Removal of Elemental Mercury from Coal Combustion Flue Gas Using Catalyzed Oxidation Method

doi:10.11930/j.issn.1004-9649.201910092

Abstract

Abstract: A liquid phase catalyzed oxidation system by Copper(III) periodate complex and Ni(II) was presented in this paper to oxide the insoluble gaseous Hg⁰ to soluble Hg²⁺ which could be removed easily by air pollution control devices (APCDs), such as wet flue gas desulfurization (WFDG). The key factors on removal efficiency of Hg⁰ were experimentally investigated and the results showed that the addition of Ni(II) could greatly improved the removal efficiency of Hg⁰. The average removal efficiency of Hg⁰ by parallel experiments was steadily at 93.3%, under the optimum conditions (DPC=0.18 mmol/L, Ni(II)=4×10^-5 mmol/L, T=45℃, pH=8.5). SO₂ in the flue gas had significant influence on Hg⁰ removal, especially under high concentration conditions, while NO in the flue gas only exhibited slight effects. Moreover, the active components in the reaction system and reaction mechanism were speculated from the analysis of oxidation product. The study proposed in this paper can provide valuable reference for further investigation in the development of new Hg⁰ removal techniques from coal combustion flue gas, especially in liquid phase catalyzed oxidation process.

Key words: transition metals in highest oxidation state, coal combustion flue gas, elemental mercury, liquid phase, catalytic oxidation

QI Meng, ZHAO Yi. Removal of Elemental Mercury from Coal Combustion Flue Gas Using Catalyzed Oxidation Method[J]. Electric Power, 2020, 53(3): 147-153,166.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201910092

https://www.electricpower.com.cn/EN/Y2020/V53/I3/147

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