Graphical '/> Investigation on the structure evolution of pre and post explosion of coal dust using X-ray diffraction
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Investigation on the structure evolution of pre and post explosion of coal dust using X-ray diffraction

机译：X射线衍射研究煤粉爆炸前后的结构演变

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Graphical abstractDisplay OmittedHighlights•Coal dust with higher volatile matter or lower vitrinite reflectance shows stronger explosion severity.•Coal dust with more much developed porous structure present higher explosion reactivity.•The 002 band tends to be blunt and peak intensity is relatively reduced with decreasing of coal ranks.•Explosion treatments have significant impacts on the ordering of coal aggregate structure.AbstractTo reveal the effects of coal dust explosion on its crystal structures evolution, the micro structure of six different rank of coal dust and its explosion solid products had been studied using 20 L explosion sphere vessel and X-ray diffraction (XRD) analyzer. The correlations between structural parameters and explosion severity had been analyzed detailed. Results show that coal dusts with higher volatile matter contents (Vdaf), lower vitrinite reflectance (Ro,max) and less ash contents (Aad) show stronger explosion severity. The effects of vitrinite reflectance (Ro,max) on the explosion severity parameters present the same role as the influence of volatile matter contents (Vdaf). Coal dusts with developed porous structure (SBETandVBJH) also present higher explosion reactivity. Interestingly, six selected coal samples present the strongest explosion severity at the same optimum explosion concentration (250 g/m3). For the different rank raw coal, the difference of the shape and intensity of 002 peak varies greatly. With the decreasing of coal ranks, the 002 band tends to be blunt and the peak intensity is relatively short. Quantitative analysis show that the lattice parameters (La,Lc, andNavg) of six coal samples are found to relatively increase with increasing vitrinite reflectance (Ro,max), whereas thed002slightly decreases. The explosion treatments have significant effects on the ordering of coal aggregate structure. Compared with raw coal sample, the relative intensity of 002 bands at about 26° is reduced by the explosion treatments, which would increase the degree of graphitization of the explosion solid products. With the increasing of explosion pressure, the relative intensity of 002 peak would be gradually decreased. However, the shape of 002 peak for the explosion solid products tend to be more asymmetric and blunter than that at lower explosion conditions. Compared with the parent coals, the inter-layer spacingd002,LcandNavgof all explosion products would be slightly reduced correspondingly. However, there is no clear rule for the evolution ofLaparameter. Moreover, calculated aromaticity (fa) of the coals ranges from 0.2208 to 0.6883, which is linear positively increased with the coal maturity by vitrinite reflectance.
机译： 图形摘要 省略显示 突出显示 • 挥发分较高或镜质反射率较低的煤尘显示出更强的爆炸强度。 • 煤尘中多孔结构更加发达爆炸反应性更高。 • 随着煤等级的降低，002带趋于钝化，峰值强度相对降低。 • 爆炸处理对煤骨料结构的排序有重大影响。 摘要 为揭示煤尘爆炸对其晶体结构演变的影响，研究了六种不同等级的煤尘及其爆炸固体产物的微观结构。使用20 L爆炸球容器和X射线衍射（XRD）分析仪。详细分析了结构参数与爆炸强度之间的关系。结果表明，煤灰中挥发物含量较高（ V daf ），镜质体反射率较低（ R o，max ）并减少灰分（ A ad ）显示出更强的爆炸严重性。镜质体反射率（ R o，max ）对爆炸强度参数的影响与影响相同挥发性物质含量（ V daf ）。具有多孔结构（ S BET 和 V < ce：inf loc =“ post”> BJH ）也具有更高的爆炸反应性。有趣的是，在相同的最佳爆炸浓度（250μg/ m 3 ）下，六个选定的煤样品呈现出最强的爆炸强度。对于不同等级的原煤，002峰的形状和强度的差异变化很大。随着煤等级的降低，002带趋于钝化，峰值强度相对较短。定量分析表明，晶格参数（ L a ， L c 和 N avg ）发现六个煤样品随镜质体反射率的增加而相对增加（ R o，max ），而：italic> d 002 略有减少。爆炸处理对煤骨料结构的排序有重要影响。与原煤样品相比，爆炸处理降低了002谱带在约26°的相对强度，这会增加爆炸固体产物的石墨化程度。随着爆炸压力的增加，002峰的相对强度将逐渐降低。但是，与较低爆炸条件下的爆炸相比，爆炸固体产物的002峰形状更不对称且更钝。与母煤相比，层间距 d 002 ， L c 和 N avg 所有爆炸产物的数量将相应减少。但是，对于 L a 参数的演变没有明确的规则。此外，煤的计算芳香度（ f a ）范围为0.2208至0.6883，其随镜质体反射率随煤成熟度线性增加。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第5期|1162-1172|共11页
  • 作者

    Qingzhao Li; Qinglin Tao; Chuangchuang Yuan; Yuannan Zheng; Guiyun Zhang; Junfeng Liu;

  • 作者单位

    Key Laboratory of Gas and Fire Control for Coal Mines of Ministry of Education, China University of Mining and Technology,School of Safety Engineering, China University of Mining and Technology;

    School of Safety Engineering, China University of Mining and Technology;

    School of Safety Engineering, China University of Mining and Technology;

    School of Safety Engineering, China University of Mining and Technology;

    School of Safety Engineering, China University of Mining and Technology;

    School of Safety Engineering, China University of Mining and Technology;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Coal dust; Explosion products; Microstructure; XRD; Quantitative analysis;

    机译：煤粉尘;爆炸产物;微观结构;XRD;定量分析;

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