以煤矿、冶金、橡胶等行业常见的粉体(铜粉、玻璃微珠、煤粉、氧化铝、石油焦及炭黑)为研究对象,借助静力学和动力学方法,进行粉体流动性表征。通过表征得到粉体物性参数与流动性参数之间的函数关系,发现粉体物性(粒径和密度)对摩擦特性、压缩特性、动力学特性等流动性参数的影响规律不同。构建了不同流动性参数间的关联式,获得了休止角与豪斯纳指数(HR)、HR与压缩性指数的线性关系。对比了Carr指数与Jenike流动函数的结果,发现静力学表征技术能更有效地区分流动性较的好粉体之间的差异,而对于粘性粉体通过剪切测试易获得更全面的特性表征。
Common powders in coal mine,metallurgy,rubber and other industries (copper,glass bead,coal,alumina,petroleum coke and carbon black) were selected as the research objects,the powder flowability were fully characterized by means of statics and kinetics.The functional relationship between the physical properties and the flowability parameters of the powders was obtained.The different properties of the powders such as friction,compression and kinetic properties were affected by the particle size and density differently.The correlation between different flow parameters was constructed,and the linear relationship between the angle of repose and the Hausner ratio(HR) was obtained,as well as the linear relationship between HR and compressibility index.The results of Carr's index and Jenike's flow function shown that the static characterization technique can more effectively distinguish the difference between powders with better flowability,while for adhesive powder,it was easy to obtain more comprehensive characterization through shear test.
[1] 刘一.粉体体系堆积、流动特性及其与颗粒间作用力关系研究[D].上海:华东理工大学, 2017.
[2] 漆海峰, 郭晓镭, 陆海峰, 等.煤粉的流动性测试及评价方法[J].化工学报, 2012, 63(2):433-440.
[3] 谢晓旭, 沈湘林, 汤雪美, 等.粉体流动性特性若干影响因素的研究[J].煤炭学报, 2008, 33(1):85-88.
[4] Bruni G, Lettieri P, Newton D, et al.The influence of fines size distribution on the behaviour of gas fluidized beds at high temperature[J].Powder Technology, 2006, 163(1):88-97.
[5] Saw H Y, Davies C E, Jones J R, et al.Cohesion of lactose powders at low consolidation stresses[J].Advanced Powder Technology, 2013, 24(4):796-800.
[6] Wang Wei, Zhang Jiangsheng, Yang Shi, et al.Experimental study on the angle of repose pulverized coal[J].Particuology, 2010, 8(5):482-485.
[7] Horng Yuan Saw, Clive Davies E, Anthony Paterson H J, et al.Correlation between powder flow properties measured by shear testing and hausner ratio[J].Procedia Engineering, 2015, 102:218-225.
[8] 张鹏.卡尔指数法在评价煤粉粉体特征中的应用[J].中国粉体技术, 2000, 6(5):33-36.
[9] Jenike A W.Storage and flow of solids[D].Salt Lake City, Utah:University of Utah, 1946.
[10] Reg Freeman.Measuring the flow properties of consolidated, conditioned and aerated powders-a comparative study using a powder rheometer and a rotational shear cell[J].Powder Technology, 2007, 174:25-33.
[11] 崔灵, 笹边修司, 清水健司, 等.粉体流动性及喷流性测量方法及其应用[J].中国粉体技术, 2012, 18(1):72-77.
[12] Pablo Juliano, Gustavo V, Barbosa-Cnovas.Food powders flowability characterization:theory, methods, and applications[J].Food Science Technology, 2010, 1:211-239.
[13] Guo Zhiguo, Chen Xueli, Liu Haifeng, et al.Theoretical and experimental investigation on angle of repose of biomass-coal blends[J].Fuel, 2014, 116:131-139.
[14] Geldart D, Abdullah E C, Hassanpour A, et al.Characterization of powder flowability using measurement of angle of repose[J].China Particuology, 2006, 4(3):104-107.
[15] Tomas J.Product design of cohesive powders-mechanical properties, compression and flow behavior[J].Chemical Engineering and Technology, 2004, 27:605-618.
