旋风除尘器提高微细粉尘除尘效率的研究

发布时间：2018-01-10 18:14

本文关键词：旋风除尘器提高微细粉尘除尘效率的研究　出处：《武汉科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：旋风除尘器作为一种常用的除尘设备，提高其对粉尘分离效率问题一直是国内外研究的热点。对于8～10μm以上的颗粒，，现代的旋风除尘器能够基本除尽。而对于5μm以上的颗粒粉尘，旋风除尘器也拥有较好的除尘效率，能够在工业上得到普遍应用。但是针对5μm以下的微细粉尘，由于其较低分离效率，还不能广泛应用于工业上。本论文针对微细粉尘除尘效率不高的问题及旋风除尘器尺寸优化主要做了以下工作：（1）通过在旋风除尘器顶端安装喷头,将旋风除尘和喷雾降尘相结合。高速旋流提高了雾滴碰撞并捕集微尘粒子的概率，而雾滴则增加了微尘粒子的离心力，致使微尘粒子更容易被甩向器壁。利用CFX仿真计算出除尘器的可喷雾空间，发现可喷雾区间只与旋风除尘器的筒体直径有关，与入口气速及粉尘粒径无关。并并通过数学方法计算出喷雾过程中压力与捕捉效率的数学关系进而求解压力对喷雾型旋风除尘器性能的影响。同时考虑喷雾液滴因旋转气流的热传导而造成的蒸发现象，计算出了喷雾液滴粒径与含尘气体温度的关系。 (2）针对小筒径的旋风除尘器，排气管的直径及插入深度均会对其除尘效率造成比较明显的影响。本文通过利用ANSYS CFX流体仿真软件的多相流模块对排气管的直径，插入深度及筒体直径进行仿真，并分析其影响旋风除尘器除尘效率的原因。结果表明筒体直径为30mm，排气管插入深度为60mm时旋风除尘器的除尘效率较好。（3）以ANSYS软件为工具，利用复合形法对排气管插入深度及筒体直径进行联合仿真优化，求解了旋风除尘器除尘效率关于以上两个参数的局部最优解，为以后多参数的仿真优化提供参考。
[Abstract]:As a kind of commonly used dust removal equipment, cyclone dust collector has been a hot spot in domestic and international research for improving its dust separation efficiency. The modern cyclone dust collector can be basically eliminated, and for the particle dust above 5 渭 m, the cyclone dust collector also has a better dust removal efficiency. It can be widely used in industry, but for fine dust below 5 渭 m, it can not be widely used in industry because of its low separation efficiency. In this paper, aiming at the problem that the dust removal efficiency of fine dust is not high and the size optimization of cyclone dust collector, the main work is as follows: By installing a sprinkler at the top of the cyclone dust collector, the cyclone dedusting is combined with the spray dust fall. The high speed swirl increases the probability of droplets colliding and catching dust particles. The droplet increases the centrifugal force of the dust particles, which makes the dust particles easier to be thrown to the wall of the device. The spray space of the dust collector can be calculated by CFX simulation. It is found that the spray zone is only related to the diameter of the cylinder of the cyclone precipitator. It is independent of inlet gas velocity and dust particle size. The mathematical relationship between pressure and capture efficiency in spray process is calculated by mathematical method, and the influence of pressure on the performance of spray type cyclone dust collector is solved. Evaporation caused by the heat conduction of a rotating airstream. The relationship between the droplet size and the temperature of the dust-containing gas was calculated. Cyclone dust collector for small diameter. The diameter and insertion depth of exhaust pipe will have a significant effect on the dust removal efficiency. In this paper, the diameter of exhaust pipe is affected by the multiphase flow module of ANSYS CFX fluid simulation software. The insertion depth and the diameter of the cylinder are simulated, and the reasons that affect the dust removal efficiency of the cyclone dust collector are analyzed. The results show that the diameter of the cylinder is 30 mm. The dust removal efficiency of cyclone dust collector is better when the depth of exhaust pipe insertion is 60 mm. Using the ANSYS software as the tool, the exhaust pipe insertion depth and the tube diameter are simulated and optimized by using the complex method. The local optimal solution of the dust removal efficiency of cyclone precipitator with respect to the above two parameters is solved, which provides a reference for the simulation and optimization of multiple parameters in the future.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.2

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