SCR脫硝
選擇性催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)還(huan)原(yuan)(yuan)(yuan)（Selective Catalytic Reduction,SCR）脫(tuo)(tuo)硝(xiao)(xiao)(xiao)，是指(zhi)在催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji)的(de)(de)(de)作用下，利用液(ye)氨、氨水(shui)、尿(niao)素(su)溶液(ye)等還(huan)原(yuan)(yuan)(yuan)劑(ji)(ji)(ji)“有(you)(you)選擇性”地與煙(yan)(yan)氣(qi)(qi)中(zhong)(zhong)(zhong)的(de)(de)(de)NOx反應(ying)(ying)(ying)(ying)(ying)，生(sheng)成(cheng)氮氣(qi)(qi)（N2）和(he)水(shui)（H2O）。 SCR脫(tuo)(tuo)硝(xiao)(xiao)(xiao)系統(tong)的(de)(de)(de)主要(yao)組成(cheng)部分：氨儲(chu)存(cun)和(he)供(gong)應(ying)(ying)(ying)(ying)(ying)、SCR反應(ying)(ying)(ying)(ying)(ying)器(qi)(qi)、SCR脫(tuo)(tuo)硝(xiao)(xiao)(xiao)還(huan)原(yuan)(yuan)(yuan)劑(ji)(ji)(ji)、SCR脫(tuo)(tuo)硝(xiao)(xiao)(xiao)催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji)。 氨儲(chu)存(cun)和(he)供(gong)應(ying)(ying)(ying)(ying)(ying) 存(cun)儲(chu)：液(ye)氨氨區(qu)，氨水(shui)罐。 氨氣(qi)(qi)經(jing)過(guo)(guo)流量控制閥(fa)后(hou)(hou)進(jin)(jin)(jin)(jin)入氨/空氣(qi)(qi)混合(he)器(qi)(qi)，以(yi)5%的(de)(de)(de)濃度進(jin)(jin)(jin)(jin)行稀釋混合(he)后(hou)(hou)，進(jin)(jin)(jin)(jin)入閥(fa)門站組，經(jing)氨噴(pen)射格柵(zha)(zha)（AIG）或(huo)噴(pen)槍噴(pen)射到反應(ying)(ying)(ying)(ying)(ying)器(qi)(qi)前的(de)(de)(de)煙(yan)(yan)道(dao)中(zhong)(zhong)(zhong)。 SCR反應(ying)(ying)(ying)(ying)(ying)器(qi)(qi) 鍋爐(lu)或(huo)窯爐(lu)的(de)(de)(de)出口(kou)煙(yan)(yan)氣(qi)(qi)（有(you)(you)的(de)(de)(de)經(jing)過(guo)(guo)脫(tuo)(tuo)硫塔(ta)、除塵器(qi)(qi)之后(hou)(hou)）通過(guo)(guo)SCR進(jin)(jin)(jin)(jin)口(kou)煙(yan)(yan)道(dao)與氨噴(pen)射格柵(zha)(zha)（AIG）注入的(de)(de)(de)氨氣(qi)(qi)經(jing)過(guo)(guo)充分混合(he)后(hou)(hou)，進(jin)(jin)(jin)(jin)入反應(ying)(ying)(ying)(ying)(ying)器(qi)(qi)。在催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji)的(de)(de)(de)作用下，NOx與NH3進(jin)(jin)(jin)(jin)行氧化(hua)(hua)(hua)還(huan)原(yuan)(yuan)(yuan)反應(ying)(ying)(ying)(ying)(ying)，終生(sheng)成(cheng)N2和(he)H2O。 SCR脫(tuo)(tuo)硝(xiao)(xiao)(xiao)還(huan)原(yuan)(yuan)(yuan)劑(ji)(ji)(ji) 還(huan)原(yuan)(yuan)(yuan)劑(ji)(ji)(ji)主要(yao)有(you)(you)三種(zhong)：液(ye)氨、氨水(shui)、尿(niao)素(su)。 SCR脫(tuo)(tuo)硝(xiao)(xiao)(xiao)催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji) 催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji)從(cong)性能(neng)可分為(wei)：高溫催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji)、中(zhong)(zhong)(zhong)溫催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji)、低(di)溫催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji)。 催(cui)(cui)(cui)(cui)化(hua)(hua)(hua)劑(ji)(ji)(ji)從(cong)形式分為(wei)三種(zhong)：平板式、蜂(feng)窩(wo)式、波紋板式。 用氨水(shui)做還(huan)原(yuan)(yuan)(yuan)劑(ji)(ji)(ji)的(de)(de)(de)化(hua)(hua)(hua)學(xue)反應(ying)(ying)(ying)(ying)(ying)： 4NO+4NH3+O2→4N2+6H2O 4NH3+2NO2+O2→3N2+6H2O NO2+NO+2NH3→2N2+3H2O
