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![SCR脫硝](static/picture/1_1PI1242.jpg)
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SCR脫硝在還(hái)原劑(NH3)的催化作用下,將(jiāng)煙氣中NOx還(hái)原爲氮氣和水。“選擇性”指氨有選擇地將(jiāng)NOx進(jìn)行還(hái)原的反應。SCR裝置一般布置在鍋爐省煤器出口與空氣預熱器入口之間,催化反應溫度在300℃~400℃。
SCR系統結構:
七個系統組成(chéng):氣體進(jìn)料系統、液體進(jìn)料系統、預熱系統、反應系統、冷凝分離系統、采樣分析系統和尾氣淨化系統。
工藝特點:
1.技術成(chéng)熟、應用廣泛;
2.脫氮效率80~90%;
3.能(néng)SO2轉化爲SO3,轉化率小于1%,降低吸收塔出口腐蝕;
4.SCR脫硝系統氨逃逸量小于3ppm,使還(hái)原劑的耗量達到優化;
5.反應後(hòu)副産物爲氮氣和水,沒(méi)有二次污染。
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