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真正實現絕對脫硫脫硝超低排放還是的采取組合式脫硝技術

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发表时间：2020-07-06 08:23

水泥窯SNCR脫硝技術是目前能夠適應我國水泥爐窯工況，能滿足新的排放標准和國內市場需求的一種煙氣脫硝工藝，其主要原理是在沒有催化劑的條件下，在850~1050℃的溫度範圍內，把還原劑（氨氣或尿素）噴入水泥爐窯內，還原劑與爐窯中的氮氧化物（主要是一氧化氮和二氧化氮）發生化學反應，生成氮氣和水，從而減少煙氣中氮氧化物的排放，且無二次汙染物生成。

該項目二級深度脫酸采用小蘇打幹法脫硫，脫硝除塵采用脫硝脫除塵一體化反應器，升溫采用換熱器+熱風爐聯合換補熱，一體化設計，工藝簡潔，操作簡單，維護方便，催化脫硝濾袋使用壽命長，運行成本低，合茬時間短，完美解決了燒結煙氣的超低排放問題，是鋼鐵行業煙氣治理技術的一次創新，值得在全行業推廣。

要達到上述標准，要麽通過組合式的半幹法脫硫和中低溫脫硝工藝，通過高溫SCR加上濕法脫硫，理論上保證10毫克/立方米，35毫克/立方米，50毫克/立方米的排放目標，但目前鋼鐵燒結煙氣普遍低于180度，不管中低溫還是高溫SCR，都需要對能源消耗和成本提出要求。要麽通過多汙染物協同控制技術，利用活性炭催化劑進行多汙染物控制。

煙氣中SO2等汙染物被吸附在活性焦內脫除，淨煙氣外徘。吸附SO2達到飽和的活性焦，輸送到解析塔進行加熱再生，回收高濃度SO2混合氣體，送入硫回收系統制備硫酸回用。若注入氨會發生選擇性和非選擇性催化還原反應，將NOx還原爲N2和H2O。注氨有助于提高活性焦的脫硫活性，降低活性焦的消耗。活性焦幹法脫硫脫硝一體化技術。是利用活性焦物理和化學吸附特性。將汙染物脫除的幹法煙氣處理技術。適宜溫度爲120-160℃的煙氣進入吸附塔。

玻璃厂尾部低温脱硝.png

上一篇SNCR脫硝設備的脫硝效率與鍋爐自身結構密切相關

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