NH3对SCR催化剂Hg0催化氧化性能的影响

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

发电技术 ›› 2020, Vol. 41 ›› Issue (5): 471-479.DOI: 10.12096/j.2096-4528.pgt.20059

• 厂界环保岛与数字孪生技术 • 上一篇下一篇

NH₃对SCR催化剂Hg⁰催化氧化性能的影响

翁麒宇(),李端乐(),禚玉群*()

热科学与动力工程教育部重点实验室(清华大学能源与动力工程系), 北京市海淀区 100084

收稿日期:2020-07-31 出版日期:2020-10-30 发布日期:2020-11-02
通讯作者: 禚玉群
作者简介:翁麒宇(1995),男,博士研究生,主要研究方向为汞等重金属污染物的迁移转化和排放控制, wqy17@mails.tsinghua.edu.cn|李端乐(1988),男,博士,助理研究员,主要研究方向为燃煤污染物控制、固废利用与绿色胶凝材料, liduanle@163.com
基金资助:
国家重点研发计划项目(2016YFB0600603)

Influence of NH₃ on Hg⁰ Oxidation Performance of SCR Catalyst

Qiyu WENG(),Duanle LI(),Yuqun ZHUO*()

Key Laboratory of Thermal Science and Power Engineering of Ministry of Education(Department of Energy and Power Engineering, Tsinghua University), Haidian District, Beijing 100084, China

Received:2020-07-31 Published:2020-10-30 Online:2020-11-02
Contact: Yuqun ZHUO
Supported by:
National Key Research and Development Program of China(2016YFB0600603)

摘要/Abstract

摘要：

作为我国主要的汞污染源之一，燃煤电厂汞污染物排放控制是我国环保标准的要求。通过改性SCR催化剂和卤化物添加等方法将Hg⁰氧化为Hg²⁺，进而通过后续设备进行脱除，是提高汞脱除率的有效方法。但对我国而言，这类结合现有环保设备的联合脱除方法都面临着SCR入口高浓度NH₃的抑制作用。为此，基于文献调研，总结了NH₃对SCR催化剂Hg⁰氧化性能的影响，以及卤素存在条件下NH₃对Hg⁰氧化性能的影响，分析了改性催化剂及卤化物添加对Hg⁰氧化率的提高机理，进而对应地分析了NH₃对Hg⁰氧化的抑制机理。研究结果为实际燃煤电厂提高SCR设备Hg⁰氧化率提供了参考。

关键词: 燃煤电厂, Hg⁰氧化, SCR催化剂, 卤化物

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

中图分类号:

TK09

翁麒宇,李端乐,禚玉群. NH₃对SCR催化剂Hg⁰催化氧化性能的影响[J]. 发电技术, 2020, 41(5): 471-479.

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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NH₃对SCR催化剂Hg⁰催化氧化性能的影响

Influence of NH₃ on Hg⁰ Oxidation Performance of SCR Catalyst

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