煤样粒径对煤吸附常数及瓦斯放散初速度的影响

The Effect of Coal Sample Particle Size on Coal Adsorption Constants and Initial Speed of Methane Diffusing

运用Langmuir单分子层吸附理论,对煤在不同粒径条件下吸附瓦斯气体进行了实验研究。利用WY-98A型瓦斯常数测定仪及WFC-2型瓦斯放散初速度测定仪,分别对不同煤样在不同粒径条件下吸附甲烷气体的等温吸附曲线、吸附常数a、b及瓦斯放散初速度△p进行了定性与定量分析,并得出了吸附常数a及放散初速度△p随粒径变化的关系式。结果表明,吸附常数a随粒径出现阶段性的变化,瓦斯放散初速度随粒径变化呈现出对数函数的变化规律。

Adopting the Langmuir monolayer adsorption theory, the experimental research was done for adsorbing methane under the dif- ferent particle size conditions. By using the WY - 98A gas constant determinator and WFC - 2 initial speed determinator of methane diffusing, it made the qualitative and quantitative analysis for the curve of isothermal adsorption, adsorption constants a and b and ini- tial speed of methane diffusing Ap for different coal samples under the different particle size conditions, and obtained the relationship of adsorption constant a and initial speed of methane diffusing Ap with the particle size change. The results showed that adsorption constant a would present periodic change with particle size varying, and the initial speed of methane diffusing Ap took on the variation law of logarithmic function.