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SNCR

发表时间：2017-03-21 00:00

SNCR(選擇性非催化還原)。

英文名称 selective non-catalytic reduction

選擇性非催化還原是指无催化剂的作用下，在适合脫硝反應的“溫度窗口”內噴入還原劑將煙氣中的氮氧化物還原爲無害的氮氣和水。该技术一般采用炉内喷氨、尿素或氢氨酸作为還原劑还原 NOx 。還原劑只和烟气中的 NOx反应，一般不与氧反应，该技术不采用催化剂，所以这种方法被称为選擇性非催化還原法（SNCR）。由于该工艺不用催化剂，因此必须在高温区加入還原劑。還原劑喷入炉膛温度为 850 ~ 1100℃ 的区域，迅速热分解成 NH3，与烟气中的NOx反应生成N2和水。

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