改性飞灰作为SCR催化剂载体的成型方法和脱硝活性  

De-NOx Performance of Modified Fly Ash Supporting SCR Catalyst Under Various Molding Techniques

作　　者：孙旭光[1] 云端[1] 张鹏[1] 郭鲁阳[2] 姚强[1] 

机构地区：[1]清华大学热能工程系,北京100084 [2]山东电力研究院,济南250021

出　　处：《燃烧科学与技术》2010年第2期133-136,共4页Journal of Combustion Science and Technology

摘　　要：以改性飞灰为载体负载金属氧化物的SCR(选择性催化还原)催化剂已经在实验室里取得了较好的脱硝效果,要达到工业应用的条件,首要解决的是载体的成型问题.对黏结法、低温烧结法和复合挤压法了3种典型的成型方法进行了对比.研究发现,改性飞灰和γ-Al2O3经复合挤压成型后,比表面积有了大幅度提高,且强度也能够满足作工业催化剂载体的要求;复合载体负载CuO后,脱硝效率可以达到90%以上,高效温度区间也较宽,从而在应用前景上要好于单纯改性飞灰类催化剂.The low-cost SCR catalyst by using modified fly ash as a supporter of active metal oxides has achieved good results of de-NOx in the laboratory studies. The molding method of modified fly ash plays an important role in the scale-up of this technology from laboratory to industrial application is concerned. A comparison of three typical molding techniques, agglutinating, low-temperature sintering and composite extrusion, was performed. It is found that mixed modified fly ash and γ-alumina after the extrusion process can achieve wide surface area and high intensity, which meets the requirements of industrial application. When the modified fly ash composite is used to support CuO as a SCR catalyst, the de-NOx efficiency exceeds 90% and a wide temperature window for highefficiency reduction is obtained, which has a promising prospect for industrial de-NOx.

关 键 词：改性飞灰 成型 脱硝效率 选择性催化还原 

分 类 号：TK16[动力工程及工程热物理—热能工程] X511[环境科学与工程—环境工程]