Abstract
Abstract In the scope of the H2mGT project, a micro gas turbine (mGT) burner with 100% hydrogen firing is developed. The project is a collaboration between TUB and the manufacturer Euro-K GmbH. It consists of three phases: 1. Atmospheric pressure tests with a fused silica combustion chamber; 2. Atmospheric pressure tests with counterflow-cooled steel flame tube and secondary air injection; 3. Validation of the burner in the mGT at elevated pressure levels. The current study will present the results of Phase 2. The hydrogen burner used in the project is based on a swirlstabilized burner of TUB and was scaled to 36 kW thermal power at atmospheric conditions. The burner design features a variable swirl intensity, a movable central fuel lance and pilot nozzles at the front plate. The burners steel flame tube is exchangeable, which allows the evaluation of different dilution hole patterns and, thus, the variation of the primary and secondary air. The study presents temperature, pressure, and emission measurements. It is found that the flame can be operated over a large range of equivalence ratios and preheating temperatures up to 500°C. The NOx emissions are mainly influenced by the local equivalence ratio, which can be controlled by the fuel mass flow or the dilution hole pattern in the flame tube. Furthermore, the results show a decrease of NOx when the power density is increased at constant equivalence ratios, and a rise of NOx during the fuel transition from natural gas to hydrogen.
Published Version
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