本文選題：海泡石礦粉 + 文丘里噴射器　； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：研發(fā)海泡石礦粉射流分級裝置,可有效提高湖南儲量豐富、特色優(yōu)勢明顯的海泡石礦產(chǎn)品附加值和利用范圍。文丘里噴射器是海泡石礦粉射流分級裝置中礦粉與氣體混合的關(guān)鍵部件。本文基于文丘里效應(yīng),開展海泡石礦粉的文丘里噴射器優(yōu)化設(shè)計研究,主要從海泡石礦粉特性檢驗、文丘里噴射器設(shè)計、結(jié)構(gòu)參數(shù)優(yōu)化以及海泡石礦粉在文丘里噴射器內(nèi)部流動特性等方面進行了探討:(1)海泡石礦粉特性檢驗。搭建海泡石礦粉特性檢測實驗平臺,采用顯微鏡法、容積法和直剪法,對本文所用海泡石礦粉的物理特性和力學(xué)特性進行檢測,為后續(xù)仿真分析提供數(shù)據(jù)。(2)文丘里噴射器理論分析與結(jié)構(gòu)設(shè)計。首先針對文丘里噴射器工作原理、工作效率和結(jié)構(gòu)設(shè)計方法進行詳細分析;然后采用氣體動力函數(shù)法,計算得出文丘里噴射器理論噴射系數(shù);最后根據(jù)相關(guān)經(jīng)驗公式,初步確定文丘里噴射器幾何結(jié)構(gòu)。(3)文丘里噴射器結(jié)構(gòu)參數(shù)優(yōu)化。針對文丘里噴射器工作效率低的問題,通過FLUENT數(shù)值模擬,首先運用單因素控制變量法,分析不同結(jié)構(gòu)參數(shù)對文丘里噴射器工作效率的影響;然后以工作效率為考核指標,采用正交試驗方法對文丘里噴射器結(jié)構(gòu)參數(shù)優(yōu)化;最后通過極差和方差分析得出最優(yōu)結(jié)構(gòu)參數(shù),為后續(xù)仿真分析提供物理模型。(4)海泡石礦粉在文丘里噴射器內(nèi)部流動特性仿真分析。針對文丘里噴射器內(nèi)部流動情況復(fù)雜的問題,采用DPM模型,分別從壓力、速度、顆粒運動軌跡和湍流動能四個方面對不同狀態(tài)下文丘里噴射器內(nèi)部流動情況進行仿真分析。(5)海泡石礦粉在文丘里噴射器的PIV實驗分析。搭建PIV實驗平臺,對不同狀態(tài)下海泡石礦粉顆粒在文丘里噴射器內(nèi)部流動情況分析,得出內(nèi)部流動規(guī)律,并與仿真結(jié)果對比。理論分析與實驗結(jié)果表明,本文設(shè)計的文丘里噴射器不僅能實現(xiàn)海泡石礦粉與氣體快速有效混合,而且通過結(jié)構(gòu)參數(shù)優(yōu)化,提高了文丘里噴射器工作效率,對后期海泡石礦粉分級具有重要意義,可增加海泡石礦產(chǎn)品附加值和利用范圍。
[Abstract]:The research and development of sepiolite powder jet classifier can effectively improve the value added and utilization range of sepiolite mineral products with abundant reserves and obvious characteristic advantages in Hunan. Venturi ejector is a key component in the mixing of ore powder and gas in the sepiolite powder jet classifier. Based on the Venturi effect, the optimal design of Venturi ejector for sepiolite ore powder is studied in this paper, mainly from the test of the characteristics of sepiolite ore powder and the design of Venturi ejector. The structural parameters optimization and the flow characteristics of sepiolite powder in Venturi ejector were investigated. The physical and mechanical properties of sepiolite ore powder used in this paper were tested by microscope, volumetric method and direct shear method. The theoretical analysis and structure design of Venturi ejector are provided for subsequent simulation analysis. Firstly, the working principle, working efficiency and structure design method of Venturi ejector are analyzed in detail; then the theoretical ejection coefficient of Venturi ejector is calculated by using the gas dynamic function method; finally, according to the relevant empirical formula, the theoretical injection coefficient of Venturi ejector is calculated. The geometric structure of Venturi ejector was preliminarily determined and the structural parameters of Venturi ejector were optimized. Aiming at the problem of low efficiency of Venturi ejector, by using fluent numerical simulation, the influence of different structural parameters on the working efficiency of Venturi ejector is analyzed by using single factor control variable method, and then the working efficiency is taken as the evaluation index. The structural parameters of Venturi ejector are optimized by orthogonal test, and the optimum structural parameters are obtained by means of range and variance analysis. This paper provides a physical model for subsequent simulation analysis. (4) the flow characteristics of sepiolite ore powder in Venturi ejector. In view of the complex flow situation in Venturi ejector, DPM model is used to analyze the pressure and velocity of Venturi ejector. The internal flow of Venturi ejector in different states was simulated and analyzed from four aspects of particle trajectory and turbulent kinetic energy.) the PIV experiment analysis of Sepiolite ore powder in Venturi ejector was carried out. A PIV experimental platform was built to analyze the flow of sepiolite ore particles in Venturi ejector under different conditions. The internal flow pattern was obtained and compared with the simulation results. The theoretical analysis and experimental results show that the Venturi ejector designed in this paper can not only realize the rapid and effective mixing of sepiolite ore powder and gas, but also improve the efficiency of Venturi ejector by optimizing the structure parameters. It is of great significance to the classification of sepiolite ore powder in the later stage and can increase the added value and utilization range of sepiolite mineral products.
【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】：TD402

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