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活性焦干法煙氣脫硫

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脫硫工藝原理

  活性焦脫硫是利用活性焦吸附煙氣中的SO2,在煙氣中氧氣、水蒸汽存在的條件下,氧化為硫酸而吸附在活性焦孔隙內的煙氣凈化技術。

  吸附SO2后的活性焦在加熱的情況下,釋放出濃度大于20%的SO2的混合氣體,活性焦恢復吸附性能,重新投入脫硫塔循環使用。

  活性焦再生過程中產生的高濃度SO2混合氣體進入副產物利用系統進行資源化回收。

     

脫硝原理

  按適宜的氨氮比加入NH3,主要發生選擇性催化還原反應生成N2和H20,脫除N0x;

    

二噁英脫除原理

  通過利用活性焦的吸附功能將煙氣中的二噁英吸附在活性焦微孔中,物料循環過程中磨損產生的碎焦粉  通過叫高溫爐分解二嗯英達到徹底脫除,同時系統連續補充新鮮活性焦,可確保系統內吸附的污染物不會富集。

重金屬脫除原理

  重金屬一般以多種化合物的形式吸附于活性焦的微孔中,特別是硫酸鹽或氯化物,以汞為例表示如下:

     

  高溫解吸出的汞蒸氣隨再生氣體一起進入制酸系統,經洗滌后脫除。

 

工藝流程

  活性焦脫硫系統由活性焦吸附脫硫裝置、解吸再生系統、脫硫劑輸送系統和SO2氣體加工處理系統組成。脫硫塔和再生塔是整個系統工藝的核心。

  煙氣通過活性焦吸附脫硫裝置被凈化而排空,吸附SO2達到飽和的活性焦移動至解吸再生系統加熱再生,再生中回收的高濃度SO2混合氣體送入副產品轉化設備,解吸過的活性焦經篩選后由脫硫劑輸送系統送入吸附脫硫裝置再次進行吸附,活性焦得到循環利用,同時根據需要補充適量的新鮮活性焦。破損活性焦顆粒可用于工業廢水凈化等。再生系統的加熱方式可根據業主的具體情況來選擇蒸汽、電加熱器、熱風爐等方式。

  

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活性焦干法煙氣脫硫
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