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<p>Given the limitations of conventional technologies for NO<sub>x</sub> removal in arc-heated wind tunnels (AWT), a novel approach that combining alkaline liquid wet scrubbing with ozone oxidation was proposed in this study. This study first concentrated on examining the NO<sub>x</sub> emission characteristics under various AWT operating conditions and evaluating the factors influencing the conversion of NO to NO<sub>2</sub>. With a reaction temperature of 25 °C, a reaction time of 50&#xa0;s, O<sub>2</sub> concentration of 20%, and NO initial concentration of 20,000&#xa0;ppm, the NO<sub>x</sub> conversion efficiency (ηNO) was higher than 81%. Secondly, an experimental system was established based on the technical route, and key factors such as residence time, pH, and inlet concentration were systematically investigated to optimize the experiment parameters. The results showed that the NO<sub>x</sub> removal efficiency increased with the longer residence time, higher pH, and higher inlet NO<sub>x</sub> concentration. Based on the emission characteristics of ultra-high concentration NO<sub>x</sub> in an AWT and the experimental study of factors affecting removal efficiency, the design of an integrated removal system combining alkaline liquid wet scrubbing with ozone oxidation was developed. The significance of this study lies in the proposal and validation of an innovative NO<sub>x</sub> removal technology for ultra-high concentrations, which effectively addresses the challenges of AWT exhaust gas treatment, and provides a new solution for environmental protection and industrial applications.</p>

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Emission Characteristics and Absorption Removal of Ultra-high Concentration NOx in an Arc-Heated Wind Tunnel

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Zhiliang Xue,
  • Jie Yuan,
  • Jiaming Shao,
  • Pei Li,
  • Yonggang Zhou,
  • Tao Zhu,
  • Zhihua Wang

摘要

Given the limitations of conventional technologies for NOx removal in arc-heated wind tunnels (AWT), a novel approach that combining alkaline liquid wet scrubbing with ozone oxidation was proposed in this study. This study first concentrated on examining the NOx emission characteristics under various AWT operating conditions and evaluating the factors influencing the conversion of NO to NO2. With a reaction temperature of 25 °C, a reaction time of 50 s, O2 concentration of 20%, and NO initial concentration of 20,000 ppm, the NOx conversion efficiency (ηNO) was higher than 81%. Secondly, an experimental system was established based on the technical route, and key factors such as residence time, pH, and inlet concentration were systematically investigated to optimize the experiment parameters. The results showed that the NOx removal efficiency increased with the longer residence time, higher pH, and higher inlet NOx concentration. Based on the emission characteristics of ultra-high concentration NOx in an AWT and the experimental study of factors affecting removal efficiency, the design of an integrated removal system combining alkaline liquid wet scrubbing with ozone oxidation was developed. The significance of this study lies in the proposal and validation of an innovative NOx removal technology for ultra-high concentrations, which effectively addresses the challenges of AWT exhaust gas treatment, and provides a new solution for environmental protection and industrial applications.