One-dimensional Combustion Simulation for Different Hydrogen-enriched Natural Gas Blends

Land-based gas turbines are one of the most practical turbines that use natural gas as the main fuel. Since natural gas is produced with different composition in refinery process, it can lead to change widely the combustion characteristics. Due to avoid from the effect of this undesirable variation on combustion characteristics, different methods are suggested. One of these methods is injection of Hydrogen into the main fuel (i.e. Natural gas). Hydrogen fuel has some desirable properties such as low activation energy, high reaction rate and high burning velocity which makes hydrogen as a suitable additive for the modification of combustion characteristics of hydrocarbon fuels. The main purpose of the present study is to study the effect of two different chemical kinetics, effect of natural gas composition variations, effects of Hydrogen addition into different composition of the natural gas to achieve better combustion characteristics and also, study of pressure effect on combustion properties. It is observed that in working conditions of this study, GRI3.0 kinetic has better results in comparison with AramcoMech1.3 kinetic. Also, addition of Hydrogen in a specific volumetric percentage into main fuel causes to modify combustion properties, for instance increasing flammability limits.