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燒結機煙氣中低溫SCR脫硝工藝

技術路線一:半干法/干法脫硫+中低溫SCR脫硝

  該技術路線為先脫硫后脫硝,燒結機出口煙氣通過電除塵、半干法/干法脫硫后進入回轉式GGH,再將此煙氣通過高爐煤氣燃燒器進行補燃,加熱到活性溫度,然后進入脫硝SCR反應器,完成預定的脫硝過程,脫硝后的凈煙氣再次進入回轉式GGH,將熱量傳遞給剛開始的低溫煙氣,凈煙氣通過引風機排至煙囪。

技術路線二:中高溫SCR脫硝+濕法脫硫

  該技術路線為先脫硝后脫硫,煙氣燒結機出口煙氣通過電除塵進入回轉式GGH,再將此煙氣通過高爐煤氣燃燒器進行補燃,加熱到活性溫度,然后進入脫硝SCR反應器,完成預定的脫硝過程,脫硝后的煙氣再次進入回轉式GGH,將熱量傳遞給剛開始的低溫煙氣。脫硝后的煙氣進入濕法脫硫工藝,完成預定的脫硫過程,脫硫后的凈煙氣直排到大氣中。

技術路線三:濕法脫硫+冷凝除塵除霧裝置(或濕式電除塵)+中低溫SCR脫硝

  該技術路線為先脫硫后脫硝,煙氣燒結機出口煙氣通過電除塵、濕法脫硫、冷凝除塵除霧裝置(或濕式電除塵)進入回轉式GGH,再將此煙氣通過高爐煤氣燃燒器進行補燃,加熱到活性溫度,然后進入脫硝SCR反應器,完成預定的脫硝過程,脫硝后的煙氣再次進入回轉式GGH,將熱量傳遞給剛開始的低溫煙氣。脫硝后的煙氣經過GGH出口溫度不小于90℃,高于煙氣露點15~20℃,以防煙囪雨及大白煙拖尾現象。凈煙氣通過引風機排至煙囪。


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