含钡SCR脱硝催化剂运行后的再生研究

发布时间：2018-03-23 06:31

本文选题：烟气脱硝　切入点：选择性催化还原　出处：《中国电力》2016年11期 　论文类型：期刊论文

【摘要】：对失活SCR催化剂进行再生处理,有利于提高电厂经济效益和环境保护。以国内某电厂运行后活性下降的含钡SCR脱硝催化剂为研究对象,采用3种方法(氢氧化钠-柠檬酸联合清洗、稀硫酸清洗和硫酸铵溶液清洗)分别对该催化剂进行再生处理,测试了再生前后样品的活性,并采用各类表征方法分析该类型SCR催化剂活性下降的原因及其经过再生处理后的性能恢复情况,同时比较了不同方法的再生效果。结果表明:硫酸钡和钾、钠等杂质在运行后催化剂表面的沉积,是引起催化剂活性下降的主要原因。3种再生方法能不同程度地去除催化剂表面的钠、钾等杂质元素,再生后的催化剂在不同氨氮摩尔比时脱硝效率均有明显提高,其中硫酸铵溶液清洗法对催化剂的再生效果最为理想。
[Abstract]:The regeneration of deactivated SCR catalyst is beneficial to the economic benefit and environmental protection of power plant. The barium containing SCR denitrification catalyst with decreased activity after operation in a power plant in China is taken as the research object. The catalyst was regenerated by three methods (sodium hydroxide-citric acid combined cleaning, dilute sulfuric acid cleaning and ammonium sulfate solution cleaning). The activity of the samples before and after regeneration was tested. Various characterization methods were used to analyze the reasons for the decline of the activity of this type of SCR catalyst and the performance recovery after regeneration. The regeneration effects of different methods were compared. The results showed that: barium sulfate and potassium sulfate, The deposition of impurities such as sodium on the catalyst surface after operation is the main reason for the decrease of catalyst activity. 3 kinds of regeneration methods can remove the impurity elements such as sodium and potassium on the surface of catalyst to varying degrees. After regeneration, the denitrification efficiency of the catalyst was obviously improved at different molar ratio of ammonia to nitrogen, among which the ammonium sulfate solution cleaning method was the most ideal for the regeneration of the catalyst.
【作者单位】：中国科学院城市环境研究所;中国科学院大学;
【分类号】：X773

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