Experimental study on crushing and grading of expanded black rice flour

doi:10.16085/j.issn.1000-6613.2017-1333

Abstract

Abstract: In the process of producing expanded corn flour,the vibrating screening machine is often used to sift the expanded cereal powder after crushing to obtain powder with the demand granularity,but the process is complicated. The air classifier was used to classify the crushed puffed black rice powder to remove coarse powder more than 20 meshes.The variation effect of separating coarse powder more than 20 mesh of puffed black rice powder is studied by changing the speed,secondary air flow and the concentration of air and solid of the classifier is investigated. And the optimum value of the changing parameters is obtained. During the experiment,it is found that when the classifier grade puffed black rice powder,it also shows the grading function. In the process of experiment,the classifier has the effect of pulverizing at the same time of puffed black rice flour. And the crushing mechanism of the classifier on material is discussed. The experimental results show that the change of the rotational speed,gas concentration and secondary air flow of the classifier will significantly affect grading the extruded black rice. When the rotational speed of the classifier is 90r/min,the secondary air volume is 175.60m³/h and the solid concentration is 0.12kg/kg,the classification effect is good. The two grinding action of dispersing cone and classifier wheel expanded black rice flour were verified. Based on the previous work,an industrial production line which uses a classifier and the former crushing equipment was proposed,thus providing an efficient and integrated method for controlling the particle size of puffed grains.

Key words: granular materials, separation, crushing, size distribution

摘要： 在生产膨化谷物粉的过程中，往往会采用振动筛分机对粉碎后的膨化谷物粉进行筛分来得到需求粒度的粉体，过程较为复杂。本实验采用气流分级机对粉碎后的膨化黑米粉进行分级去除20目以下粗的粉体。考察了在改变分级机转速、二次风风量和气固浓度时，对膨化黑米粉分离20目以下粗粉体效果的变化规律，并进一步得出所有参数的最优值。实验过程中出现分级机在分级膨化黑米粉的同时兼具粉碎效果，并对分级机对物料的粉碎机制进行探讨。实验结果表明：分级机转速、气固浓度、二次风风量的改变都会对膨化黑米粉的分级效果产生显著影响，当分级机转速为90r/min、二次风风量为175.60m³/h、气固浓度为0.12kg/kg时，分级效果较好；并验证了分级机中的分散锥和分级轮对膨化黑米粉的二次粉碎作用。在此基础上，提出了一个工业生产线，运用分级机与前端的粉碎设备进行联合，提供一种高效的一体控制膨化谷物类食品粒度的生产方法。

关键词: 颗粒物料, 分离, 粉碎, 粒度分布

CLC Number:

TQ051.8

ZOU Pengcheng, ZHANG Mingxing, HUANG Shenglong, LI Pengchao, LIU Tingnan, CHEN Jundong. Experimental study on crushing and grading of expanded black rice flour[J]. Chemical Industry and Engineering Progress, 2018, 37(05): 1664-1669.

邹鹏程, 张明星, 黄生龙, 李鹏超, 刘侹楠, 陈俊冬. 膨化黑米粉的粉碎分级实验[J]. 化工进展, 2018, 37(05): 1664-1669.

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