| Project/Area Number |
12650287
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | Oita University |
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Principal Investigator |
NOMOTO Yukiharu Oita University, Faculty of Engineering, Professor, 工学部, 教授 (90037953)
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| Co-Investigator(Kenkyū-buntansha) |
KANAZAWA Seiji Oita University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (70224574)
OHKUBO Toshikazu Oita University, Faculty of Engineering, Professor, 工学部, 教授 (00094061)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | ozone / ozonizer / silent discharge / ozone yield / ozone generation efficiency / rod-to -rod electrode |
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| Research Abstract |
The silent discharge is mainly used for ozone generation in an ozonizer. Most practical ozonizer has a coaxial cylindrical electrode system with a gap spacing of 1-2 mm and 1-2 m length. In this electrode geometry, ozone created by a silent discharge is destroyed by next discharge when gas passes the narrow and long discharge gap field. In this study, instead of conventional coaxial cylindrical electrode system, a rod-to-rod electrode system is used. The proposed ozonizer consists of nine units of the electrode system which are mounted in parallel in a box type reactor. Therefore, in this ozonizer, a screen type discharge can be produced. The main results are summarized as follows.
(1) In the case of the ozonizer with one unit of rod-to-rod electrode system, the optimum gap spacing was 0.7-1.0 mm. Filamentary uniform discharge can be obtained along the gap.
(2) Maximum ozone generation efficiency of 123 g/kWh (discharge power 0.7 W, ozone concentration : 340 ppm) for dry air and 375 g/kWh (discharge power 0.5 W, ozone concentration : 745 ppm) for oxygen was obtained in the ozonizer with three electrode screens at the gas flow rate of 2 L/min.
(3) Typical ozone generation characteristics of ozone concentration : 2500 ppm and ozone generation efficiency : 100 g/kWh for air and 5500 ppm and 200 g/kWh for oxygen are obtained in three screens ozonizer.
(4) Maximum ozone concentration of 3400 ppm (amount of ozone generation : 860 mg/h, ozone generation efficiency : 82 g/kWh) for air and 6800 ppm (amount of ozone generation : 1740 mg/h, ozone generation efficiency : 173 g/kWh) for oxygen are obtained.
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