Reduction of Methane Slip from Marine Gas Engines by Oxygen Stratification using Gas Permeation Membrane
| Project/Area Number |
24246144
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
TASHIMA Hiroshi 九州大学, 総合理工学研究科(研究院), 准教授 (70179688)
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| Co-Investigator(Kenkyū-buntansha) |
TAKASAKI Koji 九州大学, 総合理工学研究院, 教授 (30154769)
TSURU Daisuke 九州大学, 総合理工学研究院, 助教 (10614620)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥36,400,000 (Direct Cost: ¥28,000,000、Indirect Cost: ¥8,400,000)
Fiscal Year 2014: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2013: ¥20,540,000 (Direct Cost: ¥15,800,000、Indirect Cost: ¥4,740,000)
Fiscal Year 2012: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
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| Keywords | ガスエンジン / 気体分離膜 / メタンスリップ / 天然ガス / 窒素酸化物 / ノッキング / 成層給気 / 急速圧縮膨張装置 / 温暖化抑制 |
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| Outline of Final Research Achievements |
Gas engines are expected as strong substitutes for marine diesel engines, but premixed lean-burn gas engines suffer two massive flaws. One is abnormal combustion called knocking and the other is methane slip. This research proposes a novel reducing method of the methane slip through usage of a gas permeation membrane (GPM). The GPM forms stratified oxygen gradient inside a combustion chamber. O2-rich premixture biased toward a cylinder wall decreases a quenching distance and N2-rich premixture around a cylinder center controls knock tendency and NOx emission.
Following issues were numerically investigated, feasibility of a twin turbo-charging system, possibility of oxygen stratification during compression, and potential of the methane slip reduction on chemical analysis. Finally, combustion tests were done using a constant-volume chamber and a rapid compression-expansion machine, and the system was found to compromise the knock avoidance and the methane slip reduction effectively.
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Report
(4 results)
Research Products
(55 results)
