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  本文關鍵詞：電袋除塵器結構優(yōu)化的數(shù)值模擬研究　出處：《江西理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 電袋除塵器 捕集粒徑 開孔范圍 濾袋分布 數(shù)值模擬

【摘要】：當今,粉塵對人體的危害和造成的自然環(huán)境污染越來越嚴重,且粉塵危害在事故總數(shù)中所占比例均較高,因此,人們對PM2.5的要求也越來越嚴格,研發(fā)高性能的除塵器有著重要意義。本文依據(jù)電袋除塵器結構優(yōu)化的實際情況,通過經(jīng)典流體力學軟件FLUENT6.0以流體力學為基礎建立守恒方程組,分別采用uds電場編程與k-ε模型對電袋除塵器電場的建立與湍流現(xiàn)象進行描述,進行了電袋除塵器靜電區(qū)內(nèi)氣流分布、荷電顆粒運動軌跡、極板開孔導致的壓降變化及袋式區(qū)濾袋的分布的數(shù)值模擬研究。在數(shù)值模擬可信的基礎上,研究了不同因素(電場分布、極板開孔、濾袋分布等)對電袋除塵器結構優(yōu)化的影響,得出最小去除粒徑、集塵板幾何因素、濾袋最佳分布方式,并結合流場參數(shù)變化情況對壓力變化機理進行了分析。得出以下結論:(1)氣流方向的電場強度小于集塵板方向的電場強度,以放電線中心為最強。(2)當放電線荷上45k V時,靜電區(qū)產(chǎn)生穩(wěn)態(tài)電場,電場會影響流場的分布。(3)靜電區(qū)最小捕集粒徑為1.5μm,得出對于電袋復合除塵器,在確定電壓下,可確定靜電區(qū)內(nèi)的最小捕集粒徑,隨著粒徑的增大受到電場力的作用越大粒子越容易被捕集;(4)集塵板適合開孔的范圍為0.324m至1.25m,在研究得出除塵器最小去除粒徑的條件下,可確定集塵板的開孔范圍。(5)通過分析該除塵器集塵板最佳開孔率為0.535,除塵器集塵板不會隨著開孔率增大除塵性能就越好,集塵板存在最佳開孔率;(6)通過分析該除塵器集塵板最佳孔徑大小為0.095,且隨著集塵板粗糙度增大,極板的磨損也增大;得出集塵板最佳開孔率及孔徑大小和集塵板磨損情況,有利于除塵器結構設計及優(yōu)化的研究,結構設計與實際相符合。為了提高集塵板使用壽命,在集塵板粗糙度的選擇需要慎重考慮。(7)濾袋的合理分布會影響濾袋的除塵效率。本文通過對電袋除塵器中的電場、流場、荷電顆粒、集塵板幾何因素、濾袋分布等因素進行了模擬研究,為電袋除塵器結構優(yōu)化提供一種參考方法。
[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.
【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X701.2

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本文編號：1347198