The influences of hydrogen on the performance and emission characteristics of a heavy duty natural gas engine |
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Authors: | Cheolwoong Park Changgi KimYoung Choi Sangyeon WonYasuo Moriyoshi |
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Affiliation: | a Environmental System Research Division, Engine Research Team, Korea Institute of Machinery and Materials (KIMM), 104 Sinseongno, Yuseong-gu, Daejeon 305-343, Republic of Korea b Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba-shi, Chiba 263-8522, Japan |
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Abstract: | Because blending hydrogen with natural gas can allow the mixture to burn leaner, reducing the emission of nitrogen oxide (NOx), hydrogen blended with natural gas (HCNG) is a viable alternative to pure fossil fuels because of the effective reduction in total pollutant emissions and the increased engine efficiency.In this research, the performance and emission characteristics of an 11-L heavy duty lean burn engine using HCNG were examined, and an optimization strategy for the control of excess air ratio and of spark advance timing was assessed, in consideration of combustion stability. The thermal efficiency increased with the hydrogen addition, allowing stable combustion under leaner operating conditions. The efficiency of NOx reduction is closely related to the excess air ratio of the mixture and to the spark advance timing. With the optimization of excess air ratio and spark advance timing, HCNG can effectively reduce NOx as much as 80%. |
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Keywords: | Natural gas engine Hydrogen and natural gas blends (HCNG) Lean operation limits Thermal efficiency Emissions |
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