Hydrogen added to natural gas improves the process of combustion with the possibility to develop engines with higher performance and lower environmental impact. In this chapter, experimental analyses on multi-cylinder heavy duty engines, fuelled with natural gas-hydrogen blends, are reported. Theoretical aspects on engine performance are illustrated and a formula to evaluate the benefit of H2 addition on NG combustion is defined. Experimental data on the effects of air index and exhaust gas recycling on combustion with different NG/H2 blends are discussed followed by an experimental comparison of stoichiometric and lean-burn strategies on the European transient cycle for heavy duty emission certification. Results of the study indicate that a right metering of hydrogen into the natural gas and an optimization of the charge dilution provides not only a reduction in tailpipe CO2 emissions and a more complete combustion process with a lower formation of THC and CO, but also a possible increase in engine efficiency, avoiding abnormal combustion phenomena.
CITATION STYLE
De Simio, L., Gambino, M., & Iannaccone, S. (2016). Using Natural Gas/Hydrogen Mixture as a Fuel in a 6-Cylinder Stoichiometric Spark Ignition Engine. In Green Energy and Technology (pp. 175–194). Springer Science and Business Media Deutschland GmbH. https://doi.org/10.1007/978-3-319-22192-2_10
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