旋風水膜除塵器
旋風水膜
旋風水膜應用廣泛，如圖所示。噴霧沿切線噴向塔壁，使壁面形成一層很薄的不斷下流的水膜。含塵氣體由塔體下部導入，旋轉上升，塵顆粒在離心力作用下甩向壁面后為水膜所粘附，沿壁面流下排走。
旋風水膜的氣體人口速度范圍為15～45m/s，入口速度高，除塵效率高，但通過除塵器的阻力增加，一般壓降為0.5～1.5kPa，耗水量為0.5～1.5L/m3。旋風除塵器適用處理煙氣量大和含塵濃度高的場合，常作為除塵脫硫的第一級除塵裝置，由于煙氣溫度高，洗滌過程中進行絕熱增濕使煙氣溫度下降，有利于濕式脫硫及脫硫中耐腐蝕材質的選用。
當含塵煙氣進入洗滌塔后由導向葉片使氣流高速旋轉，并與噴頭噴霧的堿性脫硫液體接觸，如側噴離心脫硫除塵器。由于脫硫為二個理論級。所以采用二級旋流器；為使氣液分離，采用擴大分離段直徑，降低煙氣流速；堿性液體側噴，使塔壁面潤濕，有利于除塵。
電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)除塵(chen)器(qi)的(de)(de)(de)(de)可(ke)(ke)(ke)(ke)控(kong)(kong)(kong)(kong)(kong)硅(gui)(gui)調(diao)壓(ya)(ya)(ya)(ya)高(gao)壓(ya)(ya)(ya)(ya)硅(gui)(gui)整(zheng)流(liu)自(zi)(zi)動控(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi) 可(ke)(ke)(ke)(ke)控(kong)(kong)(kong)(kong)(kong)硅(gui)(gui)自(zi)(zi)動控(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)高(gao)壓(ya)(ya)(ya)(ya)硅(gui)(gui)整(zheng)流(liu)裝(zhuang)置是電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)除塵(chen)器(qi)普遍(bian)配(pei)套使用的(de)(de)(de)(de)一種高(gao)壓(ya)(ya)(ya)(ya)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)裝(zhuang)置，這(zhe)(zhe)種控(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)裝(zhuang)置以(yi)(yi)檢(jian)測電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)二次(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)為(wei)反饋信(xin)號。自(zi)(zi)動控(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)系統接(jie)受到(dao)各(ge)種反饋信(xin)號之后(hou)(hou)(hou)(hou)立(li)即(ji)(ji)進行分析判斷，并迅速(su)發(fa)出控(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)指(zhi)令改變(bian)主(zhu)回路(lu)調(diao)壓(ya)(ya)(ya)(ya)可(ke)(ke)(ke)(ke)控(kong)(kong)(kong)(kong)(kong)硅(gui)(gui)的(de)(de)(de)(de)導通角，使電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)得到(dao)調(diao)節(jie)(jie)，而(er)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)自(zi)(zi)控(kong)(kong)(kong)(kong)(kong)凋(diao)節(jie)(jie)主(zhu)要星以(yi)(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)所能施加的(de)(de)(de)(de)最(zui)高(gao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(即(ji)(ji)閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)擊(ji)穿電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya))為(wei)控(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)依據。隨著電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)煙氣(qi)條件的(de)(de)(de)(de)變(bian)化，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)擊(ji)穿電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)降低(di)時(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)產生閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)。