DEVELOPMENT OF ATMOSPHERE ENVIRONMENTAL PROTECTION TECHNOLOGY BY USING ATMOSPHERIC PRESSURE NON-THERMAL PLASMA PROCESS

该项目于2000年4月至2004年3月在日本科学院“科学研究补助金(A)”的支持下进行。这个项目的主要目标是发展的大气压力非热等离子体技术去除空气中的气态污染物或燃烧烟气。对于烟气净化，研究了De-NOx工艺，为了清洁空气，去除空气中100 -1,000 ppm的voc（挥发性有机化合物）是该项目的另一个目标。对反应器的几何效应、驱动电源进行了优化。螺栓式阻挡放电反应器在试验反应器中性能最好。提高能源效率,一些催化剂被检查,如氧化钛、氧化钒,钨氧化物、锰氧化物可以减少臭氧和提高分解效率的稀释TCE(三氯乙烯)。当被TCE污染的空气与等离子体处理过的洁净空气混合时，可以对TCE进行分解，称为间接分解。正常的过程，即被TCE污染的空气通过等离子体反应器，被称为直接过程。当比放电能量为30 J/L时，TCE的去除率最高可达95%以上。作为该等离子体的诊断过程，在空间和时间上建立了OH自由基、NO、NO^*、氧分子、原子氧自由基的LIF技术。发展了激光纹影法的其他光学方法来测量密度，并利用紫外光的激光束吸收法来观察臭氧的分布。在这个项目中建立的诊断技术。

This project was carried out from April 2000, to March 2004 supported by the "Grand-in-Aid for Scientific Research (A) from JSPS. Main target of this project is development of the atmospheric pressure non thermal plasma technology as the removing the gaseous contaminants in the air or in the combustion flue gas. For flue gas cleaning, De-NOx process was investigated and for clean air, removal of 100 -1,000 ppm VOCs (volatile organic compounds) in air is another aim of this project. Geometrical effect of the reactor, drive power supply were optimized. A bolt type barrier discharge reactor was the best among the tested reactors. To enhance the removal energy efficiency, some catalysts were examined, such as titanium oxide, vanadium oxide, tungsten oxide, Manganese oxide can reduce ozone and improve the decomposition efficiency of dilute TCE (trichloroethylene). When the TCE contaminated air is mixed with the plasma processed clean air, TCE can be decomposed, which was named as Indirect Process. Normal process, the TCE contaminated air passes through the plasma reactor, was, then, named as the Direct Process. At best case, TCE removal efficiency is more than 95 % where specific discharge energy was 30 J/L. As the diagnosis process of that plasma, LIF technologies for OH radical, NO, NO^*, oxygen molecule, atomic oxygen radicals were established in spatial and time divisions. Other optical methods of Laser-Schlieren Method is developed for density measurement and the ozone distribution could be observed by using laser-Beam Absorption method of UV light. Those diagnosis technologies built up during this project.