脉冲电晕技术在处理挥发性有机化合物中的应用研究

APPLICATION STUDY ON REMOVAL OF VOCS BY IMPULSIVE CORONA DISCHARGING TECHNOLOGY

建立了利用脉冲电晕技术处理挥发性有机物的实验装置 ,选取苯作为代表物质进行实验研究 ,观察初始浓度、停留时间、注入能量、电源特性等参数对去除率的影响 ,并对反应副产物的成分进行分析测试。在输入电压为 50 V,频率为 2 0 Hz,气体体积流量为 1 62 0m L/ min,苯的初始质量浓度为 76.8mg/ m3的实验条件下 ,苯的去除率达到 61 .4%。脉冲电晕技术处理低浓度有机废气效果较好。

This paper is aimed at discussing an applied research on how to remove volatile organic compounds (VOCs) by impulsive corona discharging technology. Known as a promising new technology, the control of volatile organic compounds (VOCs) has been receiving more and more attention. Theoretically, the whole technology is built on a set of equipment for experiments, on which the experiment is conducted to study the effect of the benzene destruction. The total research emphases the effect of the removing efficiency of benzene dependent on the concentration, the time of staying in the reactor, the injected energy and the capability of the impulsive high voltage generator. The results of the experiment show that the removing efficiency of benzene decreases with the rising of inlet concentration of benzene, the prolonging of the time of staying in the reactor as well as the increase of the energy input and the spiking voltage. The defining factors of benzene-removing efficiency are the capability of the pulsed high voltage generator and the structure of the reactor. At an input voltage of 50 V, the average removing efficiency will be about 50% on average. When the other conditions of the system changed, The removing efficiencies may vary in the range of 38.3%～63.2% with the change of input voltage. For example, the removal efficiency will be equal to 61.4% with the input voltage being 50 V, the gas flow rate-1 620 mL/min.and the inlet concentration of benzene-76.8 mg/m^3. The presence of oxygen in the pulsed corona discharge process can contribute to the removing efficiency, though it isn't the decisive factor for the removal. The byproducts that are produced, analyzed and confirmed include: phenol, nitrobenzene, 1,2-benzenediol, 1,3-isobenzofurandione, 1,4-dinitrobenzene, 1,4-benzenediol, 3-nitrophenol, 4-nitrophenlo. From the above results it can be found that the chief factors that contribute to the removing efficiency may include improving the capability of the pulsed high voltage generator and the reactor structure, and ensuring high degree matching between them.