Kinetic Characterization and NO x Reduction Mechanism of Mixed Ammonia-Hydrogen Combustion in Cyclone Combustor

doi:10.12096/j.2096-4528.pgt.23183

Abstract

Abstract:

Objective Ammonia plays a key role in achieving the “dual carbon” goal, but ammonia has a low combustion rate and high NO _x emission. In order to improve the combustion rate, a method of ammonia-hydrogen blending combustion was proposed. Methods The combined computational fluid dynamics and ammonia-hydrogen mixed combustion mechanism are used to numerically simulate the premixed combustion of ammonia, hydrogen and air. The effects of equivalent ratio and inlet air flow on combustion characteristic and NO _x emission are analyzed. In addition, in order to better control the emission of NO _x during combustion, the kinetic analysis of ammonia-hydrogen blending combustion reaction is carried out using Chemkin software. Results Increasing the inlet air flow rate and equivalent ratio can effectively reduce NO emission in cyclone burners, and the main way of NO formation is the oxidation of imino groups. Conclusion The results provide a reference for the characterization analysis of ammonia-hydrogen miscible combustion and the reduction of NO _x emissions in cyclone combustors.

Key words: double carbon, ammonia doped with hydrogen, premixed combustion, numerical simulation, NO _x emission, characteristics of combustion kinetic, cyclone combustor

CLC Number:

TK 19

Kaihui WANG, Bin LIU, Xiaohui ZHE, Wei LIU, Hao FAN, Zongyao KANG, Li XU. Kinetic Characterization and NO _x Reduction Mechanism of Mixed Ammonia-Hydrogen Combustion in Cyclone Combustor[J]. Power Generation Technology, 2025, 46(1): 171-179.

Figures/Tables 9

Fig. 1 Physical model of the combustion chamber

Fig. 2 Average axial velocity and radial velocity distribution of different cross-sections of the combustion

Fig. 3 Comparison of laminar flame velocities under different equivalent ratios

Fig. 4 Axial velocity distribution of combustion chamber sections (x/RC=1)

Fig. 5 Effect of equivalent ratio on combustion chamber temperature distribution and NO emission

Fig. 6 Effect of equivalent ratio on the emission concentration of flue gas at the outlet of the combustion chamber

Fig. 7 Effect of inlet air flow on combustion chamber temperature distribution and NO emission

Fig. 8 Effect of inlet air flow on the concentration of flue gas emission at the outlet of the combustion chamber

Fig. 9 Combustion reaction path

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