Effects of ethanol injection on NO_x removal performance in an ozone advanced oxidation process were investigated based on a scale-up reaction system. Experimental results showed that the introduction of ethanol in simulated flue gas could enhance NO_x removal performance greatly in the O₃–ethanol–NO_x system. With an initial NO concentration of 400 ppm in flue gas at 150 °C, the injection of 200 ppm O₃ could oxidize approximately half of NO into NO₂. When further introducing ∼150 ppm ethanol vapor in flue gas, the outlet NO concentration would drop sharply to ∼68 ppm while outlet NO₂ concentration would drop down to ∼165 ppm at the same time. This enhancement effect was ascribed to a synergistic reaction between O₃, ethanol, and NO_x in the gas phase. The gas reaction products were analyzed by using gas chromatography–mass spectrometry, and some kinds of nitro-compounds, such as nitroso methane, nitromethane, nitric acid methyl ester, and nitric acid ethyl ester, had been found. It is implied that some complex reactions might occur between ethanol and O₃ at the presence of NO_x, in which a large number of organic radicals and hydroxyl radicals had been produced. In addition, the effects of key operating parameters on NO_x removal performance were investigated through comparing the changes in the NO_x concentration between O₃–NO_x and O₃–ethanol–NO_x systems, and the related reaction mechanism had also been discussed.

中文翻译：

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使用臭氧高级氧化工艺注入低浓度乙醇从烟气中脱除NO _x的性能和机理

对NO乙醇注射的影响_X基于按比例放大反应系统上进行了调查去除性能在臭氧高级氧化工艺。实验结果表明，模拟的烟道气中的引入的乙醇可以提高NO _X在将O大大去除性能₃ -乙醇-NO _X系统。在150°C的烟气中初始NO浓度为400 ppm时，注入200 ppm O ₃可以将大约一半的NO氧化成NO ₂。当在烟气中进一步引入约150 ppm的乙醇蒸气时，出口NO浓度将急剧下降至〜68 ppm，而出口NO ₂浓度将同时降至165 ppm。这种增强作用归因于气相中O ₃，乙醇和NO _x之间的协同反应。用气相色谱-质谱法分析了气相反应产物，发现了亚硝基甲烷，硝基甲烷，硝酸甲酯，硝酸乙酯等硝基化合物。暗示在NO _x存在下乙醇和O ₃之间可能发生一些复杂的反应，其中已经生成了大量的有机自由基和羟基自由基。此外，关键操作参数对NO _x的影响通过比较O ₃ -NO _x和O _3-乙醇-NO _x系统中NO _x浓度的变化来研究其去除性能，并讨论了相关的反应机理。