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傳統SNCR脫硝技術改良可以實現脫硝效率瓶頸

14

发表时间：2020-06-28 08:02

山東某公司現有3台額定出力爲240t/h高溫高壓燃煤鍋爐，于2014年建成投産。2016年，公司對該三台CFB爐進行了SNCR脫硝改造，使鍋爐煙氣中NOx濃度值降低到100mg/Nm³以下。鍋爐脫硫采用爐內加鈣方式，脫硫效率90%左右，鍋爐煙氣中SO₂濃度低于200mg/Nm³，基本滿足了《火電廠大氣汙染排放標准》^[1]（一般地區）和《山東省區域性大氣汙染物綜合排放標准》^[2]第三時段規定的要求。

然而，隨著環保標准的不斷升級，該三台CFB爐的煙氣汙染物排放濃度不能達到國家標准《火電廠大氣汙染排放標准》重點地區特別排放限值、《山東省區域性大氣汙染物綜合排放標准》第四時段（2020年1月起）、“天然氣鍋爐排放標准”的要求。因此，對該三台CFB鍋爐采用循環流化床幹法脫硫+COA協同氧化脫硝技術改造，使煙氣中NOx濃度≤50mg/Nm³，SO₂濃度≤35mg/Nm³，以滿足新環保標准之要求。

我公司針對這一特殊情況對原有SNCR爐內脫硝進行改造，采用特殊高壓液體輸送裝置進行供液，對噴槍進行改良，使噴槍霧化粒徑更細更小，噴射覆蓋面積更廣。從而在鍋爐內部形成立體截面。從而煙氣和脫硝劑反應更充分，減少沒有完全反應得氨逃逸，事實證明傳統的SNCR脫硝工藝可以通過技術改良突破脫硝效率瓶頸。通過觀察穩定運行下氮氧化物＜50mg/m?。

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