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脫硝技術

發布日期:2018-05-21 瀏覽次數:7100

1、技術核心

(1) 脫硝技術

A、 中低溫SCR脫硝技術

SCR中低溫脫硝工藝簡介

  焦爐煙道氣與設置在SCR反應器進口前的噴氨格柵噴出來的氨氣在煙道內里進行充分混合,然后混合好的煙氣從SCR反應器進口進入,經過煙氣均流器(對粘性顆粒物、焦油、硫酸氫銨等過濾)進入SCR反應區與中低溫催化劑進行SCR脫硝反應,脫除NOx后的煙氣從SCR反應器出口排出。當系統運行一定時間后,為了使催化劑活性穩定(防止催化劑表面沉積較多粘稠狀硫酸氫銨),采用原位再生熱解析系統對催化劑進行再生。中低溫脫硝工藝流程圖如下圖所示。


(1)  脫硝效率高,可達90%以上;

(2)  對焦爐負荷變化適應性強;

(3)  SO2/SO3轉化率和NH3逃逸率低;

(4)  所采用的催化劑溫度窗口寬、活性好、失活率低、壽命長;

(5)  脫硝系統氣流分布均勻,阻力小;

(6)  技術成熟,運行可靠,安全性高,便于安裝維護。

B、 脫硝除塵一體化技術


C、 回轉式換熱SCR脫硝技術

  低溫的燒結機煙氣先采用熱風爐進行升溫,再與設置在SCR反應器進口前的噴氨格柵噴出來的氨氣在煙道內里進行充分混合,然后混合好的煙氣從SCR反應器進口進入,經過煙氣均流器(對粘性顆粒物、硫酸氫銨等過濾)進入SCR反應區與中低溫催化劑進行SCR脫硝反應,脫除NOx后的達標煙氣再通過換熱器將溫度傳遞給未升溫的燒結機煙氣,再配合熱風爐升溫到指定溫度,再進行中低溫脫硝,如此循環處理煙氣。換熱后的達標氣體排放大氣中來。當系統運行一定時間后,為了使催化劑活性穩定(防止催化劑表面沉積較多粘稠狀硫酸氫銨),采用原位再生熱解析系統對催化劑進行再生。中低溫脫硝工藝流程圖如下圖所示。


D、 高溫SCR脫硝技術


E、 SNCR脫硝技術



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