【摘要】：近年來PM2.5污染嚴(yán)重,大氣霧霾現(xiàn)象頻繁出現(xiàn),燃煤鍋爐產(chǎn)生的細(xì)顆粒物是造成其污染的主要原因之一。燃煤鍋爐產(chǎn)生的煙氣在經(jīng)過脫硫裝置之后,又會產(chǎn)生新的顆粒物,加上前端未脫除的超細(xì)顆粒物,實(shí)際的顆粒物排放可能超標(biāo)或達(dá)不到超凈排放要求。濕式電除塵器作為一個(gè)終端控制設(shè)備,能夠有效地解決該問題。但目前廣泛采用的濕式電除塵器,存在水量消耗大、廢水處理困難、布水不均等問題。針對這些問題,本文采用煙氣增濕自沖刷柔性電極濕式電除塵方式,對顆粒物的脫除過程進(jìn)行了研究。本文設(shè)計(jì)并搭建了煙氣增濕自沖刷柔性電極濕式電除塵器實(shí)驗(yàn)臺,對實(shí)驗(yàn)臺進(jìn)行了系統(tǒng)的調(diào)試,并研究了除塵器集塵極材料及系統(tǒng)運(yùn)行參數(shù)對PM10、PM2.5及總塵顆粒的脫除性能。在借鑒前人研究的基礎(chǔ)上,所搭建實(shí)驗(yàn)臺在濕式電除塵器入口煙道前增加一文丘里管段,并在其喉管部位使用雙流體噴嘴霧化增濕,水霧在高速氣流的作用下進(jìn)一步霧化并均勻分散。在霧化液滴增速過程中,小液滴與氣流中的粉塵顆粒發(fā)生碰撞而被捕獲,在擴(kuò)散管段以粉塵顆粒為凝結(jié)核的速度逐漸加快,最終形成直徑較大的含塵液滴,有利于后續(xù)濕式電除塵器的捕集。二次電壓、風(fēng)速、給粉量、集塵極、噴霧量對總塵脫除效率都有一定的影響。其中,隨著給粉量和入口風(fēng)速的增加,除塵效率呈下降趨勢;隨二次電壓的增加和噴霧量的增加,除塵效率呈上升趨勢;集塵極840A(丙綸)的性能要略優(yōu)于3927(滌綸);隨后通過不同情況下除塵效率公式的分析,發(fā)現(xiàn)除塵效率都與多伊奇數(shù)有關(guān)。最后,本文對不同工況下PM10、PM2.5以及分級去除效率進(jìn)行了測試。實(shí)驗(yàn)發(fā)現(xiàn)在0.2μm~0.5μm以及2μm處,除塵效率有極小值;風(fēng)速的增加使PM10、PM2.5的粒數(shù)去除效率增加而使其質(zhì)量去除效率下降;隨給粉量的增加,PM10、PM2.5以及分級除塵效率都呈現(xiàn)先增加后減小的趨勢;隨噴霧量以及二次電壓的增加,PM10、PM2.5以及分級除塵效率都呈現(xiàn)逐漸上升的趨勢。
[Abstract]:In recent years, PM2.5 pollution is serious, atmospheric haze phenomenon occurs frequently, the fine particles produced by coal-fired boiler is one of the main causes of its pollution. After the flue gas produced by coal-fired boiler goes through the desulphurization device, it will produce new particulate matter, plus the superfine particle which is not removed from the front end, the actual particulate matter emission may exceed the standard or meet the requirement of super-net emission. As a terminal control device, wet electrostatic precipitator can solve this problem effectively. However, the wet electrostatic precipitator, which is widely used at present, has the problems of large water consumption, difficult wastewater treatment and uneven distribution of water. In order to solve these problems, the removal process of particulate matter was studied in this paper by means of wet electrodedusting method with self-scouring flexible electrode for flue gas humidification. In this paper, a wet electrostatic precipitator with self-scouring flexible electrode is designed and built. The system is debugged, and the removal performance of dust collector electrode material and system operating parameters on PM10 / PM2.5 and total dust particles is studied. On the basis of previous studies, a Venturi section was added in front of the inlet flue of wet electrostatic precipitator, and the atomization and humidification of two-fluid nozzle were used in the throat. The water mist is further atomized and evenly dispersed under the action of high velocity airflow. In the process of atomizing droplet growth, the small droplets collide with the dust particles in the airflow and are captured. The speed of using the dust particles as the condensation nucleus in the diffusion pipe section is gradually accelerated, and finally the dust-containing droplets with larger diameters are formed. It is propitious to catch the wet electrostatic precipitator. The secondary voltage, wind speed, powder feed, dust collector and spray amount have certain influence on the total dust removal efficiency. The dust removal efficiency decreases with the increase of powder feed and inlet wind speed, and increases with the increase of secondary voltage and spray quantity. The performance of the dust collector 840A (polypropylene fiber) is slightly better than that of 3927 (polyester), and through the analysis of the formula of dust removal efficiency under different conditions, it is found that the dust removal efficiency is all related to the Deutsch number. Finally, the removal efficiency of PM10 / PM2.5 and its classification were tested under different operating conditions. The experimental results show that the dust removal efficiency is minimal at 0.2 渭 m 0.5 渭 m and 2 渭 m, the particle number removal efficiency of PM10 / PM2.5 decreases with the increase of wind speed, and the dust removal efficiency increases first and then decreases with the increase of powder feed. With the increase of the spray amount and the secondary voltage, the PM10 / PM2.5 and the dust removal efficiency increased gradually.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X701.2

【引證文獻(xiàn)】

相關(guān)會議論文 前3條

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3 龔立賢;張哲軍;;火電廠采用電除塵器、袋式除塵器的情況及發(fā)展趨勢[A];北京機(jī)械工程學(xué)會2012年優(yōu)秀論文評選論文集[C];2012年

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本文編號：2160544