目前，在我(wo)國大中型(xing)電站鍋爐機(ji)組的(de)煙氣脫硫系統中使用(yong)的(de)煙氣擋(dang)(dang)板門(men)主(zhu)要有雙(shuang)(shuang)葉(xie)(xie)片百(bai)(bai)(bai)葉(xie)(xie)窗(chuang)擋(dang)(dang)板門(men)、雙(shuang)(shuang)百(bai)(bai)(bai)葉(xie)(xie)窗(chuang)擋(dang)(dang)板門(men)、雙(shuang)(shuang)密封百(bai)(bai)(bai)葉(xie)(xie)窗(chuang)擋(dang)(dang)板門(men)等類(lei)型(xing)。其中以雙(shuang)(shuang)葉(xie)(xie)片百(bai)(bai)(bai)葉(xie)(xie)窗(chuang)擋(dang)(dang)板門(men)和雙(shuang)(shuang)百(bai)(bai)(bai)葉(xie)(xie)窗(chuang)擋(dang)(dang)板門(men)使用(yong)較(jiao)多。

1 雙(shuang)葉片百葉窗擋(dang)板門(men)（twin-blade louver damper）

該類型擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)由(you)(you)一扇百葉(xie)(xie)(xie)(xie)窗組成，百葉(xie)(xie)(xie)(xie)窗由(you)(you)兩片葉(xie)(xie)(xie)(xie)片組成，設置密封空氣(qi)系(xi)統(tong)，允許(xu)100%的(de)(de)密封空氣(qi)進(jin)入兩葉(xie)(xie)(xie)(xie)片之(zhi)間。這(zhe)種(zhong)煙氣(qi)擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)的(de)(de)優點在于其密封片具有自(zi)清潔功能(neng)，擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)的(de)(de)重量只有雙百葉(xie)(xie)(xie)(xie)窗擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)的(de)(de)一半左右(you)，投資費用(yong)也較雙百葉(xie)(xie)(xie)(xie)窗擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)節約了(le)50%。雙葉(xie)(xie)(xie)(xie)片百葉(xie)(xie)(xie)(xie)窗擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)的(de)(de)強度略低于雙百葉(xie)(xie)(xie)(xie)窗擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)，但就目前國內電(dian)(dian)(dian)廠(chang)煙氣(qi)脫硫系(xi)統(tong)的(de)(de)煙道運行壓力而言已完全能(neng)夠滿足。山東黃(huang)臺(tai)電(dian)(dian)(dian)廠(chang)旁(pang)路擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)、太(tai)原第二熱電(dian)(dian)(dian)廠(chang)FGD系(xi)統(tong)進(jin)出(chu)口及旁(pang)路擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)、重慶(qing)發電(dian)(dian)(dian)廠(chang)FGD系(xi)統(tong)進(jin)出(chu)口擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)等均采用(yong)了(le)此種(zhong)煙氣(qi)擋(dang)(dang)(dang)板(ban)(ban)(ban)門(men)(men)形(xing)式，實際運行效(xiao)果良好(hao)。

2 雙百葉窗擋板門(men)（double blade louver damper）

該(gai)類型的(de)(de)擋(dang)板(ban)(ban)(ban)(ban)門(men)由兩扇百(bai)(bai)(bai)葉(xie)窗(chuang)(chuang)組(zu)成，每扇百(bai)(bai)(bai)葉(xie)窗(chuang)(chuang)連接(jie)著若干軸承，兩片(pian)(pian)葉(xie)片(pian)(pian)固定在同一軸上。該(gai)種(zhong)擋(dang)板(ban)(ban)(ban)(ban)門(men)的(de)(de)密封(feng)片(pian)(pian)采(cai)用特殊(shu)的(de)(de)鎳基合金安裝在擋(dang)板(ban)(ban)(ban)(ban)門(men)葉(xie)片(pian)(pian)的(de)(de)周圍，設(she)置(zhi)(zhi)密封(feng)空氣(qi)系(xi)(xi)統(tong)(tong)，允許(xu)100%的(de)(de)密封(feng)空氣(qi)進入兩扇百(bai)(bai)(bai)葉(xie)窗(chuang)(chuang)之間(jian)。目前設(she)計(ji)的(de)(de)雙百(bai)(bai)(bai)葉(xie)窗(chuang)(chuang)擋(dang)板(ban)(ban)(ban)(ban)門(men)的(de)(de)密封(feng)氣(qi)體系(xi)(xi)統(tong)(tong)大(da)都可保(bao)證煙道管線的(de)(de)零(ling)滲漏率，并在系(xi)(xi)統(tong)(tong)載荷的(de)(de)情況下(xia)配有意外(wai)防范措(cuo)施。此種(zhong)擋(dang)板(ban)(ban)(ban)(ban)門(men)投資較大(da)，重量和(he)尺寸相對(dui)雙葉(xie)片(pian)(pian)百(bai)(bai)(bai)葉(xie)窗(chuang)(chuang)擋(dang)板(ban)(ban)(ban)(ban)門(men)也(ye)大(da)的(de)(de)多，是國內電(dian)(dian)站機組(zu)煙氣(qi)脫硫裝置(zhi)(zhi)中使用較早(zao)的(de)(de)類型。杭州(zhou)半(ban)山電(dian)(dian)廠、珞璜電(dian)(dian)廠二期工程旁(pang)路擋(dang)板(ban)(ban)(ban)(ban)門(men)均(jun)采(cai)用了雙百(bai)(bai)(bai)葉(xie)窗(chuang)(chuang)擋(dang)板(ban)(ban)(ban)(ban)門(men)。