Abstract Excess O3 is invariably used to ensure the effective oxidation of NO in the industrial simultaneous desulfurization and denitration through combined ozone oxidation and absorbent scrubbing. O3 is difficult to fully react with NO considering the short residence time of flue gas, remaining O3 transport into the subsequent absorption device, and even its escape into the atmosphere. To study the influence of excess O3 on NO2 absorption in sulfite solution, we simulated an integrative process of pre-oxidation and post-absorption. NO2 removal efficiency was improved from 36.1% to 66.5% as the mole ratio of O3/NO increased from 1.0 to 1.6. Additionally, the effects of temperature, pH, and reactant concentration with the remaining O3 on NO2 removal were evaluated. After 5 h of steady absorption, the concentration of total N species in the adsorbent was 82.8 mmol/L at a O3/NO mole ratio = 1.6. However, this concentration was only 51.4 mmol/L at a O3/NO mole ratio = 1.0, indicating that more NO2 was absorbed, and the gas-liquid transfer of NO2 was enhanced by the excess O3 via oxidizing NO2− into NO3−. This work contributes to re-utilizing remaining O3 and reducing O3 escape in simultaneous desulfurization and denitration technology.

中文翻译：

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使用过量的 O3 促进亚硫酸盐溶液中的 NO2 吸收：工艺条件和机理

摘要 在工业同步脱硫脱硝中，臭氧氧化和吸收剂洗涤相结合，总是使用过量的O3来保证NO的有效氧化。考虑到烟气停留时间短，剩余的O3输送到后续吸收装置中，甚至逃逸到大气中，O3难以与NO完全反应。为了研究过量 O3 对亚硫酸盐溶液中 NO2 吸收的影响，我们模拟了预氧化和后吸收的综合过程。随着 O3/NO 的摩尔比从 1.0 增加到 1.6，NO2 去除效率从 36.1% 提高到 66.5%。此外，还评估了温度、pH 值和带有剩余 O3 的反应物浓度对 NO2 去除的影响。稳定吸收 5 小时后，在 O3/NO 摩尔比 = 1.6 时，吸附剂中总 N 物质的浓度为 82.8 mmol/L。然而，在 O3/NO 摩尔比 = 1.0 时，该浓度仅为 51.4 mmol/L，表明更多的 NO2 被吸收，过量的 O3 通过将 NO2- 氧化为 NO3- 增强了 NO2 的气液传递。该工作有助于在同时脱硫脱硝技术中再利用剩余O3，减少O3逸出。