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袋式除塵器采用直流負電的原因是什么？

來源：zkksm.cn      發布日期： 2023年12月11日
降低煙溫，避免漏風，調節冷熱氣流分布。A、檢測空氣預熱器和省煤器，提高其熱交換速度，將煙氣溫度降低在150℃以下。B、避免爐膛、空氣預熱器、煙道、除塵器漏風，減少除塵器煙氣中的氧含量(低于8%)。C、內蒙古工業除塵器保溫良好，避免結露引起酸腐蝕。D．調整冷熱氣流分布。
  1、降低煙(yan)溫(wen)，避(bi)免漏(lou)風，調節冷熱氣(qi)流(liu)分布。A、檢測空(kong)氣(qi)預(yu)熱器(qi)和省煤器(qi)，提高其熱交換速度(du)(du)，將煙(yan)氣(qi)溫(wen)度(du)(du)降低在150℃以下(xia)。B、避(bi)免爐膛、空(kong)氣(qi)預(yu)熱器(qi)、煙(yan)道(dao)、除(chu)塵(chen)器(qi)漏(lou)風，減少除(chu)塵(chen)器(qi)煙(yan)氣(qi)中(zhong)的氧含量(低于8%)。C、內蒙古工業除塵器(qi)保溫良好(hao)，避免結(jie)露引起酸腐蝕。D．調(diao)整冷熱氣流分布。

  2、控制噴射(she)(she)壓(ya)力，增加噴射(she)(she)間隔。新(xin)生產設備阻力低，可適當降低噴射(she)(she)壓(ya)力、脈沖寬度，延長噴射(she)(she)間隔，有(you)利于(yu)提高(gao)除(chu)(chu)灰袋的使用壽命(ming)。在LA上下運行時(shi)，除(chu)(chu)灰袋的阻力將逐漸(jian)保持穩定，噴射(she)(she)壓(ya)力可根據需要適當增加，縮(suo)短噴射(she)(she)間隔。

  3、啟動(dong)前，對除塵(chen)(chen)袋進行預(yu)噴漆(qi)。檢(jian)查儲灰罐(guan)需(xu)要一(yi)定量(liang)的灰塵(chen)(chen)，啟動(dong)引風機(ji)，對除塵(chen)(chen)袋進行預(yu)噴漆(qi)，直到2-3mm厚的粉塵(chen)(chen)層(約3h)堆積在布袋表面，鍋爐才能投油(you)打火。為了保護(hu)除灰袋，每次鍋爐點火前都要對除灰袋進行預(yu)噴漆(qi)，并檢(jian)查預(yu)噴漆(qi)效果。將(jiang)油(you)槍霧化燃(ran)燒，避免大量(liang)未(wei)燃(ran)燒的油(you)滴帶(dai)到爐內，導(dao)致糊袋。


內蒙古工業除塵器


  4、正常運(yun)行(xing)時，除灰(hui)布袋(dai)的差壓大于(yu)1500PA(電＋袋(dai)1200PA)開始噴射，直到800、900PA停止清灰(hui)。典型壓差新袋(dai)為(wei)1.0KPA，接近(jin)壽命時為(wei)2.5KPA!

  5、鍋爐(lu)(lu)正常運行時(shi)，爐(lu)(lu)內(nei)氧量(liang)應保持在2％13%，袋式除塵器含氧量(liang)小于8%％。

  6、當排煙溫(wen)度(du)達到150℃時，可采取減負、減送風、引(yin)風等措(cuo)施(shi)。當煙溫(wen)達到160℃時，可進行二次(ci)報(bao)警，繼續(xu)(xu)降低(di)負荷，達到降低(di)煙溫(wen)的(de)目的(de)，達到170℃報(bao)警，同時開始保護灑水(shui)。監測煙氣溫(wen)度(du)的(de)下降趨勢，停止(zhi)灑水(shui)至160℃以(yi)下，繼續(xu)(xu)監測，直(zhi)至排煙溫(wen)度(du)恢復正常(chang)。超過180℃時應緊急停止(zhi)。

