| Project/Area Number |
59420027
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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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 | The University of Tokyo |
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Principal Investigator |
MASUDA Senichi Professor, Faculty of Engineering, University of Tokyo, 工学部, 教授 (40010615)
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| Co-Investigator(Kenkyū-buntansha) |
ITAGAKI Toshifumi Technical Official, Faculty of Engineering, University of Tokyo (60242012)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥36,000,000 (Direct Cost: ¥36,000,000)
Fiscal Year 1986: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1985: ¥10,000,000 (Direct Cost: ¥10,000,000)
Fiscal Year 1984: ¥20,000,000 (Direct Cost: ¥20,000,000)
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| Keywords | Electron Beam / De <NO_x> / De <SO_x> / Dose Enhancement / High Voltage Pulse / Corona Discharge / 電気集麈 |
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| Research Abstract |
Tests on removal of <NO_x> and <SO_x> from combustion gas using pulse-induced corona discharge has been performed and it is confirmed that pulsed corona is effective for removal of NO by its oxidation to <NO_2> and removal of <NO_2> by its conversion to other substances. The reaction speed is greatly enhanced by raising the peak field intensity, which requires the use of very sharp pulse. The speed of these two processes by positive pulsing is more than one order of magnitude higher than that by negative pulsing. This is because the positive pulsing produces streamer coronas bridging across the entire electrode gap to produce copious active species in the entire gap space, whereas negative pulsing produces small streamer coronas restricted in an area around the corona wire. However, there is no difference in the energy yield of NO-removal, compared at the same residence time and same total power consumption. <SO_2> can also be removed by pulsing, but the use of negative pulsing does not come into question owing to its too slow effect. The addition of <NH_3> produces <SO_2> -reduction by itself, but it does not produce an additional enhancement of <SO_2> -removal by pulsed corona. When pulsed corona is used for dose enhancement in electron beam De <NO_x> and De <SO_x> , it is mecessary to consider these two processes separately, since there is no evidence for pulsed corona to enhance the effective dose beyond its own effect. However, the volume of the electron beam reactor might be better exploited by pulsed corona without too much additional expenditures. Again in this case, the energy yield of pulsed corona will become the matter of primary concern. In such application, positive pulsing should be used as the gas residence time in the electron beam reactor is short (ca. 3 seconds).
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