采用NO₂气体和MnO₂固体进行气液两相强化吸收脱硝实验。NO₂混入模拟烟道气中，提高氧化度，强化NO溶入吸收液中；MnO₂混入稀硝酸中，将吸收产物及时氧化成硝酸锰。在填料塔内进行脱硝实验，主要考察MnO₂浓度、NO_x氧化度、反应温度、吸收液初始pH、液气比、Mn（NO₃）₂浓度对脱硝效率的影响。结果表明，优化各工艺参数，NO_x的脱除效率可达82.68%；吸收液主要成分为Mn（NO₃）₂，不断累积后对脱硝率没有影响，浓缩热分解可得到NO₂和MnO₂。

The gas-liquid two-phase enhanced denitrification experiments are carried out in a packed tower by using gaseous NO₂ and solid MnO₂.NO₂ is mixed into the simulated flue gas to enhance the degree of oxidation and strengthen the dissolution of NO gas into absorption solution.MnO₂ is mixed into the dilute nitric acid to oxidize on time the absorbed products into manganese nitrate.The effects of MnO₂ concentration,oxidation degree of NOx,reaction temperature,initial pH value of the absorption solution,ratio of liquid to gas and Mn(NO₃)₂ concentration on the denitrification efficiency are investigated.The results show that under the optimized process parameters,the removal efficiency of NOx can reach 82.68% and the main component of the absorption solution is Mn(NO₃)₂.The accumulation of Mn(NO₃)₂ has no effect on the denitrification efficiency.The NO₂ and MnO₂ can be obtained through the concentration and thermal decomposition of Mn(NO₃)₂,and both can be reused in denitrification of flue gas.

韩香莲(1982-),女,博士生,研究方向为清洁化学工艺,angelhanxiang@163.com