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大同煤礦4台40噸鍋爐SNNCR脫硝

16

发表时间：2020-06-26 08:33

我公司19年9月在山西大同煤礦脫硝項目、經過實地踏勘，查看了鍋爐工況曆史曲線，並與鍋爐操作人員進行深入的交流，並查看了鍋爐實際構造，了解了鍋爐在供暖期間4個月的負荷變動情況，選取了鏈條爐爐膛前拱和後拱交彙的上方區域作爲SNCR噴射區域。

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技术，即选择性非催化还原技术，它是目前主要的烟气脱硝技术之一。在炉膛800~1250℃这一窄的溫度範圍內、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，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的主要反應爲：NH3爲還原劑用

不同还原剂有不同的反应溫度范围，此溫度范围称为溫度窗。当反应溫度过高时，由于氨的分解会使NOx还原率降低，另一方面，反应溫度过低时，氨的逃逸增加，也会使NOx还原率降低。SNCR工艺技术的关键就在于，还原剂喷入系统必须尽可能地将还原剂喷入到炉内最有效溫度窗区域内，即尽可能的保证所喷入的还原剂在合适的溫度下与烟气进行良好的混合，这样一方面可以提高还原剂利用率，另外一方面可以控制获得较小的氨逃逸。

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