Abstract
Combined with the storage and use of renewable energy sources and the application of the integrated gasification combined cycle (IGCC) technology, high hydrogen content fuels represent a possible alternative gas turbine fuel within future low emission power generation. Due to the large difference in the physical properties of hydrogen compared to other fuels such as natural gas, well established gas turbine combustion systems cannot be directly applied for dry-low-NOx (DLN) hydrogen and syngas combustion. Thus, the development of DLN combustion technologies is an essential task for the future of hydrogen and syngas fueled gas turbines. The DLN micromix combustion principle for hydrogen fuel has been developed to significantly reduce NOx-emissions. This combustion principle is based on cross-flow mixing of air and gaseous hydrogen which reacts in multiple miniaturized diffusion-type flames. The major advantages of this combustion principle are the inherent safety against flash-back and the low NOx-emissions due to a very short residence time of reactants in the flame region of the micro-flames. The present study aims to investigate the applicability of the micromix principle to the combustion of syngas with a composition of 90%-Vol. hydrogen and 10%-Vol. carbon-monoxide and compare different combustion models for the numerical characterization of the micromix flames. The micromix principle has been applied to design a DLN syngas burner for the application in gas turbine combustors. The designed burner has been successfully tested at atmospheric conditions and has shown a stable and typical micromix flame and low NOx emission. Different combustion models have been applied to simulate the micromix syngas combustion numerically. The numerical study revealed the ability of the applied numerical approach to simulate the micromix combustion and to capture the typical micromix flame anchoring and structure and supported the identification of adequate reaction mechanisms that allow an acceptable prediction of NOx emissions.
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