SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 68 ›› Issue (4): 133-143.DOI: 10.1016/j.cjche.2023.11.025

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Nitric oxide removal from flue gas coupled with the FeIIEDTA regeneration by ultraviolet irradiation

Yuan Xu, Ziwei Liu, Ying Dai, Jinbo Ouyang, Zhuyao Li, Yuling Zhu, Jianhua Ding, Feiqiang He   

  1. School of Chemistry and Materials Science, East China University of Technology, Nanchang 330013, China
  • 收稿日期:2023-08-31 修回日期:2023-11-05 出版日期:2024-04-28 发布日期:2024-06-28
  • 通讯作者: Feiqiang He,E-mail address:he_feiqiang@ecit.cn
  • 基金资助:
    The project was supported by National Natural Science Foundation of China (52260012); Natural Science Foundation of Jiangxi Province (20232BAB203053, 20212ACB213001, 20232BAB203033); General Project of Jiangxi Province Key Research and Development Program (20192BBG70008); Training Plan for Academic and Technical Leaders of Major Disciplines in Jiangxi Province-youth Talent Project (20232BCJ23047).

Nitric oxide removal from flue gas coupled with the FeIIEDTA regeneration by ultraviolet irradiation

Yuan Xu, Ziwei Liu, Ying Dai, Jinbo Ouyang, Zhuyao Li, Yuling Zhu, Jianhua Ding, Feiqiang He   

  1. School of Chemistry and Materials Science, East China University of Technology, Nanchang 330013, China
  • Received:2023-08-31 Revised:2023-11-05 Online:2024-04-28 Published:2024-06-28
  • Contact: Feiqiang He,E-mail address:he_feiqiang@ecit.cn
  • Supported by:
    The project was supported by National Natural Science Foundation of China (52260012); Natural Science Foundation of Jiangxi Province (20232BAB203053, 20212ACB213001, 20232BAB203033); General Project of Jiangxi Province Key Research and Development Program (20192BBG70008); Training Plan for Academic and Technical Leaders of Major Disciplines in Jiangxi Province-youth Talent Project (20232BCJ23047).

摘要: During wet complexation denitrification of flue gas, FeIIEDTA regeneration, also known as reducing FeIIIEDTA and FeIIEDTA-nitric oxide (NO) to FeIIEDTA, is crucial. In this paper, ultraviolet (UV) light was used for the first time to reduce FeIIEDTA-NO. The experimental result demonstrated that FeIIEDTA-NO reduction rate increased with UV power increasing, elevated temperature, and initial FeIIEDTA-NO concentration decreasing. FeIIEDTA-NO reduction rate increased first and then decreased as pH value increased (2.0-10.0). FeIIEDTA-NO reduction with UV irradiation presented a first order reaction with respect to FeIIEDTA-NO. Compared with other FeIIEDTA regeneration methods, FeIIEDTA regeneration with UV show more superiority through comprehensive consideration of regeneration rate and procedure. Subsequently, NO absorption experiment by FeIIEDTA solution with UV irradiation confirmed that UV can significantly promote the NO removal performance of FeIIEDTA. Appropriate oxygen concentration (3% (vol)) and acidic environment (pH = 4) was favorable for NO removal. With UV power increasing as well as temperature decreasing, NO removal efficiency rose. In addition, the mechanism research indicates that NO from flue gas is mostly converted to NO2-, NO3-, NH4+, N2, and N2O with FeIIEDTA absorption liquid with UV irradiation. UV strengthens NO removal in FeIIEDTA absorption liquid by forming a synergistic effect of oxidation-reduction-complexation. Finally, compared with NO removal methods with FeIIEDTA, FeIIEDTA combined UV system shows prominent technology advantage in terms of economy and secondary pollution.

关键词: FeIIEDTA, Ultraviolet, Flue gas, Nitric oxide, Regeneration, Absorption

Abstract: During wet complexation denitrification of flue gas, FeIIEDTA regeneration, also known as reducing FeIIIEDTA and FeIIEDTA-nitric oxide (NO) to FeIIEDTA, is crucial. In this paper, ultraviolet (UV) light was used for the first time to reduce FeIIEDTA-NO. The experimental result demonstrated that FeIIEDTA-NO reduction rate increased with UV power increasing, elevated temperature, and initial FeIIEDTA-NO concentration decreasing. FeIIEDTA-NO reduction rate increased first and then decreased as pH value increased (2.0-10.0). FeIIEDTA-NO reduction with UV irradiation presented a first order reaction with respect to FeIIEDTA-NO. Compared with other FeIIEDTA regeneration methods, FeIIEDTA regeneration with UV show more superiority through comprehensive consideration of regeneration rate and procedure. Subsequently, NO absorption experiment by FeIIEDTA solution with UV irradiation confirmed that UV can significantly promote the NO removal performance of FeIIEDTA. Appropriate oxygen concentration (3% (vol)) and acidic environment (pH = 4) was favorable for NO removal. With UV power increasing as well as temperature decreasing, NO removal efficiency rose. In addition, the mechanism research indicates that NO from flue gas is mostly converted to NO2-, NO3-, NH4+, N2, and N2O with FeIIEDTA absorption liquid with UV irradiation. UV strengthens NO removal in FeIIEDTA absorption liquid by forming a synergistic effect of oxidation-reduction-complexation. Finally, compared with NO removal methods with FeIIEDTA, FeIIEDTA combined UV system shows prominent technology advantage in terms of economy and secondary pollution.

Key words: FeIIEDTA, Ultraviolet, Flue gas, Nitric oxide, Regeneration, Absorption