1993 Fiscal Year Final Research Report Summary
Fundamental Studies on LID Concentration and Discharge Decomposition of Nitrogen-Dioxide
| Project/Area Number |
04452159
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電力工学
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| Research Institution | Faculty of Engineering, Hokkaido University |
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Principal Investigator |
SAKAI Yosuke Hokkaido Univ., Fac.of Eng.Professor, 工学部, 教授 (20002199)
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| Co-Investigator(Kenkyū-buntansha) |
SUGAWARA Hirotake Hokkaido Univ., Fac.of Eng.Research Associate, 工学部, 助手 (90241356)
TABATA Masayoshi Hokkaido Univ., Fac.of Eng.Associate Professor, 工学部, 助教授 (50091476)
TAGASHIRA Hiroaki Hokkaido Univ., Fac.of Eng.Professor, 工学部, 教授 (10001174)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Nitrogen-dioxide / Decomposition by discharge / lonization coefficient / LID / Glow discharge / Electron attachment coefficient / Decomposition by UV |
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| Research Abstract |
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.
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