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CFD based exploration of the dry-low-NO_(x) hydrogen micromix combustion technology at increased energy densities

Propulsion and Power Research 2017年第1期6卷 15-24页

作者： a.haj ayed K.Kusterer H.H.-W.Funke J.Keinz D.Bohn B&B-AGEMA GmbH.Jiilicher Str.338 Aachen 52070Germany FH Aachen University of Applied Sciences Hohenstaufenallee 6Aachen 52064Germany RWTH Aachen University Templergraben 55Aachen 52062Germany

Combined with the use of renewable energy sources for its production,hydrogen represents a possible alternative gas tuibine fuel within future low emission power *** to the large difference in the physical properties of hydrogen compared to other fuels such as natural gas,well established gas tuibine combustion systems cannot be directly applied for dry-low-NO_(x)(DLN)hydrogen ***,the development of DLN combustion technologies is an essential and challenging task for the future of hydrogen fuelled gas *** DLN micromix combustion principle for hydrogen fuel has been developed to significantly reduce NO_(x)-*** combustion principle is based on cross-flow mixing of air and gaseous hydrogen which reacts in multiple miniaturized diffusion-type *** major advantages of this combustion principle are the inherent safety against flash-back and the low NO_(x)-emlssions due to a very short residence time of reactants in the flame region of the *** micromix combustion technology has been already proven experimentally and numerically for pure hydrogen fuel operation at different energy density *** aim of the present study is to analyze the influence of different geometry parameter variations on the flame structure and the NO_(x)emission and to identify the most relevant design parameters,aiming to provide a physical understanding of the micromix flame sensitivity to the burner design and identify further optimization potential of this innovative combustion technology while increasing its energy density and making it mature enough for real gas turbine *** study reveals great optimization potential of the micromix combustion technology with respect to the DLN characteristics and gives insight into the impact of geometry modifications on flame structure and NO_(x)*** allows to further increase the energy density of the micromix burners and to integrate this technology in industrial gas turbin

关键词： Micromix combustion Hydrogen gas turbine Dry-low-NO_(x)(DLN)combustion Hydrogen combustion High hydrogen combustion

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Improvement study for the dry-low-NO_(x) hydrogen micromix combustion technology

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Propulsion and Power Research 2015年第3期4卷 132-140页

作者： a.haj ayed K.Kusterer H.H.-W.Funke J.Keinz C.Striegan D.Bohn B&B-AGEMA GmbH Jülicher Str.338Aachen 52070Germany FH Aachen University of Applied Sciences Hohenstaufenallee 6Aachen 52064Germany RWTH Aachen University Templergraben 55Aachen 52062Germany

The dry-low-NO_(x)(DLN)micromix combustion principle is developed for the low emission combustion of hydrogen in an industrial gas turbine APU GTCP *** further decrease of NO_(x) emissions along a wider operation range with pure hydrogen supports the introduction of the micromix technology to industrial *** and numerical studies show the successful advance of the DLN micromix combustion to extended DLN operation *** impact of the hydrogen fuel properties on the combustion principle and aerodynamic flame stabilization design laws,flow field,flame structure and emission characteristics is investigated by numerical analysis using an eddy dissipation concept combustion model and validated against experimental results.

关键词： Hydrogen NO_(x) Emission reduction Micromix Jet in cross-flow Combustion

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Experimental and numerical investigations of the dry-low-NO_(x) hydrogen micromix combustion chamber of an industrial gas turbine

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Propulsion and Power Research 2015年第3期4卷 123-131页

Combined with the use of renewable energy sources for its production,hydrogen represents a possible alternative gas turbine fuel within future low emission power *** 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-NO_(x)(DLN)hydrogen ***,the development of DLN combustion technologies is an essential and challenging task for the future of hydrogen fuelled gas *** DLN micromix combustion principle for hydrogen fuel has been developed to significantly reduce NO_(x) *** combustion principle is based on cross-flow mixing of air and gaseous hydrogen which reacts in multiple miniaturized diffusion-type *** major advantages of this combustion principle are the inherent safety against flash-back and the low NO_(x) emissions due to a very short residence time of reactants in the flame region of the *** micromix combustion technology has been already proven experimentally and numerically for pure hydrogen fuel operation at different energy density *** aim of the present study is to apply and compare different combustion models for the characterization of the micromix flame structure,its interaction with the flow field and its NO_(x) *** study reveals great potential for the successful application of numerical flow simulation to predict flame structure and NO_(x) emission level of micromix hydrogen combustion,help understanding the flow phenomena related with the micromixing,reaction zone and NO_(x) formation and support further optimization of the burner performance.

关键词： Micromix combustion Hydrogen gas turbine Dry-low-NO_(x)(DLN) combustion Hydrogen combustion High hydrogen combustion

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