高惰质组煤微波诱导裂纹特征的研究

Microwave-induced crack characteristics of higher inertinite content coal

  • 摘要: 为拓展微波技术在西部高惰质组煤炭资源精细加工中的应用,以3种西部典型高惰质组煤为研究对象,研究了微波诱导裂纹形成的规律。结果表明:单独的微波辐照对煤粉碎特性影响较小,但可提高进一步机械粉碎的粉碎效率,且微波对不同粒度煤样的响应不同;裂纹数量和微波能量之间存在线性递增的关系;裂纹数量随煤样粒度减小呈现先增大后减小的趋势,且在74~125 μm粒度范围内达到最大。通过扫描电镜和煤岩光片进一步分析裂纹的形态、生长和扩展,可知在微波诱导作用下高惰质组煤存在3种裂纹生成模型,即界面裂纹、组内裂纹、差异性裂纹。

     

    Abstract: In order to expand the application of microwave technique in the refined processing of western coal resources with higher inertinite content, the formation rules of microwave-induced cracks were investigated with three kinds of typical higher inertinite content coal.The results manifested that the separate microwave irradiation has minor influence on the pulverizing characteristics of coal, but could further improve pulverization efficiency.Besides, it has different responses to coal samples with different particle sizes; the number of cracks and microwave energy are linearly increased; with the decrease of particle size, the number of cracks increases at first and then decreases, which reaches its maximum when the particle size varies from 74 μm to 125 μm.From the analysis of the morphology, growing and propagation of cracks by SEM and coal petrography slices, it can be known that higher inertinite content coal has three kinds of crack formation models under microwave induction, i.e., interface crack, in-maceral crack and differentiated crack.

     

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