2023 Fiscal Year Final Research Report
Carbon Dioxide Capture From Gas Engine Exhausts
| Project/Area Number |
19K15234
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 24020:Marine engineering-related
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| Research Institution | National Institute of Maritime, Port and Aviation Technology |
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Principal Investigator |
Takahashi Chiori 国立研究開発法人海上・港湾・航空技術研究所, 海上技術安全研究所, 研究員 (40399530)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | CO2回収 / 凝華 |
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| Outline of Final Research Achievements |
LNG and LPG have attracted attention as bridge fuels for net-zero GHG emissions until technologies are established for hydrogen and ammonia. However, the CO2 reduction rate using LNG and LPG is expected to be only about 25% compared to conventional fuels. Therefore, the CO2 capture on board (Onboard carbon capture and storage) system will be an attractive technology.
In this study, considering economics and safety, a method using CO2 sublimation by cooling and compression was studied for gas-fueled ships. To date, among the configurations of capture equipment required to achieve the goal of capturing 60% of the CO2 emitted from gas engines, It was investigated marine gas dryers and conducted experiments to capture CO2 from the exhaust gas of a small generator engine and confirmed that it is possible to capture it as dried ice. However, the initially planned tests using the pressure swing sublimation process weren’t conducted.
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| Free Research Field |
環境分析
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| Academic Significance and Societal Importance of the Research Achievements |
LNGを利用したガスエンジンはGHG削減のためのブリッジ燃料として注目を集めており、短中期的に利用可能に最も現実的な選択肢と考えられている。ガスエンジンの利用は、大気汚染物質（SOxやブラックカーボンなど）も大幅に削減可能である。ただし、CO2排出率については最大でも25%程度の削減であり、かつCO2の25倍の地球温暖化係数を持つメタンスリップの問題が懸念事項として挙げられている。これらの課題を改善するため、舶用ガスエンジンの排ガスからのCO2、CH4の回収を検討した。本技術により、将来的に大気中CO2と自然エネルギーを利用した合成メタンが普及すれば、ネガティブエミッションも可能である。
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