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山東大恒能源


低氮燃燒器

    國內外的燃煤電站采取了多種方法來降低NOx的排放量。目前能夠實際應用于電廠燃煤鍋爐的主要分為兩部分,首先通過控制燃燒條件來降低NOx的生成量并促進已生成的NOx的破壞和還原的低氮燃燒技術;燃燒過程后采用煙氣脫硝技術進一步降低氮氧化物排放。

     

        由于我國煤種復雜,不同煤種組分性質差異較大,這對低氮燃燒技術模式化推進帶來挑戰。尤其針對揮發分低、灰分高的劣質煙煤和貧煤,低氮燃燒改造后,出現結焦、滅火、燃燒不穩定等問題。因此對于燃燒劣質煤種的鍋爐,要充分結合其煤質特性和系統特性進行低氮燃燒改造。

     

    低氮燃燒技術特點:

        1.增強燃燒器出口氣流對爐膛深處高溫煙氣的卷吸能力,推遲一、二次風混合,高溫對煤粉氣流進行充分加熱;

        2.著火特性好,燃燒穩定,爐膛負壓波動小;

        3.燃燒器及水冷壁不結焦燒壞,延長燃燒器使用壽命;

        4.飛灰含碳量低,保證較高的鍋爐燃燒效率;

        5.鍋爐出口煙氣中的NOx排放濃度減小,降低煙氣脫硝成本;

        6.適用于低揮發分煤燃燒;在空干基揮發份12%~18%,熱值15~20MJ/kg,都可以保證上述性能指標;

        7.可分為劣質煤直流低氮燃燒器改造、劣質煤旋流燃燒器低氮改造。

     


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    國內外的燃煤電站采取了多種方法來降低NOx的排放量。目前能夠實際應用于電廠燃煤鍋爐的主要分為兩部分,首先通過控制燃燒條件來降低NOx的生成量并促進已生成的NOx的破壞和還原的低氮燃燒技術;燃燒過程后采用煙氣脫硝技術進一步降低氮氧化物排放。

     

        由于我國煤種復雜,不同煤種組分性質差異較大,這對低氮燃燒技術模式化推進帶來挑戰。尤其針對揮發分低、灰分高的劣質煙煤和貧煤,低氮燃燒改造后,出現結焦、滅火、燃燒不穩定等問題。因此對于燃燒劣質煤種的鍋爐,要充分結合其煤質特性和系統特性進行低氮燃燒改造。

     

    低氮燃燒技術特點:

        1.增強燃燒器出口氣流對爐膛深處高溫煙氣的卷吸能力,推遲一、二次風混合,高溫對煤粉氣流進行充分加熱;

        2.著火特性好,燃燒穩定,爐膛負壓波動小;

        3.燃燒器及水冷壁不結焦燒壞,延長燃燒器使用壽命;

        4.飛灰含碳量低,保證較高的鍋爐燃燒效率;

        5.鍋爐出口煙氣中的NOx排放濃度減小,降低煙氣脫硝成本;

        6.適用于低揮發分煤燃燒;在空干基揮發份12%~18%,熱值15~20MJ/kg,都可以保證上述性能指標;

        7.可分為劣質煤直流低氮燃燒器改造、劣質煤旋流燃燒器低氮改造。

     


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