超低温(<150℃)SCR脱硝技术研究进展  

Recent progress on elimination of NOx from flue gas via SCR technology under ultra-low temperatures(<150℃)

作　　者：汤常金[1,2] 孙敬方 董林 TANG Changjin;SUN Jingfang;DONG Lin(School of Chemistry and Chemical Engineering,Center of Modern Analysis,Jiangsu Key Laboratory of Vehicle Emissions Control,Nanjing University,Nanjing 210023,Jiangsu,China;School of Environment,Nanjing Normal University,Nanjing 210023,Jiangsu,China)

机构地区：[1]南京大学化学化工学院,现代分析中心,江苏省机动车尾气污染控制重点实验室,江苏南京210023 [2]南京师范大学环境学院,江苏南京210023

出　　处：《化工学报》2020年第11期4873-4884,共12页CIESC Journal

基　　金：国家高技术研究发展计划项目(2015AA03A401);国家自然科学基金项目(21976081,21773106);新疆建设兵团重大科技项目(2018AA002);中央高校基本科研业务费专项资金(14380236)。

摘　　要：以氨为还原剂的选择性催化还原(SCR)技术是工业脱硝的主流技术。我国已形成在180~420℃(包含低温和中高温)范围内具有良好应用效果的SCR技术及其催化剂体系,但超低温段(<150℃)仍有待突破。超低温SCR脱硝通常位于“除尘-脱硫”工艺之后,具有烟气组成简单、能耗少、改造成本低等优点,吸引了研究人员的广泛关注。在简要分析不同行业烟气排放特征及治理现状的基础上,总结了150℃以下具有良好SCR活性的催化剂体系(锰基、钒基、铬基和活性炭基),重点对催化剂的抗水、硫、碱金属和硝铵中毒性能进行了探讨,并介绍了该领域最近的一些中试/侧线试验研究进展情况,最后对这一技术的未来发展方向进行了展望。Selective catalytic reduction of NO with NH3(NH3-SCR)is a well-established technology for eliminating NOx from stationary source.Over the past decades,great progress has been achieved in China in developing practical SCR catalysts that can work well in power plant and other fields like coking industry at low and medium temperature range(180—420℃).However,the extension of SCR technology to ultra-low temperatures(e.g.,<150℃),which can meet the requirement of flue gas treatment from diverse non-electricity fields like cement kiln and industrial boiler,is still a big challenge.Ultra-low temperature SCR denitrification is usually located after the“dust removal-desulfurization”process.It has the advantages of simple flue gas composition,low energy consumption,and low transformation cost,which has attracted wide attention from researchers.In this mini-review,we first give a brief introduction on the current status of flue gas control from different industrial fields.Then,the catalyst systems(MnOx,VOx,CrOx,activated carbon)that can provide good deNOx performance under 150℃are summarized,and the resistance property to H2O,SO2,alkali metals and ammonium nitrate species is emphasized.As well,the recent progress over pilot experiments for industrial application is introduced.Lastly,the prospect of ultra-low temperature SCR denitrification is discussed.

关 键 词：大气污染治理 烟道气 脱硝 超低温 选择性催化还原 煤燃烧 

分 类 号：TQ028.8[化学工程]