SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 29 ›› Issue (1): 401-408.DOI: 10.1016/j.cjche.2020.08.042

• Resources and Environmental Technology • 上一篇    下一篇

Engineering practice and economic analysis of ozone oxidation wet denitrification technology

Yang Li1,2, Defu Che2, Chenglong Yang1, Mingyu Yao1, Tingwen Zhao1, Kangli Fu1, Hanchen Zhao1   

  1. 1 Xi'an Thermal Power Research Institute Co, Ltd, Xi'an 710032, China;
    2 State Key Laboratory of Multiphase Flow for Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2020-04-14 修回日期:2020-08-19 出版日期:2021-01-28 发布日期:2021-04-02
  • 通讯作者: Defu Che
  • 基金资助:
    The authors would like to thank Huaneng Group Science and Technology Project (HNKJ17-H14) and the Project of National Science and Technology Supporting Plan (2014BAA07B00) for their financial support.

Engineering practice and economic analysis of ozone oxidation wet denitrification technology

Yang Li1,2, Defu Che2, Chenglong Yang1, Mingyu Yao1, Tingwen Zhao1, Kangli Fu1, Hanchen Zhao1   

  1. 1 Xi'an Thermal Power Research Institute Co, Ltd, Xi'an 710032, China;
    2 State Key Laboratory of Multiphase Flow for Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2020-04-14 Revised:2020-08-19 Online:2021-01-28 Published:2021-04-02
  • Contact: Defu Che
  • Supported by:
    The authors would like to thank Huaneng Group Science and Technology Project (HNKJ17-H14) and the Project of National Science and Technology Supporting Plan (2014BAA07B00) for their financial support.

摘要: SO2 and NO emitted from coal-fired power plants have caused serious air pollution in China. In this study, a test system for NO oxidation using O3 is established. The basic characteristics of NO oxidation and products forms are studied. A separate test system for the combined removal of SO2 and NOx is also established, and the absorption characteristics of NOx are studied. The characteristics of NO oxidation and NOx absorption were verified in a 35 t·h-1 industrial boiler wet combined desulfurization and denitrification project. The operating economy of ozone oxidation wet denitrification technology is analyzed. The results show that O3 has a high rate and strong selectivity for NO oxidation. When O3 is insufficient, the primary oxidation product is NO2. When O3 is present in excess, NO2 continues to get oxidized to N2O5 or NO3. The removal efficiency of NO2 in alkaline absorption system is low (only about 15%). NOx removal efficiency can be improved by oxidizing NOx to N2O5 or NO3 by increasing ozone ratio. When the molar ratio of O3/NO is 1.77, the NOx removal efficiency reaches 90.3%, while the operating cost of removing NOx per kilogram is 6.06 USD (NO2).

关键词: Ozone, Denitrification, Wet process, Engineering practice

Abstract: SO2 and NO emitted from coal-fired power plants have caused serious air pollution in China. In this study, a test system for NO oxidation using O3 is established. The basic characteristics of NO oxidation and products forms are studied. A separate test system for the combined removal of SO2 and NOx is also established, and the absorption characteristics of NOx are studied. The characteristics of NO oxidation and NOx absorption were verified in a 35 t·h-1 industrial boiler wet combined desulfurization and denitrification project. The operating economy of ozone oxidation wet denitrification technology is analyzed. The results show that O3 has a high rate and strong selectivity for NO oxidation. When O3 is insufficient, the primary oxidation product is NO2. When O3 is present in excess, NO2 continues to get oxidized to N2O5 or NO3. The removal efficiency of NO2 in alkaline absorption system is low (only about 15%). NOx removal efficiency can be improved by oxidizing NOx to N2O5 or NO3 by increasing ozone ratio. When the molar ratio of O3/NO is 1.77, the NOx removal efficiency reaches 90.3%, while the operating cost of removing NOx per kilogram is 6.06 USD (NO2).

Key words: Ozone, Denitrification, Wet process, Engineering practice