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與其他技術(shù)相比,SCR技術(shù)裝置結(jié)構(gòu)簡(jiǎn)單、不形成二次污染、技術(shù)成熟、脫硝效率高達(dá)90%、運(yùn)行可靠,是目前國(guó)際上應(yīng)用最為廣泛的煙氣脫硝技術(shù)。催化劑失效和尾氣中殘留NH3是SCR系統(tǒng)存在的兩大關(guān)鍵問(wèn)題。為確保催化劑層的理想條件,避免催化劑中毒、堵塞或磨損,運(yùn)用CFD軟件對(duì)SCR系統(tǒng)進(jìn)行流體力學(xué)模擬計(jì)算,對(duì)解決這些問(wèn)題有所幫助。</p><p> 2、選擇性非催化還原法(SNCR)</p><p> SNCR技術(shù)原理是在無(wú)催化劑存在的條件下向爐內(nèi)噴射化學(xué)還原劑使之與煙氣中的NOx反應(yīng),將其還原成N2及H2O。使用最廣泛的還原劑為氨或尿素,反應(yīng)溫度在900～1000℃范圍內(nèi)。其反應(yīng)式為:</p><p> 4NH3+4NO+O2=4N2+6H2O</p><p> 當(dāng)溫度過(guò)高時(shí),NH3將發(fā)生副反應(yīng),生成NO,反應(yīng)式如下:</p><p> 4NH3+5O2=4NO+6H2O</p><p> 溫度過(guò)低時(shí)反應(yīng)速度減慢,所以溫度的控制至關(guān)重要。該工藝不需要催化劑,但脫硝效率較SCR低。</p><p style="text-align: center;"><img src="/static/upload/image/20210401/1617266755697563.png" title="1617266755697563.png" alt="image.png"/></p> </p> </div> </div> </div> </div> </div>  </div> </div> <div id="ipipkrpq" class="container-layout bg-footnav bg-inverse padding-big-top padding-big-bottom clearfix"> <div id="ipipkrpq" class="padding container" 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