搅拌槽中粉体混合性能的实验研究

发布时间：2018-04-09 23:22

本文选题：螺带桨　切入点：粉体　出处：《北京化工大学》2015年硕士论文

【摘要】：本文在直径为0.476 m的标准椭圆封底的透明有机玻璃槽内,对粉体搅拌进行了功率特性和混合性能的研究。实验过程中以树脂颗粒与玻璃珠颗粒为实验原料,通过改变搅拌桨组合方式、填料高度、转速等探究粉体搅拌功率的变化规律,并对功率准数关联式进行推导并给出计算公式。在功率特性研究的基础上,选取四种螺带式搅拌桨对粉体混合性能进行研究,探讨了转速,填料高度对粉体混合性能的影响状况,并通过ANOVA分析法研究径向与轴向截面粉体的混合性能,对四种搅拌桨的混合性能进行了定量描述并对每种桨型的适用环境做了简单总结。实验结果表明搅拌功率与转速几乎呈现线性关系,即粉体体系的扭矩值与转速无关；填料高度增大,搅拌功率与扭矩值均增大,而对于同一桨型,搅拌功率随着转速的增加,其增加的幅度明显增加,探究了P／N与填料高度的关系,发现几乎呈现线性关系,但是搅拌桨不同,比例系数不同。通过对粉体混合实验,发现转速,填料高度都是粉体混合的重要参数,转速越快,达到混合要求的混合时间越短；较低的填料高度可以实现快速高效的混合,但是不同的桨型影响效果不同,剪切作用强的搅拌桨,填料高度的影响作用较弱。通过对四种搅拌桨混合速率的定量计算,发现桨型四的混合性能最好,可以适用于全槽的混合,桨型二的混合速率最大,混合性能最差,不适合大型生产设备的应用,桨型一与桨型三的混合速率相差不大,但桨型一适用于靠近壁面处的较低转速的混合,桨型三适用于靠近壁面处的较高转速的混合。本课题给出的结果可以作为指导开发合适的螺带式粉体混合设备。
[Abstract]:In this paper, the power characteristics and mixing properties of powder agitation were studied in a transparent plexiglass tank with a standard elliptical bottom of 0.476 m in diameter.In the course of the experiment, using resin particles and glass beads as raw materials, the changing law of powder stirring power was studied by changing the combination of agitator, packing height and rotating speed, and the correlation formula of power criterion was deduced and the calculation formula was given.On the basis of the study of power characteristic, four kinds of propeller were selected to study the mixing performance of powder, and the influence of rotating speed and packing height on the mixing performance of powder was discussed.The mixing performance of radial and axial cross-section powder is studied by ANOVA analysis. The mixing performance of four kinds of impellers is quantitatively described and the suitable environment for each type of impeller is simply summarized.The relationship between P / N and packing height was found to be almost linear, but the ratio coefficient was different with different impeller.Through the powder mixing experiment, it is found that the speed and the height of the filler are the important parameters of powder mixing, the faster the speed, the shorter the mixing time, and the lower the height of the filler can be, the faster and more efficient the mixing can be.However, the effects of different propeller types are different, and the effect of packing height is weak for the strong shear impeller.Through the quantitative calculation of the mixing rate of four kinds of impellers, it is found that the four propellers have the best mixing performance and can be applied to the mixing of the whole tank. The mixing rate of the propeller type 2 is the largest, and the mixing performance is the worst, which is not suitable for the application of the large production equipment.The mixing rate of propeller type 1 and propeller type 3 is not different, but propeller type one is suitable for mixing at lower rotational speed near the wall, and propeller type three is suitable for mixing at higher speed near the wall.The results of this paper can be used as a guide to develop a suitable screw belt powder mixing equipment.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ027

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