海泡石矿粉文丘里喷射器设计与流动特性分析

发布时间：2018-06-21 00:20

本文选题：海泡石矿粉 + 文丘里喷射器　；参考：《湘潭大学》2017年硕士论文

【摘要】：研发海泡石矿粉射流分级装置,可有效提高湖南储量丰富、特色优势明显的海泡石矿产品附加值和利用范围。文丘里喷射器是海泡石矿粉射流分级装置中矿粉与气体混合的关键部件。本文基于文丘里效应,开展海泡石矿粉的文丘里喷射器优化设计研究,主要从海泡石矿粉特性检验、文丘里喷射器设计、结构参数优化以及海泡石矿粉在文丘里喷射器内部流动特性等方面进行了探讨:(1)海泡石矿粉特性检验。搭建海泡石矿粉特性检测实验平台,采用显微镜法、容积法和直剪法,对本文所用海泡石矿粉的物理特性和力学特性进行检测,为后续仿真分析提供数据。(2)文丘里喷射器理论分析与结构设计。首先针对文丘里喷射器工作原理、工作效率和结构设计方法进行详细分析;然后采用气体动力函数法,计算得出文丘里喷射器理论喷射系数;最后根据相关经验公式,初步确定文丘里喷射器几何结构。(3)文丘里喷射器结构参数优化。针对文丘里喷射器工作效率低的问题,通过FLUENT数值模拟,首先运用单因素控制变量法,分析不同结构参数对文丘里喷射器工作效率的影响;然后以工作效率为考核指标,采用正交试验方法对文丘里喷射器结构参数优化;最后通过极差和方差分析得出最优结构参数,为后续仿真分析提供物理模型。(4)海泡石矿粉在文丘里喷射器内部流动特性仿真分析。针对文丘里喷射器内部流动情况复杂的问题,采用DPM模型,分别从压力、速度、颗粒运动轨迹和湍流动能四个方面对不同状态下文丘里喷射器内部流动情况进行仿真分析。(5)海泡石矿粉在文丘里喷射器的PIV实验分析。搭建PIV实验平台,对不同状态下海泡石矿粉颗粒在文丘里喷射器内部流动情况分析,得出内部流动规律,并与仿真结果对比。理论分析与实验结果表明,本文设计的文丘里喷射器不仅能实现海泡石矿粉与气体快速有效混合,而且通过结构参数优化,提高了文丘里喷射器工作效率,对后期海泡石矿粉分级具有重要意义,可增加海泡石矿产品附加值和利用范围。
[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.
【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】：TD402

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