中国电力 ›› 2015, Vol. 48 ›› Issue (4): 6-10.DOI: 10.11930.2015.4.6

• 火电厂烟气脱硝技术专栏 • 上一篇    下一篇

失活SCR脱硝催化剂化学清洗再生技术研究

白伟1,赵冬梅12,肖雨亭1   

  1. 1. 江苏龙源催化剂有限公司,江苏 无锡 214151;
    2. 国电集团脱硝催化剂分析测试中心,江苏 无锡 214151
  • 收稿日期:2015-01-09 出版日期:2015-04-25 发布日期:2015-12-03
  • 作者简介:白伟(1967—),男,甘肃通渭人,高级工程师,从事SCR蜂窝式脱硝催化剂生产技术研究与管理。E-mail: baiw@lychj.cn
  • 基金资助:
    This work is supported by National High Technology Research and Development Program of China (863 Program) (No.2012AA06A113).

Chemical Cleaning Regeneration Technology for Deactivated SCR Catalysts

BAI Wei1, ZHAO Dongmei12, XIAO Yuting1   

  1. 1. Jiangsu Longyuan Catalyst Co., Ltd., Wuxi 214151, China;
    2. DeNOx Catalyst Analysis and Testing Center of China Guodian Corporation, Wuxi 214151, China
  • Received:2015-01-09 Online:2015-04-25 Published:2015-12-03
  • Contact: 国家高技术研究发展计划(863计划)(2012AA06A113)

摘要: 以某燃煤电厂废弃的失活SCR脱硝催化剂为研究对象,用化学清洗方法对其进行再生,以了解化学清洗液有效成分、浓度和液固比等去除脱硝催化剂表面Fe2O3、K2O、Na2O的效果;同时,对再生前后脱硝催化剂的比表面积、孔容和脱硝活性进行了测试,并对比了二者的表面形貌特征。结果表明:硫酸、硝酸对去除催化剂表面中毒元素非常有效,其中硝酸溶液的最佳质量分数为2%;适当增大液固比有利于彻底清洗催化剂表面的中毒元素;经过化学清洗再生后,脱硝催化剂表面变得粗糙,比表面积增大至新催化剂的93.88%,脱硝活性有较大提高,为新催化剂的89%。

关键词: 烟气脱硝, 选择性催化还原, 催化剂, 化学清洗, 再生

Abstract: The regeneration of the deactivated SCR catalysts abandoned by a coal-fired power plant is conducted with the chemical cleaning technology to explore the effects of the effective components concentration of the cleaning solution, and the ratio of liquid to solid on the removal of Fe2O3, K2O and Na2O. Meanwhile, the specific surface area, pore volume and de-NOx activity of the deactivated and regenerated catalysts are also measured, and the surface morphologies of these SCR catalysts are compared. The results show that the sulfuric acid or nitric acid is very effective in removing the poisoning elements, in which the optimum mass concentration of the nitric acid solution is 2%. Increasing the liquid-to-solid ratio adequately is beneficial for completely removing the poisoning elements on the catalyst surface. After the regeneration, the catalyst surface becomes rougher, and the BET result is increased to 93.88% of the new catalyst, which proves that the de-NOx activity of the regenerated catalyst is improved substantially and can be recovered to as much as 89% of the fresh one.

Key words: flue gas denitration, selective catalytic reduction, de-NOx catalyst, chemical cleaning, regeneration

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