane adsorption by a single coal body, soft and hard coal of the same inlet airway in a coal mine of Shanxi is selected and layered mixed according to different mass ratios. Using Langmuir monolayer adsorption theory, the influence of mixed coal samples on the adsorption properties of hard coal at different mass ratios was studied experimentally. The relationship between the adsorption capacity and the mass ratio of soft coal and soft coal was obtained. The relationship between the adsorption constants a and b with the mass ratio of soft and soft coal and the initial velocity of gas evolution ΔP with hard soft coal mass ratio were obtained. The influence of the change of hard soft coal mass ratio is analyzed theoretically. The results show that when the mass of soft coal is approximately equal to the mass of the upper hard coal, the adsorption constant a and initial velocity of diffusion ΔP reach the maximum, and the adsorption constant b reaches the minimum value. This finding shows that in this case, the amount of methane adsorbed by coal and its pressure have reached the maximum, once the perturbation of such coal seams, they will form a larger pressure gradient and concentration gradient, a large number of gas emission, the results of the study The mechanism of coal and gas outburst provides a theoretical basis.