Strategies for improving premixed oxy-fuel combustion in spark-ignition engines
[EN] Oxy-fuel combustion in internal combustion engines is a promising technology that eases Carbon Capture and Storage and allows near-zero NOx powerplants. While some experimental and theoretical studies on oxyfuel combustion engines are available in the literature, there is a lack of systematic r...
| Authors: | , , , |
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| Format: | article |
| Publication Date: | 2026 |
| Country: | España |
| Institution: | Universitat Politècnica de València (UPV) |
| Repository: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Language: | English |
| OAI Identifier: | oai:dnet:riunet______::1c6f1fb74457f30c63ad706e54a8d08d |
| Online Access: | https://riunet.upv.es/handle/10251/233929 |
| Access Level: | Open access |
| Keyword: | Oxy-fuel combustion Efficiency Carbon capture MIEC Zero NOx CO2 capture |
| Summary: | [EN] Oxy-fuel combustion in internal combustion engines is a promising technology that eases Carbon Capture and Storage and allows near-zero NOx powerplants. While some experimental and theoretical studies on oxyfuel combustion engines are available in the literature, there is a lack of systematic research on dilution strategies or on the use of non-synthetic exhaust gas recirculation. This study uses a combination of 0D-1D and CFD modeling and experimental measurements to assess the use of oxygen dilution and real exhaust gas recirculation in a single-cylinder spark-ignition engine operation under oxy-fuel combustion conditions. A comparison between conventional and oxy-fuel combustion is first performed to highlight the differences between the two combustion modes. Later, taking into account the thermo-mechanical limitations and knocking restrictions, several strategies are analyzed to improve oxy-fuel combustion efficiency: exhaust gas recirculation ratio, compression ratio, and intake temperature. Results show that under oxy-fuel mode, operating at stoichiometric conditions with exhaust gas recirculation rates around 70%, reduces NOx by more than 99%, and CO and uHC by up to 89% compared to conventional combustion with air. In terms of performance, an 8 pp reduction in gross indicated efficiency could be expected; however, since knocking propensity is reduced, the compression ratio can be increased to recover about 5 pp of the efficiency drop. |
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