催化氧化法脱除燃煤烟气中的单质汞

doi:10.11930/j.issn.1004-9649.201910092

中国电力 ›› 2020, Vol. 53 ›› Issue (3): 147-153,166.DOI: 10.11930/j.issn.1004-9649.201910092

催化氧化法脱除燃煤烟气中的单质汞

齐萌, 赵毅

华北电力大学环境科学与工程学院, 北京 102206

收稿日期:2019-10-22 修回日期:2020-01-10 发布日期:2020-03-10
通讯作者: 赵毅(1955-),男,通信作者,博士生导师,从事大气污染物控制技术研究,E-mail:zhaoyi9515@163.com
作者简介:齐萌(1982-),女,博士研究生,从事环境科学与工程技术研究,E-mail:qiqi-mengmeng@163.com
基金资助:
国家重点研发计划资助项目（2016YFC0203701）

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

QI Meng, ZHAO Yi

College of Environment Science and Engineering, North China Electric Power University, Beijing 102206, China

Received:2019-10-22 Revised:2020-01-10 Published:2020-03-10
Supported by:
This work is supported by National Key R&D Program of China (No.2016YFC0203701)

摘要/Abstract

摘要： 提出了一种超价金属化合物二过碘酸合铜（DPC）与过渡金属离子Ni（II）共建的液相催化氧化体系，可将烟气中难溶于水的气态单质汞（Hg⁰）转化为易溶于水的氧化态汞（Hg²⁺），之后利用湿式吸收设备去除。对影响脱汞效率的关键因素进行了实验研究，结果表明，Ni（II）对脱汞效率有较大促进作用，在最佳实验条件下（DPC为0.18 mmol/L，Ni（II）为4×10^-5mmol/L，反应温度为45 ℃，溶液pH为8.5），稳定的平均脱汞效率达到93.3%。烟气中的SO^2-尤其是在高浓度下，对脱汞效率影响较大，而NO对脱汞影响微弱。此外，通过对反应产物的分析，推测了反应体系中的活性支配物种及Ni（II）存在下的反应机理。此工作可为研发新型烟煤烟气脱汞技术，尤其是液相催化氧化脱汞技术提供参考。

关键词: 超价金属, 燃煤烟气, 单质汞, 液相, 催化氧化

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

齐萌, 赵毅. 催化氧化法脱除燃煤烟气中的单质汞[J]. 中国电力, 2020, 53(3): 147-153,166.

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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催化氧化法脱除燃煤烟气中的单质汞

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

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