Removal of nitric oxide from simulated flue gas using aqueous persulfate with activation of ferrous ethylenediaminetetraacetate in the rotating packed bed

IF 4.3 3区工程技术 Q2 ENGINEERING, CHEMICAL Frontiers of Chemical Science and Engineering Pub Date : 2023-01-13 DOI:10.1007/s11705-022-2224-5

Da Guo, Guisheng Qi, Dong Chen, Jiabao Niu, Youzhi Liu, Weizhou Jiao

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引用次数: 3

Abstract

Nitric oxide being a major gas pollutant has attracted much attention and various technologies have been developed to reduce NO emission to preserve the environment. Advanced persulfate oxidation technology is a workable and effective choice for wet flue gas denitrification due to its high efficiency and green advantages. However, NO absorption rate is limited and affected by mass transfer limitation of NO and aqueous persulfate in traditional reactors. In this study, a rotating packed bed (RPB) was employed as a gas—liquid absorption device to elevate the NO removal efficiency (η_NO) by aqueous persulfate ((NH₄)₂S₂O₈) activated by ferrous ethylenediaminetetraacetate (Fe²⁺-EDTA). The experimental results regarding the NO absorption were obtained by investigating the effect of various operating parameters on the removal efficiency of NO in RPB. Increasing the concentration of (NH₄)₂S₂O₈ and liquid—gas ratio could promoted the oxidation and absorption of NO while the η_NO decreased with the increase of the gas flow and NO concentration. In addition, improving the high gravity factor increased the η_NO and the total volumetric mass transfer coefficient (K_Gα) which raise the η_NO up to more than 75% under the investigated system. These observations proved that the RPB can enhance the gas—liquid mass transfer process in NO absorption. The correlation formula between K_Gα and the influencing factors was determined by regression calculation, which is used to guide the industrial scale-up application of the system in NO removal. The presence of O₂ also had a negative effect on the NO removal process and through electron spin resonance spectrometer detection and product analysis, it was revealed that Fe²⁺-EDTA activated (NH₄)₂S₂O₈ to produce •SO ⁻₄ , •OH and •O ⁻₂ , played a leading role in the oxidation of NO, to produce NO ⁻₃ as the final product. The obtained results demonstrated a good applicable potential of RPB/PS/Fe²⁺-EDTA in the removal of NO from flue gases.

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在旋转填料床中活化过硫酸盐水去除模拟烟气中的一氧化氮

一氧化氮作为一种主要的气体污染物引起了人们的广泛关注，人们开发了各种技术来减少一氧化氮的排放，以保护环境。过硫酸盐高级氧化技术具有高效、绿色的优点，是湿法烟气脱硝的一种可行有效的选择。然而，传统反应器中NO的吸收率受到NO和过硫酸盐传质限制的限制。本研究采用旋转填料床(RPB)作为气液吸收装置，以乙二胺四乙酸亚铁(Fe2+-EDTA)为活化剂，提高过硫酸盐(NH4)2S2O8的去除率(ηNO)。通过研究不同操作参数对RPB中NO去除率的影响，得到了NO吸附的实验结果。增加(NH4)2S2O8浓度和液气比可以促进NO的氧化和吸收，而ηNO随气体流量和NO浓度的增加而降低。此外，提高高重力系数提高了体系的ηNO和总体积传质系数(KGα)，使体系的ηNO提高了75%以上。结果表明，RPB能增强NO吸附过程中的气液传质过程。通过回归计算，确定了KGα与各影响因素之间的相关公式，用于指导该系统在脱硝过程中的工业规模化应用。通过电子自旋共振谱仪检测和产物分析，发现Fe2+-EDTA激活(NH4)2S2O8生成•SO−4、•OH和•O−2，在NO氧化过程中起主导作用，最终生成NO−3。结果表明，RPB/PS/Fe2+-EDTA在烟气中去除NO具有良好的应用潜力。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.