控制(zhi)FGD主煙道和旁路煙道密封(feng)或開啟的風門被稱作擋板門，在電除塵器后，FGD煙(yan)(yan)(yan)道系(xi)統設置的(de)擋板(ban)(ban)(ban)門(men)通(tong)常(chang)包括進日擋板(ban)(ban)(ban)（原(yuan)煙(yan)(yan)(yan)氣擋板(ban)(ban)(ban)），旁路(lu)擋板(ban)(ban)(ban)和(he)出(chu)日擋板(ban)(ban)(ban)（凈煙(yan)(yan)(yan)氣擋板(ban)(ban)(ban)人FGD系(xi)統運(yun)(yun)行時，旁路(lu)擋板(ban)(ban)(ban)門(men)關(guan)(guan)閉(bi)，FGD進出(chu)口擋板(ban)(ban)(ban)門(men)打開(kai)，當FGD裝置發生故障或必須停機(ji)維護(hu)時，鍋爐(lu)(lu)煙(yan)(yan)(yan)氣經由煙(yan)(yan)(yan)道旁路(lu)至煙(yan)(yan)(yan)囪排(pai)放(fang)。為了(le)確保鍋爐(lu)(lu)的(de)安全運(yun)(yun)行，煙(yan)(yan)(yan)道旁路(lu)擋板(ban)(ban)(ban)門(men)一(yi)般(ban)設計(ji)為快開(kai)擋板(ban)(ban)(ban)門(men)，快開(kai)時間通(tong)常(chang)要(yao)(yao)求不超(chao)過(guo)15S.為提高安全可靠性，有時還在脫硫(liu)風(feng)機(ji)的(de)入口煙(yan)(yan)(yan)道處安裝壓(ya)力開(kai)關(guan)(guan)，一(yi)旦壓(ya)力超(chao)高同樣要(yao)(yao)快速打開(kai)旁路(lu)擋板(ban)(ban)(ban)門(men)，作為保護(hu)鍋爐(lu)(lu)安全的(de)第二道防線。
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