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Fundamental Studies on LID Concentration and Discharge Decomposition of Nitrogen-Dioxide

二氧化氮LID浓度与排放分解的基础研究

基本信息

批准号：
04452159
负责人：
SAKAI Yosuke
金额：
$ 3.39万
依托单位：
Faculty of Engineering, Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452159/
关键词：
Nitrogen-dioxide Decomposition by discharge lonization coefficient LID Glow discharge Electron attachment coefficient Decomposition by UV コロナ放電

项目摘要

The ovjective of this work is to investigate a possibility of concentrating a very small amount of nitrogen-dioxide molecules in a flue gas and decomposing them by discharge and ultra-violet light. Light-induced-Drift(LID) technique is used for the comcentration. In this project the decomposition experiment and LID concentration experiment go side by side. The main results are as follows.1)NO_2 molecules of 80%-90% were decomposed into N_2 and O_2 molecules in a NO_2 glow discharge with pressures between 1 and 7 Torr. It was shown that decomposed species, N_2 and O_<2'> were generated through NO.2)In order to know the effect of ultre-violet light generated in the discharge on the NO_2 decomposition and a possibility of NO_2 decomposition by ultra-violent light, a trial of irradiation of UV light to NO_2 has been carried out. NO_2 was shown to be decomposed into N_2 and O_<2'> however the decomposing porcess was suggested to be different from the discharge process.3) Values of the electron impace ionization coefficient and secondary coefficient for NO_2 gas are a few tens of percentage smaller than those for air, while the electron attachment coefficient for NO_2 is larger than that for O_2.4)Using the results mentioned in 3) and the electron collision cross sections of N_2O which have been reported, the cross sections of NO_2 were estimated by Boltzman equation analysis method. These data play a very important role in analyzing the NO_2 decomposition process in discharges.5)LID experiment system is now constructed, with a dye laser and a laser diode, and an improved type of drift tube. An experiment starts in SF_6 and He buffer gases.The results mentioned above have been obtained, however investigation of NO_2 decomposition by UV light and its mechanism, detailed anallysis of scientific problem of LID concentration, development of NO_2 removal technology in a flue gas are not still finised. Further investifgation have to be carried on.

这项工作的目的是研究一种可能性，即在烟道气中浓缩极少量的二氧化氮分子，并通过放电和紫外光分解它们。采用光致漂移(LID)技术进行浓缩。在本项目中，分解实验和LID浓缩实验是并行进行的。主要研究结果如下：1)在1~7Torr的NO2辉光放电中，80%~90%的NO2分子被分解成N_2和O_2分子。为了了解放电过程中产生的紫外光对NO_2分解的影响以及紫外光分解NO_2的可能性，进行了紫外光照射NO_2的实验研究。3)NO_2气体的电子碰撞电离系数和二次系数比空气的电子碰撞电离系数和二次系数小几十个百分点，而NO_2的电子附着系数比O_2的电子附着系数大。这些数据对分析放电过程中NO_2的分解过程起到了非常重要的作用。5)搭建了LID实验系统，采用染料激光器和激光二极管，并改进了漂移管。在SF_6和He缓冲气体中进行的实验已经取得了上述结果，但紫外光分解NO_2的研究及其机理、LID浓度科学问题的详细分析、烟气中NO_2脱除技术的开发仍未完成。必须进行进一步的调查。