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

doi:10.1016/j.cjche.2023.11.025

Abstract

Abstract: During wet complexation denitrification of flue gas, Fe^IIEDTA regeneration, also known as reducing Fe^IIIEDTA and Fe^IIEDTA-nitric oxide (NO) to Fe^IIEDTA, is crucial. In this paper, ultraviolet (UV) light was used for the first time to reduce Fe^IIEDTA-NO. The experimental result demonstrated that Fe^IIEDTA-NO reduction rate increased with UV power increasing, elevated temperature, and initial Fe^IIEDTA-NO concentration decreasing. Fe^IIEDTA-NO reduction rate increased first and then decreased as pH value increased (2.0-10.0). Fe^IIEDTA-NO reduction with UV irradiation presented a first order reaction with respect to Fe^IIEDTA-NO. Compared with other Fe^IIEDTA regeneration methods, Fe^IIEDTA regeneration with UV show more superiority through comprehensive consideration of regeneration rate and procedure. Subsequently, NO absorption experiment by Fe^IIEDTA solution with UV irradiation confirmed that UV can significantly promote the NO removal performance of Fe^IIEDTA. 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 Fe^IIEDTA absorption liquid with UV irradiation. UV strengthens NO removal in Fe^IIEDTA absorption liquid by forming a synergistic effect of oxidation-reduction-complexation. Finally, compared with NO removal methods with Fe^IIEDTA, Fe^IIEDTA combined UV system shows prominent technology advantage in terms of economy and secondary pollution.

Key words: Fe^IIEDTA, Ultraviolet, Flue gas, Nitric oxide, Regeneration, Absorption

摘要： During wet complexation denitrification of flue gas, Fe^IIEDTA regeneration, also known as reducing Fe^IIIEDTA and Fe^IIEDTA-nitric oxide (NO) to Fe^IIEDTA, is crucial. In this paper, ultraviolet (UV) light was used for the first time to reduce Fe^IIEDTA-NO. The experimental result demonstrated that Fe^IIEDTA-NO reduction rate increased with UV power increasing, elevated temperature, and initial Fe^IIEDTA-NO concentration decreasing. Fe^IIEDTA-NO reduction rate increased first and then decreased as pH value increased (2.0-10.0). Fe^IIEDTA-NO reduction with UV irradiation presented a first order reaction with respect to Fe^IIEDTA-NO. Compared with other Fe^IIEDTA regeneration methods, Fe^IIEDTA regeneration with UV show more superiority through comprehensive consideration of regeneration rate and procedure. Subsequently, NO absorption experiment by Fe^IIEDTA solution with UV irradiation confirmed that UV can significantly promote the NO removal performance of Fe^IIEDTA. 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 Fe^IIEDTA absorption liquid with UV irradiation. UV strengthens NO removal in Fe^IIEDTA absorption liquid by forming a synergistic effect of oxidation-reduction-complexation. Finally, compared with NO removal methods with Fe^IIEDTA, Fe^IIEDTA combined UV system shows prominent technology advantage in terms of economy and secondary pollution.

关键词: Fe^IIEDTA, Ultraviolet, Flue gas, Nitric oxide, Regeneration, Absorption

Yuan Xu, Ziwei Liu, Ying Dai, Jinbo Ouyang, Zhuyao Li, Yuling Zhu, Jianhua Ding, Feiqiang He. Nitric oxide removal from flue gas coupled with the Fe^IIEDTA regeneration by ultraviolet irradiation[J]. Chinese Journal of Chemical Engineering, 2024, 68(4): 133-143.

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Nitric oxide removal from flue gas coupled with the Fe^IIEDTA regeneration by ultraviolet irradiation

Nitric oxide removal from flue gas coupled with the Fe^IIEDTA regeneration by ultraviolet irradiation

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