燃煤烟气中零价汞的催化氧化理论研究进展

doi:10.11930/j.issn.1004-9649.201611113

中国电力 ›› 2018, Vol. 51 ›› Issue (3): 170-176.DOI: 10.11930/j.issn.1004-9649.201611113

燃煤烟气中零价汞的催化氧化理论研究进展

赵莉¹, 刘宇¹, 吴洋文¹, 庄柯², 陆强¹

1. 生物质发电成套设备国家工程实验室(华北电力大学)北京 102206;
2. 国电环境保护研究院, 江苏南京 210031

收稿日期:2016-12-06 修回日期:2017-07-18 出版日期:2018-03-05 发布日期:2018-03-12
通讯作者: 陆强(1982—),男,江苏江阴人,教授,从事固体燃料热化学转化与烟气污染物控制技术研究,E-mail:qianglu@mail.ustc.edu.cn。
作者简介:赵莉(1969—),女,河北保定人,副教授,从事燃煤污染物控制技术研究,E-mail: zhaoli9533@163.com;刘宇(1994—),男,内蒙古巴彦淖尔人,硕士研究生,从事燃煤污染物控制基础研究,E-mail: ly_nelb@foxmail.com;陆强(1982—),男,江苏江阴人,教授,从事固体燃料热化学转化与烟气污染物控制技术研究,E-mail:qianglu@mail.ustc.edu.cn。

Review on Theoretical Research of the Catalytic Oxidation of Hg⁰ in Coal-Fired Flue Gas

ZHAO Li¹, LIU Yu¹, WU Yangwen¹, ZHUANG Ke², LU Qiang¹

1. National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China;
2. State Power Environmental Protection Research Institute, Nanjing 210031, China

Received:2016-12-06 Revised:2017-07-18 Online:2018-03-05 Published:2018-03-12

摘要/Abstract

摘要： 汞是燃煤锅炉烟气重金属污染元素之一，主要存在形态为零价汞(Hg⁰)、氧化态汞(Hg²⁺)和颗粒态汞(Hg_p)，其中Hg⁰难以去除，通常需将其氧化为较易脱除的Hg²⁺后再脱除；催化剂可以促进Hg⁰的氧化，按照催化剂来源与功能的不同，将其分为3类，即燃煤飞灰、常规Hg⁰氧化催化剂及联合脱硝脱汞催化剂，综述了Hg⁰在不同催化剂作用下发生氧化反应的密度泛函理论(DFT)研究现状；对各种催化剂表面Hg⁰的吸附以及氧化反应机理进行了总结并比较了一些相近研究的内容与结果；指出了现有研究的不足，提出了Hg⁰氧化剂DFT理论计算研究今后的发展趋势。

关键词: 燃煤电站, 汞排放, 汞脱除, 零价汞, 汞催化氧化, 密度泛函理论

Abstract: Mercury is one of the heavy metal element pollution in the flue gas of coal-fired power generation, with elemental mercury (Hg⁰), oxidized mercury (Hg²⁺) and particulate mercury (Hg^P) as its main existing forms. Since Hg⁰ is difficult to be removed, it is usually oxidized to Hg²⁺, which can be removed easily with the help of catalysts. Hg⁰ oxidation catalyst can be divided into three major types according to their different sources and functions, i.e., coal-fired fly ash, conventional Hg⁰ oxidation catalyst, and cooperative de-NO_X and Hg-removal catalyst. In this paper, the present status of the density functional theory (DFT) study of oxidation reaction of Hg⁰ under different catalysts is reviewed. Then the mechanisms of adsorption and oxidation reaction of Hg⁰ on various catalysts are summarized and the contents and results of some similar studies are compared. In addition, the deficiency of the current research is pointed out and the future development trend of DFT calculation study of Hg⁰ oxidation catalyst is put forward.

Key words: Coal-fired plant, Hg emission, Hg removal, Hg⁰, catalytic oxidation of Hg, Density Functional Theory

中图分类号:

TK621
X501

赵莉, 刘宇, 吴洋文, 庄柯, 陆强. 燃煤烟气中零价汞的催化氧化理论研究进展[J]. 中国电力, 2018, 51(3): 170-176.

ZHAO Li, LIU Yu, WU Yangwen, ZHUANG Ke, LU Qiang. Review on Theoretical Research of the Catalytic Oxidation of Hg⁰ in Coal-Fired Flue Gas[J]. Electric Power, 2018, 51(3): 170-176.

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https://www.electricpower.com.cn/CN/Y2018/V51/I3/170

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燃煤烟气中零价汞的催化氧化理论研究进展

Review on Theoretical Research of the Catalytic Oxidation of Hg⁰ in Coal-Fired Flue Gas

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Review on Theoretical Research of the Catalytic Oxidation of Hg⁰ in Coal-Fired Flue Gas