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等离子体技术在环境保护中的应用(上) 总被引:17,自引:0,他引:17
介绍了等离子体的有关概念及其降解污染的基本原理,并分别阐述了高温等离子体和低温等离子体技术在环境污染治理中的应用研究,提出了今后的发展方向。 相似文献
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This paper discusses the removal of nitric oxide(NO) with low-temperature selective catalytic reduction driven by a dielectric barrier discharge with ammonia(NH_3) as a reductant. We explored the effects of NH_3, O_2, temperature and water under different applied voltage on NO removal at atmospheric pressure. The results showed that when the gas concentration ration of NH_3/NO was 0.23–0.67, the NO removal efficiency and the energy consumption was acceptable. The NO removal efficiency reached 84% under an applied voltage of 7 kV, 400 ppm NO and 90 ppm NH_3 at a temperature of 150 ℃. Water vapor had a negative effect because NO formation reactions were strengthened and NH_3 was oxidized directly rather than reduced NO molecules. The outlet gas components were observed via Fourier transform infrared spectroscopy for revealing the decomposition process and mechanism. 相似文献
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A combined plasma photolysis(CPP) reactor that utilized the dielectric barrier discharge(DBD) plasma together with DBD-driven KrI excimer ultraviolet emission was applied to the decomposition of H 2 S gas.The effects of applied voltage,input current,gas flow velocity,original concentration as well as the ratio of Kr/I 2 mixture on H 2 S removal efficiency were investigated.Gas streams containing H 2 S were separately treated with single DBD and CPP reactor under the same conditions.In comparison to DBD,CPP could greatly enhance the H 2 S removal efficiency at the same applied voltage,inlet gas concentration and gas flow velocity.In addition,the reaction mechanism was also discussed in this paper. 相似文献
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This paper investigates the degradation of chlorobenzene by dielectric barrier discharge(DBD)coupled with MnOx/γ-Al2O3 catalysts.MnOx/γ-Al2O3 catalysts were prepared using the impregnation method and were characterized in detail by N2 adsorption/desorption,x-ray diffraction and x-ray photoelectron spectroscopy.Compared with the single DBD reactor,the coupled reactor has a better performance on the removal rate of chlorobenzene,the selectivity of COx,and the inhibition of ozone production,especially at low discharge voltages.The degradation rate of chlorobenzene and selectivity of COx can reach 96.3%and 53.0%,respectively,at the specific energy density of 1350 J l-1.Moreover,the ozone concentration produced by the discharge is significantly reduced because the MnOx/Al2O3 catalysts contribute to the decomposition of ozone to form oxygen atoms for the oxidation of chlorobenzene.In addition,based on analysis of the byproducts,the decomposition mechanism of chlorobenzene in the coupled reactor is also discussed. 相似文献
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本文给出了一个S波段可调带通滤波器的全部设计过程。给出了每个实际尺寸的具体设计方法和步骤。对所做的滤波器进行了测试,实测结果和设计计算基本符合。 相似文献