氣(qi)密封(feng)(feng)擋(dang)板門擋(dang)板密封(feng)(feng)風(feng)系(xi)統包(bao)括密封(feng)(feng)風(feng)機(ji)及其(qi)密封(feng)(feng)風(feng)站。密封(feng)(feng)氣(qi)壓(ya)力(li)至少(shao)維持比煙(yan)氣(qi)較高壓(ya)力(li)高5mbar，因(yin)此(ci)風(feng)機(ji)設計(ji)有足夠的容(rong)量(liang)和壓(ya)頭。密封(feng)(feng)風(feng)機(ji)可集中布(bu)置，也(ye)可分散布(bu)置。集中布(bu)置為密封(feng)(feng)系(xi)統一(yi)般每爐設兩(liang)臺，按(an)2×99%容(rong)量(liang)設計(ji)，一(yi)運一(yi)備。分散設計(ji)采用各擋(dang)板自帶密封(feng)(feng)風(feng)機(ji)主要應(ying)用于(yu)發(fa)電廠風(feng)道(dao).煙(yan)道(dao)中做截(jie)流或調(diao)節(jie)介質(zhi)流量(liang)用.也(ye)可用于(yu)其(qi)它行業(ye)中的風(feng)道(dao).煙(yan)道(dao).圓(yuan)風(feng)門可使(shi)系(xi)統某一(yi)管(guan)路介質(zhi)全部(bu)流通/截(jie)斷或介質(zhi)流量(liang)隨(sui)控制而變(bian)化.對(dui)于(yu)直徑(jing)較小的圓(yuan)風(feng)門.它具有截(jie)流及調(diao)節(jie)介質(zhi)流量(liang)兩(liang)個功能(neng).對(dui)于(yu)直徑(jing)很大的圓(yuan)風(feng)門.其(qi)線性(xing)可調(diao)性(xing)不太明顯.

氣(qi)(qi)密(mi)封(feng)(feng)(feng)擋(dang)(dang)板(ban)門(men)(men)在(zai)大型火力(li)發電(dian)機(ji)組(zu)煙(yan)氣(qi)(qi)脫(tuo)(tuo)硫（FGD）系統(tong)中，煙(yan)氣(qi)(qi)脫(tuo)(tuo)硫擋(dang)(dang)板(ban)門(men)(men)是脫(tuo)(tuo)硫裝置進入和退出運行的重要設備。每套FGD脫(tuo)(tuo)硫擋(dang)(dang)板(ban)系統(tong)由進、出口擋(dang)(dang)板(ban)門(men)(men)和旁(pang)路(lu)擋(dang)(dang)板(ban)門(men)(men)，公(gong)用一套密(mi)封(feng)(feng)(feng)空(kong)氣(qi)(qi)系統(tong)（包括電(dian)加(jia)熱器）組(zu)成(cheng)。 擋(dang)(dang)板(ban)門(men)(men)采取帶密(mi)封(feng)(feng)(feng)空(kong)氣(qi)(qi)的單軸雙(shuang)擋(dang)(dang)板(ban)結構型式(shi)。每個擋(dang)(dang)板(ban)葉片(pian)四周設有(you)(you)鎳合(he)金密(mi)封(feng)(feng)(feng)片(pian)，擋(dang)(dang)板(ban)門(men)(men)本體上密(mi)封(feng)(feng)(feng)風入口設有(you)(you)密(mi)封(feng)(feng)(feng)風閥(fa)，和擋(dang)(dang)板(ban)門(men)(men)之間為機(ji)械聯動。煙(yan)氣(qi)(qi)擋(dang)(dang)板(ban)開，密(mi)封(feng)(feng)(feng)風閥(fa)關(guan)；煙(yan)氣(qi)(qi)擋(dang)(dang)板(ban)關(guan)，密(mi)封(feng)(feng)(feng)風閥(fa)開。擋(dang)(dang)板(ban)門(men)(men)關(guan)閉時，在(zai)雙(shuang)層葉片(pian)間注入密(mi)封(feng)(feng)(feng)空(kong)氣(qi)(qi)，山東(dong)氣(qi)(qi)密(mi)封(feng)(feng)(feng)擋(dang)(dang)板(ban)門(men)(men)，以達(da)到有(you)(you)效隔絕(jue)前后介質的目的。

氣(qi)(qi)密封(feng)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)這種(zhong)分類方式主要取決于煙(yan)(yan)(yan)(yan)氣(qi)(qi)溫度，因為(wei)碳(tan)鋼(gang)煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)，2米*2.8米碳(tan)鋼(gang)氣(qi)(qi)密封(feng)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)，煙(yan)(yan)(yan)(yan)氣(qi)(qi)溫度不宜超過(guo)300度，所以(yi)300度以(yi)上的，需要選用不銹(xiu)鋼(gang)煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)了。第三，煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)，還可以(yi)根據(ju)使(shi)用的具體位(wei)置，分為(wei)入口煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)，出口煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)和旁路煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)。第四(si)，煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)，還可以(yi)根據(ju)葉(xie)片的形(xing)狀，焊(han)接方式，分為(wei)插板(ban)(ban)式煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)和百葉(xie)窗(chuang)式煙(yan)(yan)(yan)(yan)氣(qi)(qi)擋(dang)(dang)(dang)板(ban)(ban)門(men)(men)。

氣(qi)密(mi)(mi)封擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)主要用(yong)(yong)于火(huo)電(dian)廠的(de)煙(yan)氣(qi)脫硫系統中(zhong)(zhong)，用(yong)(yong)來(lai)隔(ge)絕煙(yan)氣(qi)流通，也可(ke)用(yong)(yong)于其(qi)它運行(xing)(xing)(xing)隔(ge)離要求比較高(gao)的(de)煙(yan)風(feng)管道(dao)(dao)中(zhong)(zhong)。氣(qi)密(mi)(mi)封擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)擋(dang)(dang)(dang)板(ban)(ban)(ban)的(de)啟閉靠電(dian)動(dong)（或氣(qi)動(dong)）執(zhi)行(xing)(xing)(xing)器(qi)通過連桿機構(gou)來(lai)執(zhi)行(xing)(xing)(xing)，74DD煙(yan)道(dao)(dao)氣(qi)密(mi)(mi)封擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)，氣(qi)密(mi)(mi)封擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)連桿機構(gou)可(ke)為球(qiu)關節)設有開關定(ding)位(wei)連鎖(suo)裝置及外接行(xing)(xing)(xing)程開關，保證(zheng)動(dong)作(zuo)的(de)可(ke)靠和有效預防誤(wu)操作(zuo)。圓(yuan)形(xing)擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)又稱圓(yuan)形(xing)關斷門(men)(men)、圓(yuan)形(xing)調節門(men)(men)該擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)主要應用(yong)(yong)于發電(dian)廠風(feng)道(dao)(dao)、煙(yan)道(dao)(dao)中(zhong)(zhong)做截流或調節介質流量用(yong)(yong)，也可(ke)用(yong)(yong)于其(qi)它行(xing)(xing)(xing)業中(zhong)(zhong)的(de)風(feng)道(dao)(dao)、煙(yan)道(dao)(dao)。