低炭素燃料利用を高める再呼吸支援デュアルフューエル燃焼（Re-DFC）
Rebreathing assisted dual fuel combustion (Re-DFC) to enhance low carbon fuel utilization (原題)
Saurabh K. Gupta, Reed M. Hanson, Sage L Kokjohn
🤖 gxceed AI 要約
日本語
メタノールと軽油のデュアルフューエル燃焼は低負荷域で燃焼効率が悪化し、メタノール利用率が制限される。本研究は排気の一部を再循環させる再呼吸（リブリージング）機構を6.7L重負荷エンジン単筒試験で検証した。再呼吸支援により燃焼効率と未燃排出が改善し、メタノール質量割合は84%に達し、CO2排出を10〜15%削減できると推定された。
English
Dual-fuel methanol–diesel combustion suffers poor efficiency and low methanol substitution at low loads. This study tests rebreathing (exhaust recirculation via modified cam) on a single-cylinder 6.7 L heavy-duty engine at 4 bar IMEP. Rebreathing improved combustion efficiency, cut unburned emissions, kept NOx in check, and raised methanol mass fraction to 84%, yielding an estimated 10–15% CO2 reduction.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
海運・重量輸送・定置発電の脱炭素は日本でも重要課題であり、メタノール燃料の実用化はGX推進の鍵。燃焼効率改善による低炭素燃料利用率向上は、燃料転換コストの低減に寄与し得る。
In the global GX context
Hard-to-abate transport and power sectors are central to global decarbonization pathways; improving low-carbon fuel utilization in dual-fuel engines offers a practical lever for cutting Scope 1 emissions without full powertrain redesign.
👥 読者別の含意
🔬研究者:低負荷デュアルフューエル燃焼の効率・排出特性改善に関する実験的知見を提供する。
🏢実務担当者:メタノール代替率向上とCO2削減の実現可能性を、エンジン導入検討の根拠として活用できる。
🏛政策担当者:海運・重量輸送の脱炭素政策において、低炭素燃料の実用燃焼技術への支援根拠となり得る。
📄 Abstract（原文）
Several transportation and industrial sectors, including marine propulsion, heavy-duty transportation, and stationary power generation, face challenges in decarbonization due to their high energy demand and reliance on liquid fuels. Dual-fuel combustion facilitates the transition to low-carbon fuels by utilizing a low-reactivity fuel, such as methanol, introduced through port fuel injection, while a small quantity of high-reactivity fuel, such as diesel, is directly injected to initiate ignition. This approach enables improved control over combustion phasing, high thermal efficiency, and partial replacement of conventional diesel fuel. However, a major limitation of dual-fuel operation occurs at low loads, where reduced in-cylinder temperatures lead to poor combustion efficiency and incomplete oxidation of the premixed charge. As a result, unburned fuel emissions increase, and a larger fraction of diesel fuel is required to maintain stable combustion, limiting the utilization of the low-carbon fuel. This study investigates a rebreathing-assisted dual-fuel combustion strategy to enhance methanol utilization compared to conventional dual-fuel combustion. Experiments were performed on a 6.7 L Cummins ISB heavy-duty engine configured for single-cylinder methanol–diesel dual-fuel combustion. The engine was operated at a low-load condition of 4 bar IMEP, representative of typical low-load operation. The rebreathing strategy recirculates a portion of the exhaust gases back into the cylinder using a modified cam. Results show that rebreathing assistance significantly improves combustion efficiency and reduces unburned emissions while maintaining NO x emissions in dual-fuel combustion. The strategy also improves gross indicated thermal efficiency, and after accounting for additional pumping losses, the net efficiency remains comparable to conventional diesel operation at moderate rebreathing levels. Most notably, methanol utilization increases substantially, with the methanol mass fraction reaching 84%. This increased substitution of diesel fuel with methanol results in an estimated 10%–15% reduction in CO 2 emissions. These results demonstrate the potential of rebreathing assistance to improve low-load dual-fuel combustion and increase the utilization of low-carbon fuels.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1177/14680874261501587first seen 2026-11-04 04:51:59 · last seen 2026-11-06 04:50:36
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