This study investigates the use of ammonia as a carbon-free fuel for gas turbines in decarbonized hybrid energy systems. The objective is to predict the emission characteristics of a gas turbine combustion chamber operating on gaseous ammonia by employing detailed combustion kinetics. The chamber is modeled as a network of chemical reactors to simulate the primary reaction zone and the secondary air-mixing zone. The model is based on solving mass and energy conservation equations for chemically reacting flows. Four high-temperature ammonia oxidation mechanisms, comprising 71 to 286 chemical reactions, were used as kinetic schemes. New data were obtained on flame propagation, temperature distributions, and concentrations of stable species at the burner outlet. Calculations were performed for a pressure of 2.0 MPa and an air excess coefficient ranging from 2.36 to 3.55. The dependencies of toxic emissions on ammonia mass flow rate were demonstrated. The results apply to the practical development of gas turbine engines for decarbonized hybrid energy systems.
Serbin et al. (Thu,) studied this question.