CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China.
Chemosphere. 2022 Nov;307(Pt 1):135683. doi: 10.1016/j.chemosphere.2022.135683. Epub 2022 Jul 14.
Based on the ultra-low emission demand of SO and NO in flue gas, a new absorption method was proposed to improve the desulfurization and denitrification efficiency and reduce the amount of ozone by using sodium ascorbate as an additive in red mud slurry. Compared with pure red mud slurry, the red mud (RM) + sodium ascorbate (SA) slurry significantly improved the denitrification efficiency from 24% to 84% and the desulfurization efficiency to 98%. Meanwhile, the effects of RM, SA concentration, reaction time and O/NO molar ratio on desulfurization and denitrification efficiencies were studied. The results showed that the RM + SA composite slurry maintained high efficiencies of desulfurization and denitrification for 240 min under the optimized conditions. As an antioxidant, the introduction of SA inhibited the excessive oxidation of sulfite, and itself could easily react with NO through the redox reaction, greatly promoting the absorption of NO. In addition, the reaction mechanism of the simultaneous removal of SO and NO by red mud and sodium ascorbic mixed slurry combined was proposed.
基于烟道气中 SO 和 NO 的超低排放需求，提出了一种新的吸收方法，即在赤泥浆液中使用抗坏血酸钠作为添加剂，以提高脱硫和脱硝效率并减少臭氧用量。与纯赤泥浆液相比，赤泥（RM）+抗坏血酸钠（SA）浆液可将脱硝效率从 24%显著提高至 84%，脱硫效率提高至 98%。同时，研究了 RM、SA 浓度、反应时间和 O/NO 摩尔比对脱硫和脱硝效率的影响。结果表明，在优化条件下，RM+SA 复合浆液在 240min 内仍保持高效脱硫脱硝。作为一种抗氧化剂，SA 的引入抑制了亚硫酸盐的过度氧化，自身可通过氧化还原反应与 NO 轻易反应，从而大大促进了 NO 的吸收。此外，还提出了赤泥和抗坏血酸钠混合浆液同时去除 SO 和 NO 的反应机理。
