Engineering practice and economic analysis of ozone oxidation wet denitrification technology

doi:10.1016/j.cjche.2020.08.042

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 Li^1,2, Defu Che², Chenglong Yang¹, Mingyu Yao¹, Tingwen Zhao¹, Kangli Fu¹, Hanchen Zhao¹

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 Li^1,2, Defu Che², Chenglong Yang¹, Mingyu Yao¹, Tingwen Zhao¹, Kangli Fu¹, Hanchen Zhao¹

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/Abstract

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 NO_x is also established, and the absorption characteristics of NO_x are studied. The characteristics of NO oxidation and NO_x 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%). NO_x removal efficiency can be improved by oxidizing NO_x to N₂O₅ or NO₃ by increasing ozone ratio. When the molar ratio of O₃/NO is 1.77, the NO_x removal efficiency reaches 90.3%, while the operating cost of removing NO_x 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 NO_x is also established, and the absorption characteristics of NO_x are studied. The characteristics of NO oxidation and NO_x 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%). NO_x removal efficiency can be improved by oxidizing NO_x to N₂O₅ or NO₃ by increasing ozone ratio. When the molar ratio of O₃/NO is 1.77, the NO_x removal efficiency reaches 90.3%, while the operating cost of removing NO_x per kilogram is 6.06 USD (NO₂).

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

Yang Li, Defu Che, Chenglong Yang, Mingyu Yao, Tingwen Zhao, Kangli Fu, Hanchen Zhao. Engineering practice and economic analysis of ozone oxidation wet denitrification technology[J]. 中国化学工程学报, 2021, 29(1): 401-408.

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Engineering practice and economic analysis of ozone oxidation wet denitrification technology

Engineering practice and economic analysis of ozone oxidation wet denitrification technology

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