含钡SCR脱硝催化剂运行后的再生研究

doi:10.11930/j.issn.1004-9649.2016.11.175.06

摘要/Abstract

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。

关键词: 烟气脱硝, 选择性催化还原, 催化剂, 硫酸钡, 再生, 清洗

Abstract: The regeneration of deactivated commercial selective catalytic reduction(SCR) catalysts is helpful to improve the economic efficiency of power plants and protect the environment. Take the example of the deactivated SCR catalysts containing Ba from a power plant as the study object, three methods, i.e., combined sodium hydroxide and citric acid cleaning, dilute sulphuric acid cleaning and ammonium sulfate solution cleaning, are adopted to conduct the regeneration processing of the catalysts. The physicochemical properties of the catalysts before and after the regeneration are tested, then the deactivation causes and the performance recovery are analyzed by various characterization and evaluation methods. Moreover, the regeneration effects of the three methods are compared. The results show that the deposit of the impurities such as BaSO₄, K and Na detected on the surface of the used catalysts are the root cause leading to the catalytic activity deterioration. The three regeneration methods can all remove the impurities of K and Na at different levels. After the regeneration the denitration efficiency is improved substantially at different molar ratios of ammonia to nitrogen, among which, ammonium sulfate solution cleaning method produces the most desirable effect.

Key words: flue gas denitration, selective catalytic reduction (SCR), catalysts, BaSO4, regeneration, cleaning

中图分类号:

X511

余维佳, 王金秀, 陈进生, 于艳科, 苗纪法. 含钡SCR脱硝催化剂运行后的再生研究[J]. 中国电力, 2016, 49(11): 175-180.

YU Weijia, WANG Jinxiu, CHEN Jinsheng, YU Yanke, MIAO Jifa. Study on Regeneration of Used SCR Catalysts Containing Ba[J]. Electric Power, 2016, 49(11): 175-180.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.2016.11.175.06

https://www.electricpower.com.cn/CN/Y2016/V49/I11/175

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