Session: 04-32 Emissions II

Paper Number: 128558

128558 - NOx Emissions Assessment of a Multi Jet Burner Operated With Premixed High Hydrogen Natural Gas Blends 

Decarbonization of gas turbine combustion creates a pressing demand for new technical solutions for the combustion process. While switching to hydrogen fuels may solve the problem of carbon emissions and associated pollutants it can also lead to stability issues for swirl-stabilized combustors due to its increased reactivity. However, with jet flame burner systems, the required flashback safety can be achieved with high axial flow velocities even for premixed combustion of 100% hydrogen fuel. The development of such an engineering solution, however, requires significant effort to reach the maturity of today’s swirl burners.

This study examines the capacity of a premixed multi-tube jet burner to manage the chemical reactivity change over a range of volumetric blends from pure natural gas to pure hydrogen fuel. Furthermore, it evaluates the combustion performance in terms of flash back and emissions.

NOx emissions are measured and analyzed for both atmospheric and high-pressure tests. The changes in emissions originate not only from altered combustion chemistry but also from changes in fuel momentum and resulting mixture quality. The effect of the fuel momentum ratio on mixture quality is assessed using water tunnel measurements. To get a deeper understanding of the NOx formation process, a low-order model is designed and compared to the experimental data of technically and perfectly premixed combustion tests. The information on the combustion process required for the model is obtained computationally and experimentally. Therefore, flame images are recorded. This dataset is enhanced by temperature measurements taken at the burner front plate, illustrating how fuel composition affects both flame anchoring and stability.

Presenting Author: Alexander Jaeschke Technische Universität Berlin

Presenting Author Biography: Studied engineering science at Technical University of Berlin.
Currently completing his PHD at the at TU Berlin on gas turbine combustion.

Authors:

Alexander Jaeschke Technische Universität Berlin
Bernhard Cosic MAN Energy Solutions
Dominik Wassmer MAN Energy Solutions
Christian Oliver Paschereit Technische Universität Berlin