超净煤制备过程中絮团生长的多重分形行为研究

Multifractal behavior of flocculation growth in ultra-clean coal preparation process

为了研究絮团形成过程中的多重分形行为,对机械能输入过程中絮团的生成和碎裂过程进行图像采集和分析。通过分析多重分形图谱及其特征参数的变化趋势,针对絮团的生长规律、絮团形态进行了定量化的描述。结果表明,随着絮团的生长和碎裂,多重分形图谱的形态发生规律性偏移,描述絮体分布均匀性的多重分形谱宽Δα呈现先增加后减小的变化趋势。描述絮团最大和最小概率单元数目比例关系的Δf(α)显示体系中细粒颗粒占主导地位,绝对值先减小后增加,表明细颗粒先减少后增加。

To study the multifractal behavior during the formation process of ultra-clean coal flocculation through mechanical energy input,the images describe the generation and fragmentation of flocculation are gathered and analyzed.By analyzing the variation trend of the multifractal spectrum and its characteristic parameters,the growth law and the morphology of the flocculation are quantitatively described.The results show that with growth and fragmentation of flocculation,the morphology of the multifractal spectrum occurs regularity migration,multifractal spectrum width Δα which describes the distribution uniformity of flocculation first increases and then decreases.The numerical value of Δf（α） which describes the proportional relationship between the maximum and minimum probability unit of flocculation shows the dominant position of fine particles in the system.The changing trend of absolute value of Δf（α） indicates fine particle number and the growth of the flocculation change law.