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脫硫、脫硝、除塵、煙氣治理的必要措施

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发表时间：2020-09-09 08:39

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，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，李俊華表示，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。該項目二級深度脫酸采用小蘇打幹法脫硫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。

因此净化后的烟气温度不会低于酸结露而引起腐蚀现象，同时不会在烟囱周围产生酸雨。脱硫脱硝系统温降小，约为20℃，不影响后续余热锅炉工艺流程。SDS脱硫工艺具有良好的调节特性，脱硫装置运行及停运不影响焦炉的连续运行状态，脱硫系统的负荷范围与焦炉负荷范围相协调，保证脱硫系统可靠稳定地连续运行SCR中低温脱硝工艺特点焦炉烟道烟气脱硫后采用中低温脱硝催化剂进行脱硝，该催化剂具有催化反应温度窗口宽。全流程烟气温度始终远远高于水结露温度及酸结露温度SO2 转化率和NH3 逃逸率低，抗硫性好，脱除效率高，比表面积大，结构强度高，寿命长等特点。

77777 (1).jpg 脱硝分配系统.jpg

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下一篇SCR脫硝與SNCR脫硝加SDS納基幹法脫硫協同工作

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