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  本文選題：低壓脈沖袋式除塵器　切入點：清灰結(jié)構(gòu)　出處：《安徽工業(yè)大學(xué)》2013年碩士論文

【摘要】：脈沖噴吹袋式除塵器作為一種重要的除塵設(shè)備，因其具有過濾效率高、處理氣量大、清灰效果好等優(yōu)點，目前在冶金、電力、化工、環(huán)保等領(lǐng)域得到了廣泛的應(yīng)用。袋式除塵器的運行實踐表明，適宜的濾料、袋室內(nèi)流場的均勻性以及優(yōu)良的清灰系統(tǒng)是確保袋式除塵器成功運行的三項關(guān)鍵因素。優(yōu)良的清灰系統(tǒng)取決于清灰系統(tǒng)設(shè)計的科學(xué)性，而清灰系統(tǒng)設(shè)計的科學(xué)性則要求對清灰結(jié)構(gòu)進(jìn)行深入的優(yōu)化設(shè)計。 本文首先對脈沖清灰機理進(jìn)行歸納總結(jié)，確定以壓力峰值作為衡量清灰性能好壞的評價指標(biāo)；搭建脈沖清灰實驗臺，并對文丘里管結(jié)構(gòu)對袋式除塵器清灰性能的影響進(jìn)行了測試。然后在模型實驗研究的基礎(chǔ)上，建立起單條濾袋的清灰數(shù)值計算模型，并對數(shù)值計算模型進(jìn)行了驗證；同時利用數(shù)值計算方法研究了工業(yè)袋式除塵器在不同操作參數(shù)和不同清灰結(jié)構(gòu)時的清灰流場。最后，本文基于響應(yīng)曲面法并使用統(tǒng)計軟件Minitab V15研究了噴嘴直徑、噴吹高度、文丘里管喉管直徑、文丘里管及布袋長度對袋式除塵器清灰性能的影響，并得出了這5個影響因子的二次多項式預(yù)測模型，，結(jié)果表明： （1）在本文模型實驗研究范圍內(nèi)，沒有文丘里管時袋式除塵器清灰性能較好，并且文丘里管喉徑對脈沖清灰性能影響較小，而文丘里管長度對脈沖清灰性能的影響較明顯；對工業(yè)中兩種不同文丘里管結(jié)構(gòu)清灰流場的數(shù)值模擬發(fā)現(xiàn)，文丘里管結(jié)構(gòu)對清灰性能具有重要的影響，選擇合適的文丘里管可以優(yōu)化清灰系統(tǒng)。 （2）通過數(shù)值計算結(jié)果與文獻(xiàn)實驗結(jié)果和模型實驗結(jié)果的對比，數(shù)值計算結(jié)果和文獻(xiàn)實驗測試結(jié)果吻合較好，誤差在10％左右，說明本文采用的數(shù)值計算模型可以用于計算袋式除塵器清灰結(jié)構(gòu)的清灰性能。 （3）袋式除塵器的清灰性能隨著噴吹壓力的增加而得到提高，但是噴吹壓力并不是越大越好，過大的噴吹壓力會造成耗能的增加，從而導(dǎo)致設(shè)備運行費用的增加；在一定的時間范圍內(nèi)，延長噴吹時間可以改善清灰性能，當(dāng)噴吹時間超過一定值后再延長噴吹時間，只是增加了壓縮空氣消耗量，并不能提高濾袋側(cè)壁的壓力峰值。 （4）工業(yè)脈沖袋式除塵器的清灰性能隨著噴嘴直徑的增加而提高，并且在濾袋中下部其壓力峰值基本上已趨于穩(wěn)定；噴吹系統(tǒng)存在著理想的噴吹高度，噴吹高度過低會導(dǎo)致濾袋側(cè)壁的壓力峰值分布不均勻，噴吹高度過高會削弱濾袋下部的清灰強度；隨著濾袋長度的增加，濾袋中下部壓力峰值迅速降低，濾袋過長會導(dǎo)致其中下部清灰不利。 （5）基于響應(yīng)曲面法并通過方差分析和回歸方程系數(shù)顯著性檢驗可知，噴嘴直徑（d/D）、文丘里管喉管直徑（de/D）和布袋長度（L/D）是影響清灰性能的顯著性因素；其中清灰性能隨著噴嘴直徑和文丘里管喉管直徑的增大而提高，隨著布袋長度的增大先提高后降低。在本文所研究的尺寸范圍內(nèi)，當(dāng)d/D=0.125，即d=20mm、de/D=0.375，即de=60mm、L/D=21，即L=3360mm時，清灰效果分別達(dá)到最優(yōu)。
[Abstract]:As an important dust - removing equipment , the pulse - blowing bag - type dust collector is widely used in the fields of metallurgy , electric power , chemical industry and environmental protection . The operation practice of bag - type dust collector shows that the proper filter material , the uniformity of the flow field in the bag chamber and the excellent ash cleaning system are the three key factors to ensure the successful operation of the bag - type dust collector . The excellent ash - cleaning system depends on the scientific nature of the design of the ash cleaning system , and the scientific nature of the design of the ash cleaning system requires an in - depth optimization design for the ash cleaning structure .

