【摘要】：海泡石是一種纖維狀含水硅酸鹽礦物,是目前世界上用途最廣的非金屬礦物材料之一。隨著超細顆粒生產(chǎn)技術(shù)和納米技術(shù)的發(fā)展,海泡石超細粉研究開發(fā)與應(yīng)用邁入了新階段。本文結(jié)合國內(nèi)外現(xiàn)有的超細粉分級技術(shù)和理論研究成果,研發(fā)了一種海泡石超細粉射流分級原理樣機,針對原理樣機的基礎(chǔ)理論、機械結(jié)構(gòu)設(shè)計、關(guān)鍵零部件結(jié)構(gòu)優(yōu)化和海泡石粉末分級實驗等方面進行了研究。(1)海泡石超細粉射流分級理論基礎(chǔ)分析。通過對射流基礎(chǔ)理論和康達效應(yīng)理論進行分析,分別得到海泡石超細粉射流分級原理樣機的主氣流部件和分級室部件結(jié)構(gòu)設(shè)計思路。(2)海泡石超細粉射流分級原理樣機結(jié)構(gòu)設(shè)計。根據(jù)射流分級理論得到主氣流部件、分級室部件和輔助氣流部件的結(jié)構(gòu)設(shè)計,從而研發(fā)出海泡石超細粉射流分級原理樣機整機結(jié)構(gòu)。(3)原理樣機中關(guān)鍵零部件結(jié)構(gòu)優(yōu)化�；贏NSYS-CFX有限元分析軟件,對主氣流噴嘴、康達塊和分級室機箱的結(jié)構(gòu)分別做了相關(guān)仿真分析。依據(jù)主氣流噴嘴的結(jié)構(gòu)優(yōu)化思路,利用正交試驗方法對扁嘴扇形噴嘴內(nèi)部流場進行仿真分析,得到主氣流噴嘴結(jié)構(gòu)優(yōu)化尺寸;依據(jù)康達塊結(jié)構(gòu)優(yōu)化思路,對不同曲率康達塊表面上流場運動進行仿真分析,得到康達塊結(jié)構(gòu)優(yōu)化尺寸;依據(jù)紊流中海泡石顆粒隨氣流的跟隨性研究,對分級室內(nèi)顆粒運動進行仿真分析,得到分級室機箱結(jié)構(gòu)優(yōu)化尺寸。(4)海泡石超細粉射流分級原理樣機粉末分級實驗研究。針對海泡石超細粉射流分級原理樣機開展了兩類實驗:其一是驗證不同曲率康達塊的康達效應(yīng)的仿真結(jié)論;其二是通過對影響分級效率的多種因素做正交試驗,得到原理樣機的最佳控制參數(shù),并利用VHX-2000C超景深顯微鏡觀察分級后細粉中顆粒粒徑,發(fā)現(xiàn)細粉中大部分顆粒粒徑處于10?m以下。在理論分析基礎(chǔ)上,本文成功研制出一種海泡石超細粉射流分級原理樣機,原理樣機分級實驗表明:原理樣機能分級出顆粒粒徑在10?m以下的超細粉,從而實現(xiàn)海泡石超細粉分級。
[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.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD454

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