2023 Fiscal Year Final Research Report
Reformation of methane by low temperature plasma and UV radiation
Project/Area Number |
21K03913
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 19020:Thermal engineering-related
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Research Institution | Chiba University |
Principal Investigator |
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Project Period (FY) |
2021-04-01 – 2024-03-31
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Keywords | メタンスリップ / 炭素析出 |
Outline of Final Research Achievements |
Methane, the main component of natural gas, has a high global warming potential of 25, so it is necessary to suppress the emissions of unburned methane that is emitted due to incomplete combustion. Therefore, we proposed a simple reforming of the methane inhaled as fuel to create a fuel with a low global warming potential. For this purpose, we used low-temperature plasma, had a methane conversion rate of 45%, a hydrogen concentration of 32%, and introduced an extremely short pulse power source, achieving an efficiency of 12%, and we were able to confirm discharge even at atmospheric pressure. A combustion test using a constant volume chamber confirmed that the combustion period of the reformed gas was shortened and the unburned methane and CO concentrations were reduced. The combustion period is 20% shorter in relative terms compared to regular methane. Unburned methane was reduced by 60%.
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Free Research Field |
熱流体工学
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Academic Significance and Societal Importance of the Research Achievements |
天然ガスは燃焼時の二酸化炭素排出が少ないことから,エネルギー資源として重要視されている.一方で,天然ガスの主成分であるメタンは地球温暖化係数が高く,不完全燃焼などで排出される未燃メタン(メタンスリップと呼ぶ)の排出を抑制する必要がある.メタンスリップの低減には触媒等を使った後処理が考えられるが,高効率燃焼方式はメタンの特性を生かした希薄燃焼で排ガス温度が低く困難である.そこで,燃料として吸入するメタンを改質することを提案した.低温プラズマを照射することで,メタンを簡単に高効率に変化することができた.これを吸気前の燃料に応用することで,メタンスリップを低減することが可能になる.
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