To reveal coal-dust wetting mechanism and improve the effect of dust suppression,the dy-namic wetting behavior of coal particles under the influence of particle size is studied.The coal samples from Sijiazhuang are crushed and screened into five different coal particles with different particle sizes.The pore characteristics with different particle sizes are represented by low-temperature liquid nitrogen method and mercury intrusion porosimetry method.The fractal characteristics of coal particles with dif-ferent particle sizes are analyzed.The results show that with the decrease of particle size,the proportion of pore size increases.When the particle size is too large or too small,the fractal characteristics of transi-tion pores and micropores are not transparent.The T2 spectrum reflects three states of pore-adsorbed wa-ter,coal surface-adsorbed water and free water in the wetting process.The spatio-temporal evolution characteristics of water are quantitatively analyzed,and the process of wetting coal particles is divided into three stages:coal surface diffusion,wetting coal pores and continuous diffusion.The clarity of the wetting stage can provide a paradigm for improving the coal dust wetting efficiency.
关键词
粒径/动态润湿/孔隙结构/低场核磁共振
Key words
particle size/dynamic wetting/pore structure/low-field nuclear magnetic resonance
维普
万方数据