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EXPERIMENTAL STUDY ON HIGH PRESSURE COMBUSTION OF DECOMPOSED AMMONIA: HOW CAN AMMONIA BE BEST USED IN A GAS TURBINE?

EXPERIMENTAL STUDY ON HIGH PRESSURE COMBUSTION OF DECOMPOSED AMMONIA: HOW CAN AMMONIA BE BEST USED IN A GAS TURBINE?

Category
Academic lecture
Abstract
Hydrogen is a challenging gas to transport and store, unless
it is transformed to ammonia, a worldwide distributed chemical.
Ideally, ammonia would be used directly on site as a fuel, but it
has a very low reactivity and a high propensity to generate NOx.
Alternatively, it can be decomposed to a mixture of hydrogen and
nitrogen which has better combustion properties at the expense
of an endothermal reaction. A suitable trade off could be a
partial decomposition where the fuel is a mixture of ammonia,
hydrogen, and nitrogen. We present an experimental study
aiming at finding optimal NH3-H2-N2 fuel blends to be used in
gas turbines and provide manufacturers with guidelines for their
use in retrofit and new combustion applications. The industrial
burner considered in this study is a small-scale Siemens burner
used in the SGT-750 gas turbine, tested in the SINTEF high
pressure combustion facility. The overall behaviour of the burner
in terms of stability and emissions is characterized as a function
of fuel mixtures corresponding to partial and full decomposition
of ammonia. It is found that when ammonia is present in the fuel,
the NOx emissions although high can be limited if the primary
flame zone is operated fuel rich. Increasing pressure has shown to have a strong and favourable effect on NOx formation. When
ammonia is fully decomposed (75% H2 and 25% N2), the opposite
behaviour is observed. In conclusion, either low rate or full
decomposition are found to be the better options.
Client
  • Research Council of Norway (RCN) / 296207
  • CLIMIT DEMO/Gassnova / 617137
Language
English
Author(s)
Affiliation
  • SINTEF Energy Research / Termisk energi
  • Unknown
Presented at
ASME Turbo Expo 2021
Place
Virtual
Date
07.06.2021 - 11.06.2021
Organizer
ASME
Year