携带流燃烧时SCR催化剂碱金属失活机理研究  

Research on Mechanism of the SCR Catalyst Deactivation by Alkali Metal During Entrained-Flow Combustion

作　　者：刘璇[1] 邓磊[1] 曹培庆 吕强[1] 王长安[1] 白杨 杜勇博 车得福[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]神华国能(神东电力)公司技术研究院,西安710065

出　　处：《工程热物理学报》2016年第2期448-453,共6页Journal of Engineering Thermophysics

基　　金：2014年陕西省博士后科研项目资助

摘　　要：采用携带流燃烧法研究了不同的碱金属种类、碱金属浓度、K和Na混合对催化剂脱硝活性的影响,并通过多种物理化学表征方法对催化剂碱金属失活机理进行了分析。结果表明,碱金属K、Na使得催化剂失活机理类似,且K盐对催化剂的失活效果要强于Na盐,Cl^-、SO_4^(2-)、CO_3^(2-)三种阴离子使得催化剂脱硝活性降低的能力顺序为:Cl->SO_4^(2-)>CO_3^(2-);掺烧碱金属使催化剂失活后,催化剂表面有所掺烧的碱金属盐沉积,并堵塞表面孔道,造成比表面积下降。催化剂碱金属失活后其表面活性成分V的含量大幅下降。In this study,the effect of alkali metal deposition on denitrification activity of selective catalytic reduction（SCR） catalyst was investigated via entrained-flow combustion method.In addition,the alkali metal deactivation mechanism was analyzed through a variety of physical and chemical characterization.The results show that the deactivation mechanism of K and Na is similar.The effect of K on catalyst deactivation is stronger than that of Na.The effects of three kind of anion on catalyst deactivation are ordered by Cl^-SO_4^（2-）CO_3^（2-）.After exposing to alkali metals,the pores on catalyst surface are partially blocked,leading to the decrease of the specific surface area.And the content of V on the catalyst surface decreases dramatically.

关 键 词：携带流 燃烧 SCR催化剂 碱金属失活 

分 类 号：TK16[动力工程及工程热物理—热能工程]