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INVESTIGATION ON REMOVAL PROCESS OF ENVIRONMENTAL CONTAMINANTS BY ATMOSPHERIC PRESSURE NON-THERMAL PLASMA

常压非热等离子体去除环境污染物工艺研究

基本信息

批准号：
12450108
负责人：
ODA Tetsuji
金额：
$ 9.54万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

This project was carried out from April, 200 to March 2003 supported by the "grant-in-Aid for Scientific Research (B) from JSPS. Main targets of that projet were developing NOx removal technology from the combustion flue gas and dilute VOCs removal technology from contaminated air by using atmospheric pressure nonthermal plasma. For that purpose, the removal mechanism of those contaminants by the plasma was also investigated. The barrier discharge reactor with a bolt discharge electrode at the center of that cylindrical reactor driven by a 50 Hz ac high voltage was found the best practical reactor. The plasma process combined with the catalyst worked well and improved the energy efficiency to remove VOCs from air. Newly a laser-induced-fluorescence (LIF) method was constructed for diagnosis of the pulse plasma using a tunable narrow band KrF excimer laer (248nm) which was very insensible for a quenching effect. Time evolution of two dimensional OH radical behavior was observed just after the pulse discharge. The OH radical generation and decay were strongly dependent on the discharge mode and gas conditions. The LIF method to detect NO, NO^* and O_2 were also developed. For NO detection, second harmonics of a tunable dye laser, 226nm, was also utilized. OH generation or NO decomposition by the discharge were very active in the streamer region made by the plasma. If the concentration of NO is low, some radical exists and progresses to other region to decompose other NO with time.Ozone generation and decay were also detected in two dimension by laser-absorption method where the ozone decomposition (generating O radical).was also identified.The correlation between the discharge current and generation of various kinds of radicals is also studied now resulting the development of more effective environmental techniques in near futre.

本研究项目于2000年4月至2003年3月在日本学术振兴计划（JSPS）“科学研究资助金（B）”的资助下进行。该项目的主要目标是开发利用常压低温等离子体从燃烧烟气中脱除NOx的技术和从污染空气中脱除稀VOCs的技术。为此，还研究了等离子体对这些污染物的去除机理。在圆柱形反应器的中心具有螺栓放电电极的阻挡放电反应器被发现是最好的实用反应器，该圆柱形反应器由50 Hz交流高压驱动。等离子体工艺与催化剂相结合效果良好，提高了从空气中去除VOCs的能量效率。利用KrF准分子莱尔（248 nm）的可调谐窄带特性，建立了脉冲等离子体的激光诱导荧光（LIF）诊断方法。脉冲放电后，观察到二维OH自由基行为的时间演化。OH自由基的产生和衰减强烈依赖于放电模式和气体条件。建立了检测NO、NO^* 和O_2的激光诱导荧光法。对于NO检测，还利用了可调谐染料激光器226nm的二次谐波。OH生成或NO分解的放电是非常活跃的流光区由等离子体。如果NO的浓度低，激光吸收法在二维空间探测到了臭氧的产生和衰减，（生成O自由基）放电电流与各种自由基产生之间的相关性也在研究中，从而导致更有效的环境技术的发展，近未来