Characteristics of simultaneous removal of NOx and SO2 by O3-NH3 synergy
BIAN Ruo-yu1, AN Zhone-yi2, LI Qi-chao2, ZHU Chun1, SUN Zhen-kun1, DUAN Lun-bo1
1. Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, Southeast University, Nanjing 210096, China; 2. China Metallurgical Group Corporation Huatian Nanjing Engineering Technology, Nanjing 210019, China
Abstract：A technology of O3 pre-oxidation combined with NH3 injection had been proposed to improve the performance of desulfurization and denitrification for sintering flue gas. The characteristics of the homogeneous reaction among the introduced O3 and NH3, and the NOx and SO2 from the sintering flue gas had been studied in a fixed-bed reactor. Results show that the oxidation of NO by O3 proceeds in a step-by-step manner. With the increase of the mole ratio of O3/NO in the gas mixture with only O3 and NO, O3 had firstly oxidized NO into NO2, while subsequently to N2O5. However, the oxidation of SO2 by O3 in the gas mixture with only SO2 and O3 was very limited. When O3/SO2=1in the gas mixture of O3 and NO, the oxidation efficiency of SO2 was less than 5.0%. After NH3 had been introduced into the pre-reacted gas mixture of O3 and NO, about 6.7% of O3 was consumed. In this gas mixture, when O3/NO=1, the pre-oxidation product NO2 decreased significantly from 278×10-6to 144×10-6, while the NO concentration at reactor outlet increased slightly from 16×10-6 to 35×10-6. When O3/NO=1.5, the NOx concentration at reactor outlet was equal to that without NH3 introduction. With the simultaneous introduction of O3 and NH3, the oxidation rate of SO2 increased significantly from 24.0% to 41.1%. It had been speculated that the desulfurization products was the compound of NH4HSO4 or (NH4)2SO4, which was stable in the reaction condition. During the reaction among SO2, NOx and the simultaneously introduced O3 and NH3, the reactions of NH3-NO2 and NH3-SO2 took place at the same time when the ratio of O3/NO <1. Therefore, the increasing amount of NH3 could improve both the desulfurization and denitrification efficiencies. When O3/NO >1, the reaction between NH3 and N2O5 showed the highest priority, and the consumption of NH3 by N2O5 inhibited the desulfurization reaction of between NH3 and SO2. The simultaneous introduction of O3 and NH3 had limited impact on desulfurization and denitrification efficiencies, but it had an obvious impact on changing the form of N- and S-containing pollutants in the sintering flue gas.
卞若愚, 安忠义, 李启超, 朱纯, 孙镇坤, 段伦博. O3-NH3协同活性焦脱硫脱硝的均相预反应特性研究[J]. 中国环境科学, 2021, 41(10): 4476-4483.
BIAN Ruo-yu, AN Zhone-yi, LI Qi-chao, ZHU Chun, SUN Zhen-kun, DUAN Lun-bo. Characteristics of simultaneous removal of NOx and SO2 by O3-NH3 synergy. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4476-4483.
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