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化工学报  2012 

颗粒级配对分级机进料管流动特性影响的数值研究

DOI: 10.3969/j.issn.0438-1157.2012.10.014, PP. 3101-3111

Keywords: 超细分级机,气固两相流,颗粒级配,量纲1浓度,颗粒分散

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Abstract:

为了分析颗粒级配对超细分级机进料管内流动特性的影响,利用计算流体力学(CFD)方法,对进料管内气固两相流动进行研究。在对计算模型进行验证的基础上,揭示了不同颗粒级配下进出口压差、颗粒浓度分布及颗粒分散等特性。研究表明:进料管进出口压差随着级配中大粒径颗粒含量的增加而增加。当级配中小粒径含量较大时,颗粒浓度分布均匀,颗粒分散性较好,入口风速、喂料浓度、颗粒密度的改变对颗粒量纲1浓度分布及分散性影响较小。对于大粒径含量较大的级配,随着入口风速的增加,量纲1浓度减小,浓度分布不均匀度减小,分散性提高;随着喂料浓度的增加,量纲1浓度分布变化较小,但浓度分布不均匀度增大,颗粒分散性下降;随着物料密度的增加,浓度分布不均匀度减小,颗粒分散性提高。竖直段轴向截面上颗粒量纲1平均浓度的高低分界线为一定值(Z=0.5m),且与颗粒级配及操作参数的变化无关。

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