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脫硝技術瓶頸在于創新不夠技術被濫用導致效率低

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发表时间：2020-08-06 08:49

　　多年環保（脫硫，脫硝，除塵）經驗而言，粉塵治理難度低，目前國內很多企業基本能夠做到10mg/m3的排放標准，即使未來粉塵排放標准進一步嚴格，也基本能夠應對；二氧化硫治理方面，但由于水泥生産工藝本身具備脫硫特性，因此國內企業大約僅有一半需要加裝脫硫設施。雖然投資成本較大，但脫硫效果非常明顯，實現超低排放問題不大。氮氧化物的治理難度高，目前國內脫硝技術流派衆多，但是真正實現穩定運行並達到地方超低排放要求的屈指可數，氮氧化物減排也成爲了限制當前水行業超低排放推進的關鍵。

SCR脱硝处理原理SCR脱硝是在催化剂的作用下，还原剂( 氨气)与烟气中的氮氧化物反应生成无害的氮气和水，从而去除烟气中的NOx。选择性是指还原剂NH3和烟气中的NOx发生还原反应，其主要反应式如下。4NO + 4NH3 + O2→4N2 + 6H2O( 主要反应)2NO2 + 4NH3 + O2→3N2 + 6H2O二、催化剂的分类和应用催化剂是SCR脱硝工艺的核心，催化剂的反应温度主要分为高温、中温、中低温、低温。

　　應用廣的是高溫催化劑和中溫催化劑，脫硝效率高，應用條件廣泛。表1爲催化劑的主要應用情況。國內焦化行業目前使用較多的是中低溫催化劑，低溫催化劑使用較少，低溫SCR能大限度地降低煙氣升溫所需的能源消耗，減少一次投資。三、低溫SCR脫硝面臨的困難1.焦爐煙氣中的二氧化硫在SCR催化劑的作用下會轉化爲三氧化硫，在180～230℃範圍內三氧化硫極易與氨氣發生反應生成硫酸氫铵，並吸附在催化劑表面，降低脫硝效率。

上一篇兩岸環境治理合作共贏脫硫脫硝技術加強合作和交流

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