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Hazardous gas treatment using atmospheric pressure microwave discharges

机译：使用大气压微波放电处理有害气体

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摘要

Atmospheric pressure microwave discharge methods and devices used for producing non-thermal plasmas for control of gaseous pollutants are described in this paper. The main part of the paper is concerned with microwave torch discharges (MTDs). Results of laboratory experiments on plasma abatement of several volatile organic compounds (VOCs) in their mixtures with either synthetic air or nitrogen in low (similar to 100 W) and moderate (200-400 W) microwave torch plasmas at atmospheric pressure are presented. Three types of MTD generators, i.e. low-power coaxial-line-based MTDs, moderate-power waveguide-based coaxial-line MTDs and moderate-power waveguide-based MTDs were used. The gas flow rate and microwave (2.45 GHz) power delivered to the discharge were in the range of 1-3 litre min(-1) and 100-400 W, respectively. The concentrations of the processed gaseous pollutants were from several to several tens of per cent. The results showed that the MTD plasmas fully decomposed the VOCs at a relatively low energy cost. The energy efficiency of decomposition of several gaseous pollutants reached 1000 g (kW-h)(-1). This suggests that MTD plasmas can be useful tools for decomposition of highly concentrated VOCs.
机译：本文介绍了用于产生非热等离子体以控制气态污染物的大气压微波放电方法和装置。本文的主要部分与微波炬放电（MTD）有关。给出了在大气压力低（类似于100 W）和中等（200-400 W）的微波炬炬等离子体中用合成空气或氮气对几种挥发性有机化合物（VOC）进行等离子体消除的实验室实验结果。使用了三种类型的MTD生成器，即低功率基于同轴线的MTD，中功率基于波导的同轴线MTD和中功率基于波导的MTD。传送到放电的气体流速和微波（2.45 GHz）功率分别在1-3升min（-1）和100-400 W的范围内。加工后的气态污染物的浓度为百分之几到百分之几十。结果表明，MTD等离子体以相对较低的能源成本完全分解了VOC。几种气态污染物分解的能量效率达到1000 g（kW-h）（-1）。这表明MTD等离子体可以用作分解高浓度VOC的有用工具。

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