Effect of H2 addition on combustion and exhaust emissions in a heavy-duty diesel engine with EGR |
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Authors: | Lijun Wang Dong Liu Zhenzhong Yang Hailin Li Leyu Wei Quancai Li |
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Affiliation: | 1. School of Mechanical Engineering/Institute of Vehicles and New Energy Technology, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China;2. Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV, 26506-6106, USA |
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Abstract: | The effect of the addition of hydrogen (H2) on the combustion process and nitric oxide (NO) formation in a H2-diesel dual fuel engine was numerically investigated. The model developed using AVL FIRE as a platform was validated against the cylinder pressure and heat release rate measured with the addition of up to 6% (vol.) H2 into the intake mixture of a heavy-duty diesel engine with exhaust gas recirculation (EGR). The validated model was applied to further explore the effect of the addition of 6%–18% (vol.) H2 on the combustion process and formation of NO in H2-diesel dual fuel engines. When the engine was at N = 1200 rpm and 70% load, the simulation results showed that the addition of H2 prolonged ignition delay, enhanced premixed combustion, and promoted diffusion combustion of the diesel fuel. The maximum peak cylinder pressure was observed with addition of 12% (vol.) H2. In comparison, the maximum peak heat release rate was observed with the addition of 16% (vol.) H2. The addition of H2 was a crucial factor dominating the increased NO emissions. Meanwhile, the addition of H2 reduced soot emissions substantially, which may be due to the reduced diesel fuel burned each cycle. Furthermore, proper combination of adding H2 with EGR can improve combustion performance and reduce NO emissions. |
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Keywords: | Diesel engine with EGR Combustion process NO formation |
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