低温催化剂在不锈钢酸洗NO_x废气SCR处理的应用  

Application of low temperature catalyst in SCR treatment of NO_x waste gases in stainless steel pickling line

作　　者：孙宇 张增胜 范建伟[2] 

机构地区：[1]上海同济科蓝环保设备工程有限公司,上海200092 [2]同济大学环境科学与工程学院,上海200092

出　　处：《中国冶金》2015年第12期59-63,共5页China Metallurgy

摘　　要：研究以堇青石蜂窝陶瓷为载体,过渡金属元素为活性成分,利用纳米组装和灌注的方法将金属盐注入介孔分子筛的孔道中制备了一种在低温状态下具有高效脱硝性能的复合催化剂,且命名为GJ-HC-4型催化剂,高效反应温度区间为200~300℃。针对不锈钢混酸酸洗NO_x废气低温、低尘、高氧化度、高浓度的特点,选用GJ-HC-4型低温催化剂,采用"喷淋吸收+预热+换热+加热+SCR反应+换热"的工艺。在现场设定反应温度为260℃的条件下,连续运行脱硝效率均高于95%,烟囱出口NO_x浓度均低于150mg/m^3。与V_2O_5/TiO_2系催化剂相比较,GJ-HC-4型催化剂在保证处理效率的前提下,具有非常优越的节能环保效应。In this study,a kind of composite catalyst（named as GJ-HC-4）with high denitration performance at low temperature was prepared by injecting metallic compounds into the channels of mesoporous molecular sieve using the method of nanoparticle assembly and perfusion.The cordierite honeycomb ceramics was used as supports,while the transition metal elements were used as the active ingredients.The high-efficiency reaction temperature range of GJHC-4catalyst was 200-300℃.According to the characteristics of NOxexhaust in pickling such as low temperature,low dust,high oxidation degree and high concentration,the process of＂spray absorption＋ preheating＋ heat exchange＋ heating＋ SCR reaction＋ heat exchange＂was adapt using GJ-HC-4catalyst.Under the reaction temperature setting at 260℃in site,the denitration efficiency in continuous operation was always higher than 95%.The NOx concentration in the outlet of chimney was lower than 150mg/m^3.Compared with V2O5/TiO2 catalysts,the GJ-HC-4catalyst exhibited superior performance in energy saving and environmental protection on the premise of guaranteeing the denitration efficiency.

关 键 词：不锈钢酸洗 NOX废气 SCR GJ-HC-4型 低温催化剂 节能环保 

分 类 号：X757[环境科学与工程—环境工程] O643.36[理学—物理化学]