  從電(dian)(dian)離的(de)(de)角度來看(kan)，DC和交(jiao)(jiao)流之間沒有本質的(de)(de)區(qu)別。然(ran)而，工(gong)頻(pin)交(jiao)(jiao)流電(dian)(dian)的(de)(de)頻(pin)率為60Hz，即交(jiao)(jiao)流電(dian)(dian)作(zuo)為電(dian)(dian)源，兩個電(dian)(dian)之間的(de)(de)性(xing)能每秒變(bian)化60次。隨著電(dian)(dian)場強(qiang)度方向的(de)(de)不斷變(bian)化，粉塵在改變(bian)電(dian)(dian)場力的(de)(de)作(zuo)用下也不穩定。灰塵被氣(qi)流從電(dian)(dian)場帶(dai)走(zou)，然(ran)后到達除(chu)塵器(qi)。因此，交(jiao)(jiao)流袋式(shi)除(chu)塵器(qi)的(de)(de)除(chu)塵速度非常低。

  DC電源的(de)性能(neng)是穩定(ding)的(de)，一旦灰塵(chen)被充電，它就會運行到相反的(de)電力中。因此，工業上(shang)使用的(de)袋式除塵(chen)器都使用DC電源。

  袋式除塵器(qi)電暈(yun)選擇負性的原(yuan)因是與正電暈(yun)相比具有以(yi)下優點。

  1、穩定的放電性能。

  2、火(huo)花(hua)放電電壓較好：

  放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)越(yue)(yue)高(gao)(gao)(gao)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)除(chu)塵器的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)場強度和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)暈電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)密(mi)度越(yue)(yue)高(gao)(gao)(gao)，除(chu)塵速度越(yue)(yue)高(gao)(gao)(gao)。實驗表明，在相(xiang)同條件下(xia)，負電(dian)(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)一般高(gao)(gao)(gao)于(yu)正電(dian)(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)，火(huo)花塞電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)也較(jiao)大(da)。火(huo)花放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)是指高(gao)(gao)(gao)壓(ya)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)場使空氣瞬(shun)時電(dian)(dian)(dian)(dian)(dian)(dian)(dian)離，產生(sheng)大(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，釋放(fang)(fang)大(da)量熱量，使空氣發出(chu)聲音和亮度，產生(sheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)火(huo)花。

  3、大電(dian)暈電(dian)流：

  由(you)于上述原因，絕大多數工業袋(dai)式(shi)除塵器(qi)都(dou)使用負電。只有在空氣凈(jing)化的情況下(xia)，臭氧一般是積(ji)累的。

  除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)率(lv)(lv)(lv)的(de)(de)優(you)缺點(dian)是(shi)測量裝置的(de)(de)基本參數值。除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)度(du)表(biao)明，袋(dai)式(shi)(shi)(shi)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)器(qi)對(dui)含(han)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)氣(qi)體的(de)(de)處理與袋(dai)式(shi)(shi)(shi)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)率(lv)(lv)(lv)有很大關系。多管除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)器(qi)的(de)(de)陰影(ying)阻力、除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)層(ceng)厚度(du)、過濾材料、除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)層(ceng)厚度(du)、過濾風速(su)的(de)(de)選(xuan)擇(ze)以及多管除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)器(qi)的(de)(de)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)方法都影(ying)響著除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)袋(dai)的(de)(de)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)率(lv)(lv)(lv)。過濾風速(su)的(de)(de)選(xuan)擇(ze)和除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)方法等(deng)因(yin)素。其次，介紹了影(ying)響袋(dai)式(shi)(shi)(shi)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)器(qi)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)率(lv)(lv)(lv)的(de)(de)三個(ge)因(yin)素。不(bu)同工況下(xia)材料袋(dai)的(de)(de)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)度(du)不(bu)同。聲脈(mo)沖袋(dai)式(shi)(shi)(shi)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)器(qi)的(de)(de)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)度(du)受粉塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)特性、阻力、粉塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)層(ceng)厚度(du)、原除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)袋(dai)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)度(du)、積塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)后除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)袋(dai)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)度(du)和除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)后除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)袋(dai)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)率(lv)(lv)(lv)的(de)(de)影(ying)響。可見(jian)，砂袋(dai)表(biao)面(mian)的(de)(de)粉塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)層(ceng)通常(chang)稱為(wei)二次過濾層(ceng)，而砂袋(dai)只起(qi)到支(zhi)撐風沙層(ceng)的(de)(de)作用。因(yin)此(ci)，除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)強度(du)應(ying)適當(dang)。應(ying)保留厚度(du)粉塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)層(ceng)，避免使用脈(mo)沖袋(dai)式(shi)(shi)(shi)除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)器(qi)，降低除(chu)(chu)(chu)(chu)(chu)(chu)(chu)(chu)塵(chen)(chen)(chen)(chen)(chen)(chen)(chen)(chen)速(su)度(du)。

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