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靜電除塵器的(de)(de)工作(zuo)原理是利用高(gao)壓電(dian)(dian)場使煙氣(qi)發(fa)生電(dian)(dian)離,氣(qi)流中(zhong)的(de)(de)粉塵荷電(dian)(dian)在(zai)電(dian)(dian)場作(zuo)用下與氣(qi)流分離。負極(ji)由不同(tong)斷(duan)面形狀的(de)(de)金屬(shu)導線制成,叫放電(dian)(dian)電(dian)(dian)極(ji)。
正極由不同幾何形狀的金屬板制成,叫集塵電極。靜電除塵器廠家的(de)性(xing)(xing)(xing)能(neng)受粉塵(chen)(chen)性(xing)(xing)(xing)質、設備構造和煙氣(qi)流(liu)速(su)等三(san)個因素(su)的(de)影(ying)(ying)響(xiang)。粉塵(chen)(chen)的(de)比(bi)電(dian)(dian)阻(zu)是(shi)評價(jia)導電(dian)(dian)性(xing)(xing)(xing)的(de)指標,它對(dui)除塵(chen)(chen)效(xiao)率有(you)直接的(de)影(ying)(ying)響(xiang)。比(bi)電(dian)(dian)阻(zu)過低,塵(chen)(chen)粒難以保持在集(ji)塵(chen)(chen)電(dian)(dian)極上,致使其重返氣(qi)流(liu)。比(bi)電(dian)(dian)阻(zu)過高(gao),到達集(ji)塵(chen)(chen)電(dian)(dian)極的(de)塵(chen)(chen)粒電(dian)(dian)荷不易放(fang)出,在塵(chen)(chen)層之間(jian)形(xing)成電(dian)(dian)壓梯度(du)會產生局部(bu)擊穿和放(fang)電(dian)(dian)現象。這些(xie)情況(kuang)都會造成除塵(chen)(chen)效(xiao)率下降。
簡介
靜電除塵器的電源由控制箱、升壓變壓器和整流器組成。電源輸出的電壓高低對除塵效率也有很大影響。因此,靜電除塵器運行電壓需(xu)保(bao)持40一(yi)75kV乃至100kV以上(shang)。
工作原理
電(dian)(dian)(dian)除塵器的(de)基本原(yuan)理是利用(yong)電(dian)(dian)(dian)力捕集(ji)煙(yan)氣(qi)中的(de)粉塵,主(zhu)要包(bao)括(kuo)以下四個相(xiang)互(hu)有關(guan)的(de)物(wu)理過程:(1)氣(qi)體的(de)電(dian)(dian)(dian)離。(2)粉塵的(de)荷(he)電(dian)(dian)(dian)。(3)荷(he)電(dian)(dian)(dian)粉塵向電(dian)(dian)(dian)極(ji)移動。(4)荷(he)電(dian)(dian)(dian)粉塵的(de)捕集(ji)。
荷電(dian)(dian)粉塵的(de)(de)捕集過(guo)(guo)(guo)程:在(zai)(zai)兩個曲率半徑相差(cha)較大的(de)(de)金屬(shu)陽極(ji)(ji)和陰極(ji)(ji)上,通過(guo)(guo)(guo)高壓直流電(dian)(dian),維持一個足以使(shi)(shi)氣體電(dian)(dian)離(li)的(de)(de)電(dian)(dian)場,氣體電(dian)(dian)離(li)后所產生的(de)(de)電(dian)(dian)子(zi)(zi):陰離(li)子(zi)(zi)和陽離(li)子(zi)(zi),吸附在(zai)(zai)通過(guo)(guo)(guo)電(dian)(dian)場的(de)(de)粉塵上,使(shi)(shi)粉塵獲得(de)電(dian)(dian)荷。荷電(dian)(dian)極(ji)(ji)性不同(tong)的(de)(de)粉塵在(zai)(zai)電(dian)(dian)場力的(de)(de)作用下(xia),分(fen)別向(xiang)不同(tong)極(ji)(ji)性的(de)(de)電(dian)(dian)極(ji)(ji)運動,沉(chen)積在(zai)(zai)電(dian)(dian)極(ji)(ji)上,而達到粉塵和氣體分(fen)離(li)的(de)(de)目(mu)的(de)(de)。
基本結構
靜(jing)電(dian)(dian)電(dian)(dian)除(chu)(chu)塵器(qi)(qi)由兩大部分(fen)組成:一部分(fen)是(shi)電(dian)(dian)除(chu)(chu)塵器(qi)(qi)本體系統(tong)(tong);另一部分(fen)是(shi)提(ti)供高壓(ya)直(zhi)流電(dian)(dian)的供電(dian)(dian)裝置和低(di)壓(ya)自(zi)動控(kong)制系統(tong)(tong)。電(dian)(dian)除(chu)(chu)塵器(qi)(qi)的結構原理圖(tu)如(ru)圖(tu)1所示,高壓(ya)供電(dian)(dian)系統(tong)(tong)為升壓(ya)變壓(ya)器(qi)(qi)供電(dian)(dian),除(chu)(chu)塵器(qi)(qi)集(ji)塵極接地。低(di)壓(ya)電(dian)(dian)控(kong)制系統(tong)(tong)用(yong)來(lai)控(kong)制電(dian)(dian)磁振打錘、卸灰電(dian)(dian)極、輸灰電(dian)(dian)極以及幾個部件的溫(wen)度(du)。