不同粒径与含水率的烟粉颗粒流动性及影响因素
Tobacco Science & Technology（2020）
Abstract
为了揭示烟粉颗粒流动性的影响因素,采用HR法与Jenike剪切法,对不同粒径与含水率的烟粉进行了流动性分析,并从微观结构入手分析其对流动性影响.结果表明:①烟粉孔隙结构不发达,比表面积均在1 m2/g左右,累积孔体积仅为0.002 cm3/g,最可几孔径为介孔(2～50 nm).小颗粒的聚团行为表现为黏聚力较大,大颗粒表面粗糙表现为内摩擦角相对偏大.②烟粉属于MolerusⅢ类粉体.不同粒径烟粉的流动函数范围为2～8,75μm是烟粉颗粒处于易流动区的最小尺寸.含水率的增加降低了烟粉的流动函数.③粒径75μm以上的烟粉颗粒,压缩性指数小于30,HR指数小于1.4,流动性良好.而粒径75μm以下的烟粉,压缩性指数介于30～50之间,HR指数介于1.4～2.0之间,流动性差.
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