电袋除尘器结构优化的数值模拟研究

发布时间：2017-12-28 20:02

本文关键词：电袋除尘器结构优化的数值模拟研究　出处：《江西理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：当今,粉尘对人体的危害和造成的自然环境污染越来越严重,且粉尘危害在事故总数中所占比例均较高,因此,人们对PM2.5的要求也越来越严格,研发高性能的除尘器有着重要意义。本文依据电袋除尘器结构优化的实际情况,通过经典流体力学软件FLUENT6.0以流体力学为基础建立守恒方程组,分别采用uds电场编程与k-ε模型对电袋除尘器电场的建立与湍流现象进行描述,进行了电袋除尘器静电区内气流分布、荷电颗粒运动轨迹、极板开孔导致的压降变化及袋式区滤袋的分布的数值模拟研究。在数值模拟可信的基础上,研究了不同因素(电场分布、极板开孔、滤袋分布等)对电袋除尘器结构优化的影响,得出最小去除粒径、集尘板几何因素、滤袋最佳分布方式,并结合流场参数变化情况对压力变化机理进行了分析。得出以下结论:(1)气流方向的电场强度小于集尘板方向的电场强度,以放电线中心为最强。(2)当放电线荷上45k V时,静电区产生稳态电场,电场会影响流场的分布。(3)静电区最小捕集粒径为1.5μm,得出对于电袋复合除尘器,在确定电压下,可确定静电区内的最小捕集粒径,随着粒径的增大受到电场力的作用越大粒子越容易被捕集;(4)集尘板适合开孔的范围为0.324m至1.25m,在研究得出除尘器最小去除粒径的条件下,可确定集尘板的开孔范围。(5)通过分析该除尘器集尘板最佳开孔率为0.535,除尘器集尘板不会随着开孔率增大除尘性能就越好,集尘板存在最佳开孔率;(6)通过分析该除尘器集尘板最佳孔径大小为0.095,且随着集尘板粗糙度增大,极板的磨损也增大;得出集尘板最佳开孔率及孔径大小和集尘板磨损情况,有利于除尘器结构设计及优化的研究,结构设计与实际相符合。为了提高集尘板使用寿命,在集尘板粗糙度的选择需要慎重考虑。(7)滤袋的合理分布会影响滤袋的除尘效率。本文通过对电袋除尘器中的电场、流场、荷电颗粒、集尘板几何因素、滤袋分布等因素进行了模拟研究,为电袋除尘器结构优化提供一种参考方法。
[Abstract]:Nowadays, the harm of dust to the human body and the pollution caused by natural environment are more and more serious. The proportion of dust hazards in the total number of accidents is relatively high. Therefore, people's requirements for PM2.5 are also more and more strict. The development of high-performance dust remover is of great significance. In this paper, based on the actual situation of electric bag filter structure optimization, through the classical fluid mechanics software FLUENT6.0 on hydrodynamics conservation equations were established, respectively using UDS and k- programming model of the electric field electric bag filter field establishment and turbulence are described, the numerical simulation of the distribution of pressure drop and electric bag bag electrostatic precipitator zone air distribution and charged particle trajectories and the plate hole in the type area. In the numerical simulation on the basis of trust, different factors (electric field distribution, plate hole, bag distribution) of electric bag filter structure optimization, the minimum particle size, the removal of dust collecting plate geometry factor, the best distribution mode and combined with the bag, the changes of flow parameters on pressure change mechanism analysis. The following conclusions are drawn: (1) the intensity of the electric field in the direction of the air flow is less than the intensity of the electric field in the direction of the dust collector, and the center of the discharge line is the strongest. (2) when the power line is charged with 45k V, the static electric field produces a steady electric field, and the electric field will affect the distribution of the flow field. (3) the minimum electrostatic trapping particle size of 1.5 m, obtained for electric bag composite dust remover, in determining the electrostatic voltage, can be determined within the area of minimum trap size, with the increase of particle size by electric field force larger particles more easily captured; (4) the range of dust the hole plate suitable for 0.324m to 1.25m, the study concluded that dust removal under the conditions of minimum size, can determine the dust collecting plate hole range. (5) through the dust collecting plate is the best opening rate is 0.535 of the dust collector, dust collecting plate with no opening rate increasing the dust collecting plate performance is better, there is the best opening rate; (6) through the analysis of the dust collecting plate is the optimum pore size is 0.095 of the dust remover, and with dust surface roughness increases, the wear plate also increases; the dust collecting plate the best porosity and the pore size and the dust collecting plate wear, facilitates the study for structure design and optimization of dust, which is consistent with the actual structure design. In order to improve the service life of the dust collector, the selection of the roughness of the dust collection board should be carefully considered. (7) the reasonable distribution of filter bag will affect the efficiency of filter bag. In this paper, the electric field, the flow field, the charged particles, the geometric factors of the dust collecting board and the distribution of the filter bags were simulated, and a reference method for the structure optimization of the electric bag filter was provided.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.2

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