Chemical Cleaning Regeneration Technology for Deactivated SCR Catalysts

doi:10.11930/j.issn.10.11930.2015.4.6

Abstract

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

CLC Number:

TM621
X511

BAI Wei, ZHAO Dongmei，, XIAO Yuting. Chemical Cleaning Regeneration Technology for Deactivated SCR Catalysts[J]. Electric Power, 2015, 48(4): 6-10.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.4.6

https://www.electricpower.com.cn/EN/Y2015/V48/I4/6

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