海泡石超细粉射流分级原理样机结构设计及实验研究

发布时间：2018-07-14 11:50

【摘要】：海泡石是一种纤维状含水硅酸盐矿物,是目前世界上用途最广的非金属矿物材料之一。随着超细颗粒生产技术和纳米技术的发展,海泡石超细粉研究开发与应用迈入了新阶段。本文结合国内外现有的超细粉分级技术和理论研究成果,研发了一种海泡石超细粉射流分级原理样机,针对原理样机的基础理论、机械结构设计、关键零部件结构优化和海泡石粉末分级实验等方面进行了研究。(1)海泡石超细粉射流分级理论基础分析。通过对射流基础理论和康达效应理论进行分析,分别得到海泡石超细粉射流分级原理样机的主气流部件和分级室部件结构设计思路。(2)海泡石超细粉射流分级原理样机结构设计。根据射流分级理论得到主气流部件、分级室部件和辅助气流部件的结构设计,从而研发出海泡石超细粉射流分级原理样机整机结构。(3)原理样机中关键零部件结构优化。基于ANSYS-CFX有限元分析软件,对主气流喷嘴、康达块和分级室机箱的结构分别做了相关仿真分析。依据主气流喷嘴的结构优化思路,利用正交试验方法对扁嘴扇形喷嘴内部流场进行仿真分析,得到主气流喷嘴结构优化尺寸;依据康达块结构优化思路,对不同曲率康达块表面上流场运动进行仿真分析,得到康达块结构优化尺寸;依据紊流中海泡石颗粒随气流的跟随性研究,对分级室内颗粒运动进行仿真分析,得到分级室机箱结构优化尺寸。(4)海泡石超细粉射流分级原理样机粉末分级实验研究。针对海泡石超细粉射流分级原理样机开展了两类实验:其一是验证不同曲率康达块的康达效应的仿真结论;其二是通过对影响分级效率的多种因素做正交试验,得到原理样机的最佳控制参数,并利用VHX-2000C超景深显微镜观察分级后细粉中颗粒粒径,发现细粉中大部分颗粒粒径处于10?m以下。在理论分析基础上,本文成功研制出一种海泡石超细粉射流分级原理样机,原理样机分级实验表明:原理样机能分级出颗粒粒径在10?m以下的超细粉,从而实现海泡石超细粉分级。
[Abstract]:Sepiolite is one of the most widely used non-metallic mineral materials in the world. With the development of ultrafine particle production technology and nanotechnology, the research, development and application of sepiolite ultrafine powder have entered a new stage. In this paper, a prototype of sepiolite ultrafine powder jet classification principle is developed, which is based on the basic theory and mechanical structure design of the principle prototype, combined with the existing domestic and foreign ultrafine powder classification technology and theoretical research results. The structure optimization of key parts and the experiment of sepiolite powder classification were studied. (1) the theoretical analysis of sepiolite ultrafine powder jet classification. Based on the analysis of the basic theory of jet and the theory of Kangda effect, the structure design ideas of the main airflow components and the classifying chamber components of the prototype of the sepiolite ultrafine powder jet classification principle are obtained respectively. (2) the structure design of the sepiolite ultrafine powder jet classification principle prototype. According to the theory of jet classification, the structural design of main airflow components, classifying chamber components and auxiliary airflow components is obtained, and the structure of the prototype of sepiolite ultrafine powder jet classification principle is developed. (3) the structure optimization of key parts in the principle prototype. Based on the finite element analysis software ANSYS-CFX, the structure of the main airflow nozzle, the Kangda block and the classifier box are simulated and analyzed respectively. According to the structure optimization idea of the main airflow nozzle, the internal flow field of the flat-nozzled fan nozzle is simulated and analyzed by orthogonal test method, and the optimum size of the main airflow nozzle structure is obtained. The flow field motion on the surface of Kangda block with different curvature was simulated and analyzed, and the optimum size of the structure was obtained, and the particle movement in the classifying chamber was simulated and analyzed according to the study of the sepiolite particle following the airflow in the turbulent flow. The optimum size of the crate structure of the classifying chamber was obtained. (4) the experimental study on the powder classification of the prototype of sepiolite ultrafine powder jet classification principle. Two kinds of experiments have been carried out on the prototype of sepiolite ultrafine powder jet classification principle: one is to verify the Kanda effect of different curvature and the other is to make orthogonal experiments on many factors that affect the classification efficiency. The optimal control parameters of the prototype were obtained, and the particle size of the fine powder was observed by VHX-2000C superfine depth microscope. It was found that most of the particles in the fine powder were below 10 m. On the basis of theoretical analysis, a prototype of sepiolite ultrafine powder jet classification principle has been successfully developed. The experimental results show that the principle prototype can classify ultrafine powder with particle size below 10m. Thus, sepiolite ultrafine powder classification is realized.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD454

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