Development of Gaseous Pollutants Removal Processes by Using Atmospheric Pressure Non-Thermal Plasma

作为三年项目的最后一年，取得了以下新成果。对于燃烧烟气的处理，在反应器中填充沸石(Na-ZSM5)颗粒的低温等离子体在不放电的情况下脱氮率可达60%以上，等离子体放电时脱氮率接近100%。然而，沸石的吸附作用占主导地位，单纯的复合作用尚不清楚。对于1000ppm，空气中的三氯乙烯(TCE)也被处理为VOCs分解试验。螺杆式反应器是最好的，均匀的等离子体产生是提高能量效率的关键因素。就等离子体激励高压的频率依赖性而言，商用60赫兹优于高频驱动。但对于臭氧的产生，500赫兹的驱动在某些时候比50赫兹的效率更高。发现氧化钒是提高三氯乙烯分解能量效率的有效材料。用可调谐准分子激光(KRF)观察了OH等自由基的激光诱导荧光(LIF)。在世界上首次观测到了二维和时间分辨的OH自由基分布。OH自由基信号在脉冲30微秒处出现峰值，说明低温等离子体空气净化技术是一种非常有效的空气净化技术，值得进一步开发应用。

As a final year of 3-years project, following new results are obtained. For flue gas processing from cumbustion, DeNOx performance of the non-thermal plasma where a reactor was filled with zeorite (Na-ZSM5) particulates is more than 60% without discharge and removal rate of NOx becomes roughly 100 % with plasma discharge. However, absorption effect of zeorite was dominats and pure combined effects was not yet clear. For 1,000 ppm trichloroethylene (TCE) in air was also processed as VOCs decomposition tests. A bolt type reactor was the best and uniform plasma generation was fould to the essential factor to improve energy efficiency. Concerning to the frequency dependence of the plasma exciting high voltage, commercila 60 Hz was the best compared with higher frequency drive. But for ozone generation, 500 Hz drive was more efficient than 50 Hz at some times. Vanajium oxide was found to the effective materials to improve energy efficienecy for TCE decomposition. A tunable excimer laser (KrF) was applied to observe laser-induced fluorescence (LIF) from OH radical and others. Two dimentional and time-resolved OH radical distributions were observed for the first time in the world. OH radical signal shows its peak at 30 microseconds lalter than pulse.It was concluded that Non-Thermal Plasma Processing for Air Cleaning is very effective and futher development will be done for practical usage.