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山西大同4台60噸鏈條爐脫硝

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发表时间：2020-06-26 08:45

　　根據廠家提供的相關數據，NO_X原始排放濃度400mg/Nm³及要求NO_X排放濃度穩定在200mg/Nm³以下。結合目前國內主流脫硝工藝有SCR脫硝、SNCR脫硝。SCR脫硝工藝脫硝率在90％以上，雖然脫硝率高，但耗資及工程量巨大。

綜合上述概況，脫硝工藝選用SNCR脫硝工藝，SNCR脫硝率雖然沒有SCR脫硝率高，但SNCR脫硝工藝的特點是，整體項目投資低，工程項目施工時間短，設備占地面積小，不對鍋爐做任何改動。我公司結合國內外對SNCR脫硝工藝的特點。自主研發的新一代SNCR脫硝模塊化設備，在脫硝率上根據不同爐型達到60-85％之間。設備特點是，高度集成，占地面積小，預先在廠內調試完畢，現場只需連接相應的管道和電纜，縮短施工時間。一般脫硝設備制作周期1周，施工時間只在2周左右。

SNCR技術，即選擇性非催化還原技術，它是目前主要的煙氣脫硝技術之一。在爐膛800~1250℃這一狹窄的溫度範圍內、無催化劑作用下，NH3或尿素等氨基還原劑可選擇性地還原煙氣中的NOx，基本上不與煙氣中的O2作用，據此發展了SNCR煙氣脫硝技術。在800~1250℃範圍內，NH3或尿素還原NOx的方式。

　　不同還原劑有不同的反應溫度範圍，此溫度範圍稱爲溫度窗。當反應溫度過高時，由于氨的分解會使NOx還原率降低，另一方面，反應溫度過低時，氨的逃逸增加，也會使NOx還原率降低。SNCR工藝技術的關鍵就在于，還原劑噴入系統必須盡可能地將還原劑噴入到爐內最有效溫度窗區域內，即盡可能的保證所噴入的還原劑在合適的溫度下與煙氣進行良好的混合，這樣一方面可以提高還原劑利用率，另外一方面可以控制獲得較小的氨逃逸。

上一篇大同煤礦4台40噸鍋爐SNNCR脫硝

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