Effect of Hydrogen Addition to Natural Gas on HCCI Engine Emissions Using a Single Zone Thermodynamic Simulation

Effect of Hydrogen Addition to Natural Gas on HCCI Engine Emissions Using a Single Zone Thermodynamic Simulation

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Part of #Effect of Hydrogen Addition to Natural Gas on HCCI Engine Emissions Using a Single Zone Thermodynamic Simulation# :

Publishing year : 2010

Conference : The first regional engineering conference

Number of pages : 5

Abstract: A wide variety of fuels can be used in HCCI combustion engines. The HCCI combustion process is initiated due to the auto-ignition of a fuel / air mixture which is dominated by chemical kinetics and there is no flame propagation. Therefore, fuel composition has a significant effect on engine performance and emissions, and a detailed reaction mechanism is generally essential for the HCCI combustion analysis. Computational fluid dynamics (CFD) with detailed chemical kinetics could be used to study HCCI combustion of simple fuels, but for most practical fuels, it is computationally too time consuming. The single-zone model, on the other hand, allows to have a detailed chemical kinetics modeling for practical fuels and also gives good results comparing to experimental data. In this study, the effect of hydrogen addition on methane combustion was investigated using a CHEMKIN single-zone model with a detailed chemical mechanism in order to investigate the combustion phenomena and to analyze the emissions and pressure distribution in a HCCI engine. There is a different mixture of natural gas-hydrogen with hydrogen ranging from 0 to 90 percent is used. The addition of hydrogen in the variable concentrations significantly increases the reactivity of the natural gas blend used (methane-ethane 10: 1), especially under fuel-lean conditions. The results indicate that the increasing hydrogen component reduces CO, CO2 and unburned hydrocarbons while it accelerates ignition timing and enhances peak pressure and temperature