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Cooperative Research on Gaseous Air Contaminants Removal by using of Discharge Plasma Processing

放电等离子体处理去除气态空气污染物的合作研究

基本信息

批准号：
05302078
负责人：
ODA Tetsuji
金额：
$ 4.54万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

项目摘要

The main aim of this project is that fundamental research and development of practical technology of cleaning gaseous air contaminants by using Non-Thermal Plasma Processing. Contaminants studied are various volatile organic compounds (VOCs) and NOx in flue gas exhausted from fuel combustion. Typical VOCs are chlorofluoro-carbon (CFC-113 : controlled against ozone layr depletion), halogenated organic compounds (trichloroethylene, tetrachloromethane : cause of cansor or others) and normal organic materials such as alcohol, acetone. Non-Thermal Plasma is generated by various methods. They are high frequency surface discharge using an alumina ceramic reactor with stripe electrode formed on inner wall or a quartz tube with a spiral wire electrode contacted on the inner wall, barrier discharge, or ultra short pulse discharge where barrier is not essential. Combining effects of those discharge or mutual comparison were also tested now. In any case, very high decomposition rate more than 95% is available, if enough dischage energy is supplied. Final products of VOCs decomposition are found to carbondioxide and water. Various byproducts generated by the plasma were identified by using FID-GC,GC-MS and FTIR.It is found that NOx decomposition by the plasma is strongly dependent on the residual oxygen concentration. The addition of anmonia or others is necessary to enhance NOx removal. Combined method of catalysis, additioning and plasma processing was very effective in reducing NOx.

本项目的主要目的是研究和开发利用非热等离子体处理净化气态空气污染物的实用技术。研究的污染物是燃料燃烧排出的烟气中的各种挥发性有机化合物（VOCs）和氮氧化物。典型的挥发性有机化合物是氯氟烃（CFC-113：控制臭氧层消耗）、卤化有机化合物（三氯乙烯、四氯甲烷：致癌或其他原因）和正常的有机物质，如酒精、丙酮。产生非热等离子体的方法多种多样。它们是使用在内壁形成条纹电极的氧化铝陶瓷反应器或在内壁接触螺旋丝电极的石英管进行高频表面放电，屏障放电或不需要屏障的超短脉冲放电。目前还对这些放电的综合效果或相互比较进行了试验。在任何情况下，如果提供足够的排放能量，都可以达到95%以上的高分解率。挥发性有机化合物分解的最终产物是二氧化碳和水。利用FID-GC、GC-MS和FTIR对等离子体产生的各种副产物进行了鉴定。研究发现，等离子体对NOx的分解与残氧浓度密切相关。添加氨或其他物质是提高NOx去除率的必要条件。催化、添加和等离子体处理相结合的方法对NOx的还原效果非常好。