基于煤尘孔隙结构的润湿性能的研究

Study on wetting ability of coal dust pore structure

通过高性能比表面积分析仪分析了煤尘的孔径分布,通过扫描电镜对所选煤样的孔隙微观孔隙结构进行了研究。根据工业分析中挥发分的含量,哈密煤(HMM)、郭家河煤(GJHM)、榆林煤(YLM)及太西煤(TXM)分别属于褐煤、烟煤、烟煤和无烟煤;4种样品煤均以中孔和大孔为主,其中TXM大孔体积分数最高。而在孔面积累计体积分数中,TXM煤的中孔面积累计分数最高,为98.259 4%,说明TXM作为无烟煤,空隙结构更为复杂,累计孔隙面积大,体现出疏水性,这与所测得的接触角为94.36°,体现出疏水性是相符合的。YLM中孔分数为50.501 0%,大孔体积分数为49.198 4%,YLM的峰很尖很窄,位于1.7～1.9 nm,说明煤尘中有许多微孔,因此体现出较好的亲水性,这与YLM的接触角为67.31°,表现为亲水性是相符的。

The effect of microscopy on wetting was studied through scanning electron.According to the content of volatiles in industrial analysis,HM coal,GJH coal,YL coal and TX coal respectively belongs to lignite,bituminous coal,bituminous coal and anthracite.The four sample coal are mainly constituted of mesopore and macropore.In terms of the cumulative volume fraction of the pore area,the cumulative fraction of the pore area of TX coal is the highest,which is 98.259 4%,indicating that TX,as anthracite coal,has a more complex void structure,with a large cumulative pore area,reflecting hydrophobic property,which is consistent with the measured contact angle of 94.36°.The middle pore fraction of YL coal is 50.501 0%,and the bulk pore volume fraction of YL coal is 49.198 4%.The peak of YL coal is very sharp and narrow,between 1.7 and 1.9 nm,indicating that there are many micropores in the coal dust,which reflects a good hydrophilcity.The contact angle of YLM is 67.31°,which is consistent with hydrophilicity.