【摘要】：如今,我國(guó)工業(yè)化和城市化的進(jìn)程日益加快,環(huán)境污染問(wèn)題日趨嚴(yán)重�？晌胄詿煼蹓m嚴(yán)重危害全世界動(dòng)植物和人類的健康。電袋除塵器結(jié)合了電除塵器和袋除塵器的各自優(yōu)勢(shì),很好地解決了對(duì)細(xì)微粉塵的收集難題,但人們至今仍對(duì)荷電粉塵粒子向?yàn)V袋表面層的運(yùn)動(dòng)規(guī)律以及提高過(guò)濾除塵效率的機(jī)理解釋不清。本文研究的目的在于使人們初步了解荷電粉塵粒子從電區(qū)向?yàn)V袋表面運(yùn)動(dòng)的軌跡,探討收塵機(jī)理,指導(dǎo)如何保持電袋除塵器內(nèi)氣流的均布,使電袋除塵器始終保持高效運(yùn)行狀態(tài)。本文運(yùn)用電除塵和過(guò)濾除塵理論以及氣溶膠力學(xué)理論,在“前電后袋”式電袋除塵器模型中,對(duì)荷電粉塵粒子的凝并作用和其在濾袋表面的堆積規(guī)律、機(jī)理和影響電袋除塵器除塵效率的主要因素進(jìn)行了詳細(xì)分析,建立了荷電粉塵粒子向過(guò)濾層表面運(yùn)動(dòng)過(guò)程的數(shù)學(xué)模型。運(yùn)用GAMBIT軟件對(duì)電袋除塵器裝置建立了仿真模型,并以濾袋區(qū)為研究對(duì)象,借助ANSYS軟件模擬了粉塵粒子向?yàn)V袋表面運(yùn)動(dòng)情況及在濾袋表面的氣流速度分布情況,通過(guò)改變?yōu)V袋長(zhǎng)度、濾袋個(gè)數(shù)和排列方式其中任意一個(gè)條件,進(jìn)行對(duì)比實(shí)驗(yàn)。隨后通過(guò)分析濾袋表面含塵氣流速度分布情況圖,分別得出符合要求的布袋結(jié)構(gòu)大小、濾袋個(gè)數(shù)、排列方式及其對(duì)應(yīng)的入口風(fēng)速,再將其具體數(shù)值大小導(dǎo)入EXCEL表格中,利用數(shù)學(xué)手段得出均方差來(lái)判斷氣流的均勻性,優(yōu)化袋區(qū)結(jié)構(gòu),最終得出電袋除塵效果最佳的濾袋尺寸、排列方式和入口風(fēng)速。研究結(jié)果表明,荷電粉塵間的凝并效果較未荷電的更好,在濾袋表面的堆積狀態(tài)由于感應(yīng)靜電力使粉塵間產(chǎn)生排斥作用呈疏松堆積,而未荷電的粉塵則是致密堆積。不同種類的粉塵粒子在各個(gè)濾袋的捕集量的多少與塵粒本身密度大小有關(guān),密度大的粉塵在氣流速度相同的情況下由于其隨氣流高速運(yùn)動(dòng)而產(chǎn)生的慣性更大,故在后排濾袋粉塵的被捕集量更多。對(duì)于不同的濾袋排列方式,氣流在濾袋表面的速度大小也不相同,且最大氣流速度值會(huì)隨著濾袋個(gè)數(shù)的增加而減小。通過(guò)分析影響荷電粉塵粒子過(guò)濾除塵效率的主要因素,借助相關(guān)軟件模擬電袋除塵器中濾袋表面的氣流速度分布情況,再結(jié)合數(shù)學(xué)手段作具體分析,確立了電袋除塵效率最佳的袋區(qū)尺寸、濾袋個(gè)數(shù)和入口風(fēng)速為:袋區(qū)長(zhǎng)5米,袋寬2米,濾袋個(gè)數(shù)為9個(gè),入口風(fēng)速為/4.0sm,濾袋的排列方式為按“333”排列�？蔀榻窈笱芯侩姶龎m器如何保持高除塵效率以及選型和氣流均布鑒定提供理論參考。
[Abstract]:Nowadays, the process of industrialization and urbanization in China is accelerating day by day, and the environmental pollution problem is becoming more and more serious. Inhalable smoke dust seriously endangers the health of animals, plants and human beings all over the world. The ESP combines the respective advantages of ESP and PSP, and solves the problem of collecting fine dust. However, the movement of charged dust particles to the surface layer of the filter bag and the mechanism of improving the efficiency of filtration dust removal are still unclear. The purpose of this paper is to make people understand the trajectory of charged dust particles moving from the electric area to the surface of the filter bag, to discuss the mechanism of dust collection, and to guide how to keep the airflow uniformity in the bag dust collector. Make the bag dust collector always maintain efficient operation state. In this paper, the coagulation and consolidation of charged dust particles and their accumulation on the surface of the filter bag in the model of "front and rear bag" electric bag dust precipitator are studied by using the theory of electric dust collection, filtration and dust removal and aerosol mechanics theory. The mechanism and the main factors affecting the dust removal efficiency of the ESP were analyzed in detail and the mathematical model of the movement of charged dust particles to the surface of the filter layer was established. The simulation model of the ESP device is established by using GAMBIT software, and the flow velocity distribution on the filter bag surface is simulated by using ANSYS software to simulate the movement of dust particles to the filter bag surface. By changing the length, number and arrangement of filter bags, a comparative experiment was carried out. Then, by analyzing the distribution of dust-containing airflow velocity on the filter bag surface, the structure size, the number of filter bags, the arrangement mode and the corresponding inlet wind speed are obtained respectively, and then the specific values are introduced into the EXCEL table. The mean square deviation was obtained to judge the uniformity of airflow, optimize the structure of bag area, and finally obtained the best filter bag size, arrangement mode and inlet wind speed. The results show that the condensing effect of charged dust is better than that of uncharged dust, and the stacking state on the surface of filter bag is loosely stacked due to inductive electrostatic force, while the uncharged dust is dense. The amount of dust particles in each filter bag is related to the density of the dust particles. When the velocity of the air flow is the same, the dust has more inertia due to the high velocity of the air flow. Therefore, in the back of the filter bag dust arrested more. The velocity of airflow on the surface of filter bag is different for different arrangement of filter bags, and the maximum velocity value will decrease with the increase of the number of filter bags. By analyzing the main factors that affect the dust removal efficiency of charged dust particle filter, the distribution of airflow velocity on the filter bag surface in the electrostatic bag dust collector is simulated by relevant software, and the concrete analysis is made with mathematical means. The optimum bag area size of the electric bag dust removal efficiency was established. The number of the filter bags and the inlet wind speed were as follows: the bag area length was 5 meters, the bag width was 2 meters, the filter bag number was 9, the inlet wind speed was 4.0 sm. the arrangement of the filter bags was arranged according to "333". It can provide a theoretical reference for the future study on how to keep high dust removal efficiency, type selection and identification of airflow distribution.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X701.2

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本文編號(hào)：2180317