Firstly , the principle of pulse ash cleaning is summarized , and the pressure peak value is used as the evaluation index to measure the performance of ash cleaning .
The effect of the structure of Venturi tube on the ash removal performance of bag - type dust collector is tested . Based on the experimental study of the model , a numerical model for calculating the ash content of single filter bag is established , and the numerical calculation model is verified .
The effects of nozzle diameter , blowing height , venturi throat diameter , venturi tube and bag length on the ash removal performance of bag - type dust collector are studied by using numerical calculation method . Finally , the quadratic polynomial prediction model of these five influencing factors is obtained . The results show that :

( 1 ) In the range of the experimental research of this paper , the dust - removing property of bag - type dust collector is better when there is no Venturi tube , and the throat diameter of the Venturi tube has little influence on the pulse cleaning performance , and the influence of the length of the venturi tube on the pulse ash cleaning performance is obvious ;
The numerical simulation of ash flow field in two different Venturi tube structures in industry shows that the Venturi tube structure has important influence on the ash removal performance , and the suitable Venturi tube can be selected to optimize the ash cleaning system .

( 2 ) By comparing the numerical results with the experimental results of the literature and the experimental results of the model , the numerical results agree well with the experimental results of the literature , and the error is about 10 % . The numerical calculation model used in this paper can be used to calculate the ash - cleaning performance of the dust - removing structure of the bag - type dust collector .

( 3 ) The ash - removing performance of bag - type dust collector is improved with the increase of blowing pressure , but the higher the blowing pressure is , the better the blowing pressure is , the excessive blowing pressure can increase the energy consumption , which can lead to the increase of equipment operation cost ;
In a certain time range , prolonging the blowing time can improve the ash cleaning performance , and when the blowing time exceeds a certain value , the blowing time is prolonged , only the consumption of compressed air is increased , and the pressure peak value of the side wall of the filter bag cannot be improved .

( 4 ) the ash removal performance of the industrial pulse bag filter increases with the increase of the diameter of the nozzle , and the pressure peak in the lower part of the filter bag is basically stabilized ;
An ideal blowing height is found in the blowing system , which leads to uneven distribution of pressure peaks in the side wall of the filter bag , which can weaken the ash removal strength at the lower part of the filter bag .
As the length of the filter bag increases , the peak value of the lower pressure in the filter bag is rapidly decreased , and the filter bag is too long to cause the lower part to clear ash .

( 5 ) Based on the response surface method and the difference analysis and the regression equation coefficient significance test , it can be seen that the nozzle diameter ( d / D ) , the diameter of the venturi throat ( de / D ) and the length of the bag ( L / D ) are significant factors that affect the ash cleaning performance ;
In this paper , when d / D = 0.125 , that is , d = 20 mm , de / D = 0 . 375 , that is , de = 60mm , L / D = 21 , that is , L = 3360mm , the ash cleaning effect is optimal .

【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU834.64

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 姬忠禮,彭書,陳鴻海,時銘顯;陶瓷過濾器脈沖反吹全過程的瞬變流場計算[J];化工學(xué)報;2003年01期

2 王素華,姬忠禮,王樹立;陶瓷過濾器脈沖反吹系統(tǒng)內(nèi)流場的數(shù)值模擬[J];石油大學(xué)學(xué)報(自然科學(xué)版);2002年04期

本文編號：1671011