商用SCR催化剂对单质汞（Hg0）的氧化作用研究

doi:10.11930/j.issn.1004-9649.201806025

中国电力 ›› 2019, Vol. 52 ›› Issue (4): 151-155,160.DOI: 10.11930/j.issn.1004-9649.201806025

商用SCR催化剂对单质汞（Hg⁰）的氧化作用研究

曲立涛^1,2, 李彩亭², 陶莉³

1. 华电电力科学研究院有限公司, 辽宁沈阳 110180;
2. 湖南大学环境科学与工程学院, 湖南长沙 410082;
3. 国网湖南省电力公司电力科学研究院, 湖南长沙 410007

收稿日期:2018-06-13 修回日期:2018-07-08 出版日期:2019-04-05 发布日期:2019-04-16
作者简介:曲立涛(1982-),男,硕士,工程师,从事火力发电厂污染物控制技术研究,E-mail:litao-qu@chder.com

Study on the Oxidation Effects of Commercial SCR Catalyst on Elemental Mercury (Hg⁰)

QU Litao^1,2, LI Caiting², TAO Li³

1. Huadian Electric Power Research Institute Co., Ltd., Shenyang 110180, China;
2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;
3. State Grid Hunan Electric Power Corporation Research Institute, Changsha 410007, China

Received:2018-06-13 Revised:2018-07-08 Online:2019-04-05 Published:2019-04-16

摘要/Abstract

摘要： 为开发对烟气NO_x和汞等多种污染物具有良好联合脱除效用的一体化新型催化剂，研究了目前商用SCR脱硝催化剂对单质汞（Hg⁰）的氧化作用及其影响因素，探求Hg⁰氧化反应机理。实验结果表明：SCR催化剂对烟气中的Hg⁰具有一定的氧化作用，但在催化剂最佳反应温度250~300 ℃时，其对Hg⁰的最大氧化效率仍低于50%。在低浓度NO和5%O₂同时存在的情况下，催化剂对Hg⁰有相对较高的氧化效率；SO₂存在时，Hg⁰的氧化明显被抑制，SO₂对催化剂的毒性基本不可逆转；NH₃与Hg⁰在吸附过程中存在竞争关系，因而NH₃的存在降低了催化剂对Hg⁰的氧化效率；H₂O对Hg⁰的氧化有十分明显的负面影响。

关键词: 燃煤电厂, 烟气脱硝, SCR催化剂, 单质汞（Hg⁰）, Hg⁰氧化效率

Abstract: In order to develop a novel integrated catalyst with better joint removal effects on various pollutants such as NO_x and mercury in the flue gas, the oxidation effects of commercial SCR denitration catalyst on elemental mercury (Hg⁰) and its influencing factors were studied in this paper. The oxidation reaction mechanism of Hg⁰ was also explored. The experimental results show that the SCR catalyst has some certain oxidation effects on Hg⁰ in flue gas. However, its maximum oxidation efficiency on Hg⁰ is still below 50% even at the optimum reaction temperature of 250~300 ℃. In the presence of low concentration of NO and 5% O₂, the catalyst has a relatively high oxidation efficiency for Hg⁰. While in the presence of SO₂, the oxidation of Hg⁰ was apparently inhibited, and the toxicity of SO₂ to the catalyst was basically irreversible. Moreover, there exists a competitive relationship between NH₃ and Hg⁰ in the adsorption process. So the presence of NH₃ reduces the oxidation efficiency of Hg⁰ by the catalyst. It also appears that the presence of H₂O has significant negative impact on the oxidation of Hg⁰.

Key words: coal-fired power plants, flue gas denitration, SCR catalyst, elemental mercury (Hg⁰), oxidation efficiency of Hg⁰

中图分类号:

X511
TM621.9

曲立涛, 李彩亭, 陶莉. 商用SCR催化剂对单质汞（Hg⁰）的氧化作用研究[J]. 中国电力, 2019, 52(4): 151-155,160.

QU Litao, LI Caiting, TAO Li. Study on the Oxidation Effects of Commercial SCR Catalyst on Elemental Mercury (Hg⁰)[J]. Electric Power, 2019, 52(4): 151-155,160.

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https://www.electricpower.com.cn/CN/Y2019/V52/I4/151

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商用SCR催化剂对单质汞（Hg⁰）的氧化作用研究

Study on the Oxidation Effects of Commercial SCR Catalyst on Elemental Mercury (Hg⁰)

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