Influence of NH3 on Hg0 Oxidation Performance of SCR Catalyst

doi:10.12096/j.2096-4528.pgt.20059

Abstract

Abstract:

As one of the main sources of mercury pollution in China, the emission control of mercury pollutants from coal-fired power plants is the requirement of China's environmental protection standards. Hg⁰ is oxidized to Hg²⁺ by means of modified SCR catalyst and halide addition in coal, and then removed by subsequent equipment, which are effective methods to improve mercury removal rate. For these methods based on air pollution control device (APCD) in China, the inhibition of high concentration NH₃ at SCR inlet is a problem to solve. Therefore, based on literature research, the influence of ammonia injection on Hg⁰ oxidation performance under the combined effect of SCR catalyst and halide addition in coal was concluded. The mechanism of improving Hg⁰ oxidation rate by modified catalyst and halide addition was analyzed. The corresponding inhibition mechanism of NH₃ on Hg⁰ oxidation was also analyzed. The research results provide a reference for the coal-fired power plants to improve Hg⁰ oxidation rate of SCR.

Key words: coal-fired power plants, Hg⁰ oxidation, SCR catalyst, halide

CLC Number:

TK09

Qiyu WENG,Duanle LI,Yuqun ZHUO. Influence of NH₃ on Hg⁰ Oxidation Performance of SCR Catalyst[J]. Power Generation Technology, 2020, 41(5): 471-479.

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Influence of NH₃ on Hg⁰ Oxidation Performance of SCR Catalyst

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