此時(shi)(shi)自(zi)(zi)控(kong)(kong)(kong)(kong)(kong)系統接(jie)受到(dao)這(zhe)(zhe)一反饋信(xin)號后(hou)(hou)(hou)(hou)，隨之發(fa)出控(kong)(kong)(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)指(zhi)令立(li)即(ji)(ji)使主(zhu)回路(lu)調(diao)壓(ya)(ya)(ya)(ya)可(ke)(ke)(ke)(ke)控(kong)(kong)(kong)(kong)(kong)硅(gui)(gui)封鎖(suo)(suo)，而(er)使整(zheng)流(liu)器(qi)無高(gao)壓(ya)(ya)(ya)(ya)輸(shu)出，以(yi)(yi)保(bao)證電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)介質絕(jue)緣強度有(you)足夠的(de)(de)(de)(de)時(shi)(shi)間(jian)恢復到(dao)閃(shan)(shan)(shan)鉻(ge)擊(ji)穿前的(de)(de)(de)(de)正常(chang)值(zhi)(zhi)(zhi)。為(wei)防止閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)封鎖(suo)(suo)主(zhu)回路(lu)側壓(ya)(ya)(ya)(ya)可(ke)(ke)(ke)(ke)控(kong)(kong)(kong)(kong)(kong)硅(gui)(gui)后(hou)(hou)(hou)(hou)而(er)再次(ci)(ci)(ci)重新導通，整(zheng)流(liu)器(qi)高(gao)壓(ya)(ya)(ya)(ya)輸(shu)出使電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)發(fa)生第二次(ci)(ci)(ci)連續閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)，必(bi)須(xu)使閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)封鎖(suo)(suo)后(hou)(hou)(hou)(hou)的(de)(de)(de)(de)高(gao)壓(ya)(ya)(ya)(ya)輸(shu)出值(zhi)(zhi)(zhi)比閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)發(fa)生時(shi)(shi)的(de)(de)(de)(de)高(gao)壓(ya)(ya)(ya)(ya)值(zhi)(zhi)(zhi)降低(di)一個適當的(de)(de)(de)(de)幅度；并且(qie)其(qi)數(shu)值(zhi)(zhi)(zhi)的(de)(de)(de)(de)大小可(ke)(ke)(ke)(ke)根據電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)煙氣(qi)條件及其(qi)變(bian)化趨勢，在一定的(de)(de)(de)(de)范(fan)圍內進行整(zheng)定調(diao)節(jie)(jie)。顯然，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)值(zhi)(zhi)(zhi)每(mei)當閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)封鎖(suo)(suo)一次(ci)(ci)(ci)后(hou)(hou)(hou)(hou)，將(jiang)從降低(di)以(yi)(yi)后(hou)(hou)(hou)(hou)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)值(zhi)(zhi)(zhi)開(kai)始逐(zhu)漸向另一次(ci)(ci)(ci)閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)值(zhi)(zhi)(zhi)接(jie)近，而(er)且(qie)上升的(de)(de)(de)(de)速(su)度也是可(ke)(ke)(ke)(ke)以(yi)(yi)調(diao)節(jie)(jie)的(de)(de)(de)(de)。通常(chang)把電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)上升速(su)率(lv)(lv)的(de)(de)(de)(de)調(diao)節(jie)(jie)稱(cheng)作(zuo)(zuo)+du/dt調(diao)壓(ya)(ya)(ya)(ya)，而(er)把閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)封鎖(suo)(suo)后(hou)(hou)(hou)(hou)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)下降副值(zhi)(zhi)(zhi)調(diao)節(jie)(jie)稱(cheng)作(zuo)(zuo)-du/dt調(diao)節(jie)(jie)。通過調(diao)±du/dt，可(ke)(ke)(ke)(ke)以(yi)(yi)改變(bian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)每(mei)兩次(ci)(ci)(ci)閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)的(de)(de)(de)(de)間(jian)隔(ge)時(shi)(shi)間(jian)，即(ji)(ji)閃(shan)(shan)(shan)絡(luo)(luo)(luo)(luo)頻率(lv)(lv)。通常(chang)把除塵(chen)效率(lv)(lv)最(zui)高(gao)時(shi)(shi)的(de)(de)(de)(de)“火花(hua)率(lv)(lv)”稱(cheng)作(zuo)(zuo)“最(zui)佳火花(hua)率(lv)(lv)”。
