Institute of Environmental Engineering, Department of Physics, Dalian Maritime University, Dalian, China.
Environ Sci Technol. 2012 Sep 18;46(18):10161-8. doi: 10.1021/es3013886. Epub 2012 Aug 28.
In the present study, simultaneous flue gas desulfurization and denitrification are achieved with ·OH radicals generated from O(2)(+) reacting with water vapor in a duct. The O(2)(+) ions are generated by a strong ionization dielectric barrier discharge and then injected into the duct. Compared with conventional gas discharge treatment, the present method does not need a plasma reaction reactor, additional catalysts, reductants, or oxidants. The main recovered products are the liquids H(2)SO(4) and HNO(3), which can be used in many processes. Removal rates of 97% for NO and 82% for SO(2) are obtained under the following optimal experimental conditions: molar ratio of reactive oxygen species (O(2)(+), O(3)) to SO(2) and NO, 5; inlet flue gas temperature, 65 °C; reaction time, 0.94 s; and H(2)O volume fraction, 8%. Production of O(2)(+) and the plasma reaction mechanisms are discussed, and the recovered acid is characterized. The experimental results show that the present method performs better for denitrification than for desulfurization. Compared with conventional air discharge flue gas treatments, the present method has lower initial investment and operating costs, and the equipment is more compact.
在本研究中，通过在管道中 O(2)(+)与水蒸气反应生成的·OH 自由基同时实现烟气脱硫脱硝。O(2)(+)离子通过强电离介电阻挡放电产生，然后注入管道。与传统的气体放电处理相比，本方法不需要等离子体反应反应器、额外的催化剂、还原剂或氧化剂。主要回收产物是可用于许多工艺的液体 H(2)SO(4)和 HNO(3)。在以下最佳实验条件下，NO 的去除率为 97%，SO(2)的去除率为 82%：活性氧物种（O(2)(+)、O(3)）与 SO(2)和 NO 的摩尔比为 5；入口烟气温度为 65°C；反应时间为 0.94 s；H(2)O 体积分数为 8%。讨论了 O(2)(+)的产生和等离子体反应机制，并对回收的酸进行了表征。实验结果表明，本方法的脱硝性能优于脱硫性能。与传统的空气放电烟气处理相比，本方法具有较低的初始投资和运行成本，设备更紧凑。
