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

常压非热等离子工艺大气环保技术的开发

基本信息

批准号：
16206026
负责人：
ODA Tetsuji
金额：
$ 31.87万
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 (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

The aim of this project is the development of high pressure non-thermal plasma process to decompose gaseous environmental toxic contaminants and is scheduled for four years research. The target is establishment of non-thermal plasma process to decompose volatile organic compounds (VOCs) and realization of the diagnosis technology for the non-thermal plasma process, especially the researches concentrate to develop various optical technology, such as laser-induced fluorescence (LIF) technology for OH, O, NO, N_2*. For VOCs decomposition, 100-1,000 ppm trichloroethylene in air; is investigated as the decomposing target. To improve the decomposition energy efficiency, various kinds of catalysts are combined to the plasma process. It was f u d that the manganese-dioxide works very well to decompose the ozone which is the main byproducts for the plasma process of the air. Especially manganese-dioxide supported alumna, spheres decomposes the ozone very well and decomposes TCE very well. Only for decomposing the VOCs, specific energy density (SED) of 10 J/L can decompose TCS more than 90 %but the carbon balance to carbon oxide is very bad. It is found that SED of more than 90 J/L is required to realize the carbon balance to carbon oxide of 90 %. Two dimensional trace of the OH radical profile after the pulse discharge is recorded by using LIPF (laser-induced predissociation fluorescence) where most OH is produced in the streamer. A life time of OH is about 100 microseconds. Atomic oxygen radical is also observed by TALIF (two-photon assisted LIF) results are in good agreement with the ozone profile indicating the ozone generation by the 0 radical effect Recently, streamer motion and N2 radical is also observed by LIE Optical emission spectroscopy and Schlieren photos are also experimentally observed Still there are so many miscellaneous matters and improvement of the energy efficiency are also next good target.

该项目的目的是开发高压非热等离子体工艺来分解气态环境有毒污染物，计划进行四年的研究。目标是建立低温等离子体分解挥发性有机物（VOCs）的过程，实现低温等离子体过程的诊断技术，特别是发展各种光学技术，如对OH、O、NO、N_2 ~* 的激光诱导荧光（LIF）技术。对于VOC分解，研究了空气中100- 1，000 ppm三氯乙烯作为分解目标。为了提高分解能量效率，将各种催化剂组合到等离子体过程中。结果表明，二氧化锰能很好地分解空气等离子体过程的主要副产物臭氧。特别是二氧化锰负载氧化铝球对臭氧和三氯乙烯的分解效果都很好。仅对VOCs而言，10 J/L的比能量密度（SED）可以使TCS分解90%以上，但对CO的碳平衡很差。结果表明，要实现90%的碳平衡，需要90 J/L以上的SED。利用激光诱导预解离荧光（LIPF）记录了脉冲放电后OH自由基分布的二维轨迹，其中大部分OH产生于流光中。OH的寿命约为100微秒。原子氧自由基也被TALIF（双光子辅助LIF）观察到，结果与臭氧轮廓吻合良好，表明臭氧产生的0自由基效应最近，流光运动和N2自由基也被观察到的LIE光学发射光谱和纹影照片也被实验观察到，仍然有这么多的杂项问题和提高能源效率也是下一个很好的目标。