SCR脱硝过程中副产物的生成与控制研究  

Control and research on the by-product generated in the process of SCR denitrification

作　　者：马双忱[1] 邓悦[1] 吴文龙 张立男 马京香[1] 

机构地区：[1]华北电力大学环境科学与工程学院,河北保定071003 [2]国网河南省电力试验研究院,河南郑州450052

出　　处：《电力科技与环保》2015年第6期12-15,共4页Electric Power Technology and Environmental Protection

基　　金：国网河南省电力公司电力科学研究院资助项目"SCR脱硝系统投运后空预器堵塞防治技术研究及应用"(SJTYHT/13-GS-178)

摘　　要：论述了SCR脱硝催化剂特点,介绍了SCR脱硝反应的V_2O_5/TiO_2催化剂的脱硝性能,通过分析得出SCR脱硝系统中的反应物是按照Eley-Rideal机理(即E-R机理)参与反应。探讨了SCR脱硝过程中的副产物,如SO_3的形成、NH3逃逸及ABS(硫酸氢铵)的形成原因,总结了ABS的相关温度研究进展以及ABS对催化床和空预器等的腐蚀与危害。提出了可通过喷入碱性吸收剂(如CaO、MgO等)控制SO_3量、调整NH_3/NO_x摩尔比来降低氨逃逸、合理控制反应温度并进行适当的空预器改造来减缓脱硝副产物ABS的生成。The SCR denitrification catalyst ＇s characteristic is discussed comprehensively. V_2O_5/ TiO_2 catalyst ＇s denitrification performance and the reaction mechanism are introduced,which is one of the best denitrification catalysts in the SCR reaction,concluded by analyzing the reactant that SCR denitrification system in accordance with the mechanism of Eley-Rideal（ the mechanism of E-R） to participate in the reaction. The side effects in SCR denitrification process are discussed,such as the formation of SO_3,NH_3 slip,and the reasons for the formation of ABS（ ammonium bisulfate） and mechanism of ABS affecting catalyst activity are summarized. Proposed controlling the output of SO_3 by injection of alkaline absorbents（ e. g. Ca O,Mg O,etc.）,adjust NH_3/ NO_x molar ratios to reduce the amount of ammonia slip and reasonable controlling of the reaction temperature and proper air preheater reformation to slow down the formation of ABS,ABS is one of important by-products in the SCR denitrification system.

关 键 词：脱硝 钒基催化剂 SCR ABS 

分 类 号：X701.7[环境科学与工程—环境工程]