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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 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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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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采用超声波雾化除尘技术,研制了最大处理风量为300 m3·h-1的超声波增湿撞击流泡沫捕捉塔含铍废气处理样机,按照国家标准方法对超声波增湿撞击流泡沫塔的进、出气口进行采样,使用电感耦合等离子谱仪对其除铍性能的影响因素进行了研究。结果表明,雾化加湿量的增加有利于除铍效率的提高,但同时也使净化后气体的绝对湿度增加;超声波加湿器安装在距离塔体3 m以上方能最大限度地提高除铍效率;当颗粒物粒径在0.4μm以上时,除铍效率较高,而在0.4μm以上时,除铍效率显著降低;除铍效率随进气口初始铍浓度而增加;气体流速的增加有利于提高除铍效率,但气体流速过高将导致净化后气体绝对湿度显著增加,最佳气体流速为12 m·s~(-1)。当气体流速为12 m·s~(-1)时,最佳塔内水位为40 cm。研究结果为超声波增湿撞击流泡沫捕捉塔在钍基熔盐堆(Thorium Molten Salt Reactor,TMSR)核能系统项目含铍废气上的应用提供了实验依据。 相似文献
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