Numerical Simulation of Ammonia Hydrogen Combustion in Lean Premixed Combustor
Ammonia has attracted more and more attention because it has no carbon emission when it is burned.The combustion characteristics and pollutant emission of pure ammonia and ammonia-hydrogen hybrid fuel with equivalent calorific value in lean combustion premixed combustion chamber were studied by numerical simulation.The results show that the pure ammonia and the ammonia-hydrogen mixed fuel with the ratio of 10%-50%can be stably burned in the combustion chamber designed in this paper,and the parameters of combustion efficiency and outlet temperature distribution coefficient meet the requirements.With the increase of hydrogen-doped ratio,the temperature of the main combustion zone becomes higher and higher,and the flame shape becomes wider and wider.When the hydrogen-doped ratio reaches 61%,tempering occurs.With the increase of hydrogen-doped ratio,the concentration of NO produced in the main combustion zone increases monotonically.At the outlet of the flame tube,due to the injection of a large amount of air into the mixing and cooling holes,when the hydrogen-doped ratio increases from 0 to 30%,the NO mole fraction monotonically increases to 2.13×10-4,and the concentration of NO decreases when the hydrogen-doped ratio continues to increase.
lean premixed gas turbine combustorammonia-hydrogen hybrid fuelhydrogen-doped rationumerical simulationNOx emission
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