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唐山鋼廠燒結SCR脫硝技術在實際應用中脫硝效率高且運行穩定

19

发表时间：2020-08-19 08:21

SCR脱硝系统阻力小，能耗和运行费用低等优点。系统应用于钢铁集团1#，烧结脱硝项目，也是首套采用低温SCR脱硝技术的烧结烟气处理项目，2018年10月投运，至今稳定达标运行。同样入选实用技术“烧结机头烟气低温（180℃）SCR脱硝系统”脫硝工藝采用選擇性催化還原方法，該反應發生在裝有催化劑的反應器裏，煙氣與噴入的氨在催化劑的作用下反應，實現脫出氮氧化合物。煙氣中的氮氧化合物通常由

4NO + O₂+ 4NH₃→ 4N₂ + 6 H₂O

2NO₂+ O₂+ 4NH₃→ 3N₂ + 6 H₂O

1NO₂+ 1 NO + 2NH₃ → 2N₂ + 3H₂O

煙氣從窯爐出來，進入垂直布置的SCR反應器裏，在反應器裏煙氣向下流過均流器、催化劑層，經過煙囪達標後排入大氣。

SCR反應器出口煙道折回，在進入空預器進口，SCR反應器入口、設置加溫控制系統，保證脫硝溫度穩定在350度左右。

煙道設置必要的測點接管座，便于試運行和運行中進行測量(溫度測量和采樣)。此外，安裝足夠的管座用于監控系統的啓動。管座的布置方式滿足測量需要。

高分子222.jpg 氧化镁脱硫.jpg

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