基于X射线衍射实验的堆垛结构对煤尘润湿性的影响

发布时间：2018-08-29 13:48

【摘要】：为了研究煤尘堆垛结构对其润湿性的影响,对从全国选取的10种不同变质程度煤样进行X射线衍射实验,结合液-固界面动态接触角测定结果,分析得到煤尘微晶参数与其润湿性之间的关系.结果表明,无机矿物种类随着煤样变质程度的提高逐步减少,且原生矿物种类数量越多,润湿性则越好,次生矿物对煤尘润湿性的影响则较小.变质程度高的煤种晶态成分较多,芳晶结构单元较大,芳香环缩合度较高;而中低变质程度煤种的非晶态成分较多,往往是一些亲水性的烷基小分子侧链、含氧官能团等.随着堆砌度和延展度不断升高,面网间距逐渐减小,煤尘润湿性逐步变差.当煤尘X射线衍射的堆砌度为18.5 nm,延展度为41.7 nm,面网间距为0.898 nm时,煤尘润湿性最佳,其X射线衍射微晶参数越接近上述组合,润湿性越好.
[Abstract]:In order to study the effect of coal dust stacking structure on its wettability, 10 kinds of coal samples with different degrees of metamorphism were tested by X-ray diffraction, combined with the dynamic contact angle of liquid-solid interface. The relationship between the microcrystalline parameters and wettability of coal dust was obtained. The results show that the types of inorganic minerals decrease gradually with the increase of metamorphic degree of coal samples, and the more the number of primary minerals, the better the wettability, and the less the influence of secondary minerals on the wettability of coal dust. The coal with high degree of metamorphism has more crystalline composition, larger aromatic crystal structure unit and higher condensation degree of aromatic ring, while the low metamorphic coal has more amorphous components, which are often hydrophilic alkyl small molecular side chains, oxygen-containing functional groups and so on. With the increasing of piling and extensibility, the space between surface nets decreases and the wettability of coal dust becomes worse. The wettability of coal dust is the best when the piling degree of coal dust X-ray diffraction is 18.5 nm, and the interfacial spacing of coal dust is 0.898 nm. The closer the X-ray diffraction microcrystalline parameter is to the above combination, the better the wettability of coal dust is.
【作者单位】：山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;安徽理工大学煤矿安全高效开采省部共建教育部重点实验室;澳大利亚联邦科学与工业研究组织能源研究分院;
【基金】：国家自然科学基金资助项目(U1261205,51474139,51204103) 中国博士后科学基金资助项目(2015M570602) 山东科技大学杰出青年科技人才支持计划资助项目(2014JQJH106) 山东煤炭安全高效开采技术与装备协同创新中心资助项目煤矿安全高效开采省部共建教育部重点实验室开放研究基金资助项目(JYBSYS2014105) 2014年度青岛市黄岛区科技资助项目(2014--1--30)
【分类号】：TD714.1

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