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Effect of H2 addition on combustion and exhaust emissions in a heavy-duty diesel engine with EGR.
- Source :
-
International Journal of Hydrogen Energy . Dec2018, Vol. 43 Issue 50, p22658-22668. 11p. - Publication Year :
- 2018
-
Abstract
- Abstract The effect of the addition of hydrogen (H 2) on the combustion process and nitric oxide (NO) formation in a H 2 -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.) H 2 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.) H 2 on the combustion process and formation of NO in H 2 -diesel dual fuel engines. When the engine was at N = 1200 rpm and 70% load, the simulation results showed that the addition of H 2 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.) H 2. In comparison, the maximum peak heat release rate was observed with the addition of 16% (vol.) H 2. The addition of H 2 was a crucial factor dominating the increased NO emissions. Meanwhile, the addition of H 2 reduced soot emissions substantially, which may be due to the reduced diesel fuel burned each cycle. Furthermore, proper combination of adding H 2 with EGR can improve combustion performance and reduce NO emissions. Highlights • Numerical model used to explore effect of H 2 addition on diesel engine performance. • H 2 addition improves combustion, reduces soot, but increases NOx emissions. • Combined H 2 addition/EGR improves combustion performance, reduces NOx emissions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 43
- Issue :
- 50
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 133168748
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2018.10.104