本文關(guān)鍵詞： 干-濕靜電 水膜蒸發(fā) 顆粒濃度分布 脫除效率　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來(lái),隨著國(guó)家對(duì)燃煤電廠大氣污染物排放要求越來(lái)越嚴(yán)格,煙氣超凈排放已經(jīng)成為燃煤電廠生存和可持續(xù)發(fā)展的必要選擇。靜電除塵+濕式靜電除塵(ESP+WESP)技術(shù)是實(shí)現(xiàn)煙塵超凈排放的重要技術(shù)路線,但濕式靜電除塵器(WESP)存在投資成本和運(yùn)行成本高的缺點(diǎn),因此通過優(yōu)化濕法脫硫裝置(WET-FGD)高效協(xié)同脫除顆粒物成為煙塵超凈排放的另一選擇。但是,此技術(shù)路線需要滿足前端靜電除塵器(ESP)出口煙塵濃度≤20mg/m~3,而目前電廠中靜電除塵難以滿足這一條件。針對(duì)這一問題,本文采用干-濕靜電除塵技術(shù),達(dá)到利用前端干電場(chǎng)高效脫除大顆粒、末端濕電場(chǎng)高效脫除微細(xì)顆粒物的目的。為研究干-濕靜電除塵過程中濕電場(chǎng)內(nèi)水膜蒸發(fā)對(duì)微細(xì)顆粒物分布及脫除效率的影響,本文搭建了干-濕靜電除塵模擬實(shí)驗(yàn)臺(tái)進(jìn)行詳細(xì)研究,并與干電場(chǎng)內(nèi)微細(xì)顆粒物分布及脫除效率進(jìn)行了對(duì)比,其研究過程與結(jié)果如下:首先,在干電場(chǎng)中研究了電壓和煙氣溫度對(duì)微細(xì)顆粒分布和脫除的影響規(guī)律。研究結(jié)果表明,隨電壓升高,微細(xì)脫除效率呈增大趨勢(shì),微細(xì)顆粒分級(jí)脫除效率差異化增大,粒徑約為0.381μm的顆粒受電壓升高影響較小,脫除效果不佳;隨煙氣溫度升高,微細(xì)顆粒脫除效率呈降低趨勢(shì),出現(xiàn)反混現(xiàn)象,對(duì)主流區(qū)微細(xì)顆粒脫除效率影響較小,對(duì)近壁面微細(xì)顆粒脫除效率影響較大,粒徑約為0.381μm的顆粒受煙氣溫度升高影響最大。其次,在濕電場(chǎng)中水膜自然蒸發(fā)條件下,研究了電壓和煙氣溫度對(duì)微細(xì)顆粒分布和脫除的影響規(guī)律。實(shí)驗(yàn)表明,電壓較低時(shí),水膜蒸發(fā)將同時(shí)影響主流區(qū)和近壁面區(qū)微細(xì)顆粒向壁面運(yùn)動(dòng),電壓較高時(shí),水膜蒸發(fā)僅影響近壁面附近微細(xì)顆粒的運(yùn)動(dòng)。隨煙氣溫度升高、自然蒸發(fā)強(qiáng)度增大,微細(xì)顆粒脫除效率先降低后升高,反混現(xiàn)象消失,d=0.381μm～1.6μm顆粒的脫除效率顯著提高,濕電場(chǎng)中煙氣溫度對(duì)顆粒比電阻的影響逐漸降低,水膜蒸發(fā)強(qiáng)度增大將有助于提高微細(xì)顆粒脫除效率。最后,通過提高濕電場(chǎng)中布水溫度強(qiáng)化水膜蒸發(fā),研究了強(qiáng)化蒸發(fā)后,蒸發(fā)水量增大對(duì)微細(xì)顆粒分布和脫除的影響規(guī)律。研究表明,電壓較高時(shí),強(qiáng)化蒸發(fā)后同時(shí)影響主流區(qū)和近壁面區(qū)微細(xì)顆粒運(yùn)動(dòng),蒸發(fā)強(qiáng)度增強(qiáng)對(duì)微細(xì)顆粒運(yùn)動(dòng)產(chǎn)生的阻礙作用主要體現(xiàn)于煙氣進(jìn)入濕電場(chǎng)的初始階段,之后由于強(qiáng)化蒸發(fā)使煙氣擾動(dòng)增大、促進(jìn)細(xì)顆粒物發(fā)生團(tuán)聚,使得粒徑范圍為d0.38μm細(xì)顆粒的脫除效率顯著提高。
[Abstract]:In recent years, the emission requirements of atmospheric pollutants from coal-fired power plants have become more and more stringent. Ultra-clean flue gas emission has become a necessary choice for the survival and sustainable development of coal-fired power plants. ESP WESP technology is an important technical route to realize the ultra-clean emission of smoke dust. But the wet electrostatic precipitator (WESP) has the disadvantages of high investment cost and running cost. Therefore, the efficient and cooperative removal of particulate matter by optimizing wet desulfurization device WET-FGD has become another choice for the ultra-clean emission of soot. This technical route needs to meet the needs of the front-end electrostatic precipitator (ESP) outlet dust concentration 鈮，

本文編號(hào)：1449031