本文選題：濾筒除塵器　切入點：流場均勻性　出處：《西安建筑科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：面對日益嚴重的大氣污染問題,高效除塵器的深入研究刻不容緩。濾筒除塵器是在袋式除塵器基礎(chǔ)上發(fā)展起來的新型除塵器,具有體積小、過濾面積大、維護施工便捷以及除塵效率高等眾多優(yōu)點。然而,現(xiàn)在國內(nèi)外學者對濾筒除塵器研究較少,對濾筒除塵器內(nèi)部流場特性方面的研究更是欠缺。維持濾筒除塵器內(nèi)部流場良好的均勻性,可保障除塵器的使用壽命和過濾效率,具有重大的工程意義。本文系統(tǒng)介紹了濾筒除塵器濾筒結(jié)構(gòu)、材料以及清灰方式等,通過實驗測試對濾筒除塵器基本運行參數(shù)進行記錄和研究。由實驗測試得:覆膜濾筒運行時初始內(nèi)外壓差為39.8Pa,初始過濾效率在98%左右,脈沖噴吹清灰后,濾筒內(nèi)外壓差以及過濾效率都較之前有所提高;并且在測試過程中發(fā)現(xiàn)濾筒除塵器存在內(nèi)部流場紊亂問題。針對實驗用濾筒除塵器流場紊亂問題,本文借助于計算流體力學(CFD)相關(guān)軟件以及實驗中所得除塵器進出口速度、濾筒內(nèi)外壓差等參數(shù),建立實驗用濾筒除塵器模型。模擬分析得除塵器流場速度相對均方差值為0.43,說明流場均勻性差。為了研究導流板、氣流均布板和灰斗擋風板對除塵器流場均勻性的影響,設(shè)立5因素4水平的正交試驗,通過建立16種不同的濾筒除塵器模型模擬分析。研究發(fā)現(xiàn):適當增加氣流均布板數(shù)量C、減小其角度D以及增加灰斗擋風板長度E可有效提高流場均勻性,并且設(shè)立灰斗擋風板能防止灰斗內(nèi)二次揚塵發(fā)生;調(diào)整N型風道中的導流板數(shù)量A及其角度B對流場影響甚微;影響流場均勻性各因素重要性排序為灰斗擋風板E氣流均布板角度D氣流均布板數(shù)量C導流板數(shù)量A導流板角度B。利用較優(yōu)水平建立的新型濾筒除塵器,其流場均勻性提高了39.5%。除了上述幾個因素外,進風方式也是影響濾筒除塵器內(nèi)部流場均勻性的另一主要因素,為了更好地反映濾筒除塵器在下進風、側(cè)進風及上進風三種進風方式下的內(nèi)部流動情況,在之前研究基礎(chǔ)上,本文從速度跡線、速度云圖以及壓力云圖等因素多方位剖析除塵器內(nèi)部流場,同時借助濾筒內(nèi)外側(cè)6條壓力監(jiān)測線分析濾筒附近流場。研究表明:三種進風方式中,側(cè)進風濾筒除塵器流場均勻性最優(yōu)、上進風濾筒除塵器次之、下進風濾筒除塵器最差,側(cè)進風濾筒除塵器濾筒流量最大偏差(35)qiK為0.192,綜合流量不均勻幅值?(35)K為0.069;側(cè)進風濾筒除塵器與上進風濾筒除塵器內(nèi)部流場具有一定的相似性,但都面臨兩濾筒間隙速度過高,濾筒沖刷嚴重問題。通過布置開孔率為30%均布板優(yōu)化上進風濾筒除塵器,流場均勻性顯著提高,最大流量不均勻幅值(35)qiK減小46.2%、綜合流量不均勻幅值?(35)K減小了42.3%。
[Abstract]:In the face of the increasingly serious problem of air pollution, the in-depth study of high efficiency dust collector is urgent. The filter drum dust collector is a new type of dust collector developed on the basis of bag dust collector, which has small volume and large filter area. The maintenance construction is convenient and the dust removal efficiency is high. However, there are few researches on the filter drum dust collector at home and abroad. The research on the flow field characteristics of the filter drum dust collector is even less. To maintain the good uniformity of the flow field in the filter tube dust collector, the service life and filtration efficiency of the filter can be guaranteed. It is of great engineering significance. This paper systematically introduces the structure, materials and ash removal methods of filter drum dust collector. The basic operating parameters of filter tube dust collector were recorded and studied by experimental test. The experimental results showed that the initial pressure difference between inside and outside was 39.8 Pa. the initial filtration efficiency was about 98%. The pressure difference inside and outside the filter barrel and the filtration efficiency are improved, and the problem of internal flow field disorder in the filter tube dust collector is found in the testing process. In this paper, the inlet and outlet velocity of the dust collector and the pressure difference inside and outside the filter tube are obtained by means of the CFDs software and the experiment. The model of filter tube dust collector for experiment is established. The simulation results show that the relative mean square deviation of the velocity of the dust collector is 0.43, which indicates that the flow field is not uniform. In order to study the influence of the airflow distribution plate and the ash bucket windshield on the uniformity of the flow field of the dust collector, the flow field uniformity of the dust collector is studied. Set up 5 factors and 4 levels of orthogonal experiments, Based on the simulation analysis of 16 different filter drum dust catcher models, it is found that the flow field uniformity can be effectively improved by increasing the number of airflow uniform plates C, reducing the angle D and increasing the length E of the dust bucket windshield plate. The secondary dust in the hopper can be prevented by setting up the grey bucket windshield, and the influence of adjusting the number of diversion plates A and its angle B on the flow field in N type air duct is very little. The order of importance of the factors affecting the uniformity of the flow field is as follows: grey bucket windshield, E air distribution angle, D flow distribution plate number, C flow guide plate number, A flow guide plate angle B, A new filter drum dust collector, which is established by using the better level. In addition to the above several factors, the air intake mode is also another main factor affecting the uniformity of the flow field in the filter drum dust collector, in order to better reflect the lower inlet air of the filter tube dust collector, On the basis of previous studies, this paper analyzes the internal flow field of the precipitator from factors such as velocity trace, velocity cloud map and pressure cloud map. At the same time, the flow field near the filter tube is analyzed with the help of six pressure monitoring lines on the inside and outside side of the filter tube. The results show that the flow field uniformity of the sideway inlet filter is the best, the upper air filter is the second, and the lower inlet filter is the worst. The maximum deviation of the flow rate of the filter cartridge is 0.192.The amplitude of the comprehensive flow is not uniform? K = 0.069. The internal flow field of the cross inlet filter drum dust collector is similar to that of the upper air filter drum filter, but both of them are faced with excessive clearance velocity between the two cartridges. The filter tube scour is serious problem. By arranging the perforation rate of 30% uniform distribution plate to optimize the upper air filter drum dust collector, the flow field uniformity is improved significantly, the maximum flow rate uneven amplitude is 35% and the maximum flow rate uneven amplitude is reduced to 46.2%, and the comprehensive flow rate is not uniform. 35% K decreased 42.3%.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X701.2

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本文編號：1597137