Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, People's Republic of China.
Environ Technol. 2013 Sep-Oct;34(17-20):2709-16. doi: 10.1080/09593330.2013.786138.
The purpose of this investigation is to discuss the effect of gas temperature on NO(x) removal by dielectric barrier discharge. The Boltzmann equation was used to analyse the electron distribution function in the reactor, and experiments were conducted to find out the effects of different temperatures. The calculation results show that, with a rise in the temperature, E/N increases, increasing the ionization rate. When the ratio of electric field strength to total gas density (E/N) rises from 50 to 150 Td, the ionization rate and electron mean energy increase by 2.0 x 10(5) and 2.3, respectively. The experiments show that in the NO/N2 system, when the temperature increases to 1 30 degrees C and the applied voltage is 11.1 kV, the discharge power is 44.7 W, which is higher than the discharge power of 35.4 W found at 25 degrees C; in the NO/O2/N2 system, an increase in the temperature increases the decomposition of active O3 species, producing a negative effect on NO oxidation; in the NO/O2/N2/C2H4 system, when the temperature increases, the quantity of active species HO2 increases and the NO removal reaction rate increases, reflecting an obvious improvement in the NO removal; and in the NO/O2/N2/C2H4/H2O system, at 25 degrees C, 90 degrees C, and 130 degrees C, when the energy density is 239.7 J L(-1), the NO removal efficiencies are 52.8%, 66.4%, and 71.0%, respectively.
本研究旨在探讨气体温度对介质阻挡放电去除 NO(x) 的影响。采用玻尔兹曼方程分析了反应器中的电子分布函数，并进行了实验以确定不同温度的影响。计算结果表明，随着温度的升高，E/N 增加，电离率增大。当电场强度与总气体密度的比值（E/N）从 50 升高到 150 Td 时，电离率和电子平均能量分别增加了 2.0 x 10(5) 和 2.3。实验表明，在 NO/N2 体系中，当温度升高到 130°C 且施加电压为 11.1 kV 时，放电功率为 44.7 W，高于 25°C 时的 35.4 W；在 NO/O2/N2 体系中，温度升高会增加活性 O3 物种的分解，对 NO 氧化产生不利影响；在 NO/O2/N2/C2H4 体系中，随着温度的升高，活性物种 HO2 的数量增加，NO 去除反应速率增加，反映出 NO 去除的明显改善；在 NO/O2/N2/C2H4/H2O 体系中，在 25°C、90°C 和 130°C 下，当能量密度为 239.7 J L(-1) 时，NO 的去除效率分别为 52.8%、66.4%和 71.0%。
