고압축비가 적용된 천연가스 대형 엔진에서 수소 혼입 검토 = Examining Hydrogen Mixing in a Natural Gas Heavy-Duty Engine with a High Compression Ratio

다국어 초록 (Multilingual Abstract)

Incorporating hydrogen into natural gas networks is known to be an effective technology for reducing carbon emissions. This study examined hydrogen mixing up to 40% in a natural gas heavy-duty engine with a high compression ratio. Backfire and pre-ignition did not occur in the natural gas engine when hydrogen was mixed up to 40%. However, as hydrogen mixing increased, the ignition timing advance was limited owing to knocking occurrences. Brake thermal efficiency slightly deteriorated with hydrogen mixing, while carbon dioxide emissions decreased with the addition of hydrogen, a carbon-free fuel. As hydrogen mixing increased, engine-out methane emissions decreased, while nitrogen oxides emissions increased. Therefore, compared to natural gas engines, a relatively richer fuel-air mixture is required to control the three-way catalyst for reducing the nitrogen oxides emissions.