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化学进展 2017, Vol. 29 Issue (12): 1435-1445 DOI: 10.7536/PC171021 前一篇   后一篇

• 综述 •

电厂烟气汞脱除技术

张文博, 李芳芹, 吴江*, 李和兴*   

  1. 上海电力学院能源与机械工程学院 上海 200090
  • 收稿日期:2017-10-22 修回日期:2017-11-01 出版日期:2017-12-15 发布日期:2017-11-15
  • 通讯作者: 吴江,wjcfd2002@163.com;李和兴,hexing-li@shiep.edu.cn E-mail:wjcfd2002@163.com;hexing-li@shiep.edu.cn
  • 基金资助:
    国家自然科学基金项目（No.21237003，50806041）资助
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Mercury Removal Technologies of the Flue Gas from Power Plants

Wenbo Zhang, Fangqin Li, Jiang Wu*, Hexing Li*   

  1. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
  • Received:2017-10-22 Revised:2017-11-01 Online:2017-12-15 Published:2017-11-15
  • Supported by:
    The work was supported by the National Natural Science Foundation of China (No. 21237003, 50806041).
随着电厂烟气粉尘、SO2、NOx和Hg等污染物的排放控制限值越来越严格，电厂烟气的净化研究已成为最热门的研究问题之一。汞的剧毒性使得烟气汞的脱除日益引起重视，烟气脱汞技术的关键是元素汞的高效转化与脱除。在烟气脱汞技术中，活性炭喷射是较为成熟的技术，但其成本高昂；烟气飞灰对汞有一定的吸附作用，通过改性可提高其吸附性能；高级氧化，特别是光催化技术日益引起重视，钛基、铋基等光催化剂在低温条件下有良好的脱汞效率，成为烟气汞氧化减排的重要方向。成本适宜、不额外增加实施场地要求，结合现有烟气净化设备的优化运行，实现SO2、NOx、Hg等多种污染物联合脱除技术是电厂烟气汞净化的研究和工业化应用的方向，其中的科学问题是推动烟气净化技术研究发展和应用的源泉。
关键词： 燃煤电厂, 烟气脱汞, 活性炭吸附剂, 飞灰吸附剂, 光催化技术, 多污染物协同脱除
With the emission regulation for dust, SO2, NOx, Hg and other pollutants from coal-fired power plants becoming more stringent, the purification of flue gas from power plants has become a very popular area of research. The toxicity of mercury is causing widespread concern for flue gas mercury removal. The key to the study of flue gas mercury removal technology is the efficient conversion and removal of elemental mercury. Activated carbon injection is a mature technology, among the flue gas mercury removal technology, however its cost is too high. The fly ash of flue gas has a certain adsorption effect on mercury, furthermore, its adsorption performance can be improved through modification. Advanced oxidation, especially photocatalytic technology, has attracted increasing attention. Titanium-based, bismuth-based and other photocatalyst have better mercury removal efficiency under low temperature conditions, and it is becoming an important aspect of flue gas mercury oxidation and emission reduction. To realize the combined removal of SO2, NOx, Hg and other pollutants by the optimization operation of existing flue gas purification equipment, is the direction of research and industrial application of mercury purification in power plant, and the scientific problem is the source of promoting the research and application of flue gas purification technology.
Contents
1 Introduction
2 Mercury removal technologies of the flue gas from power plants
2.1 Adsorption
2.2 Photocatalytic oxidation
2.3 Low temperature plasma
2.4 Combined removal of mercury with various pollutants
3 Conclusion and outlook
Key words: coal-fired power plants, flue gas mercury removal, activated carbon adsorbent, fly ash adsorbent, photocatalytic technology, multi-pollutant combined removal

中图分类号: 

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电厂烟气汞脱除技术