Numerical study on CH4 combustion characteristics and NOx emission based on anti-diffusion combustion
Anti-diffusion combustion has the characteristics of uniform flame temperature and low pol-lutant emission.Aiming at the natural gas low NOx burner based on anti-diffusion combustion,the combustion characteristics of anti-diffusion combustion of the burner are numerically studied by CFD software,the staged combustion process and the generation characteristics of thermal and rapid NOx are analyzed,and the anti-diffusion combustion organization idea of"air bag wind"is put forward.The effects of different excess air coefficient and flue gas recirculation rate on flow field distribution,temperature field distribution and NOx emission characteristics are studied.The results show that with the increase of excess air coefficient,the flame length becomes shorter,the combustion rate be-comes faster,the combustion condition is improved,and the NOx emission increases first and then de-creases.With the increase of the flue gas recirculation rate,the average flame temperature in the fur-nace and the NOx emission at the outlet both show a downward trend.When the flue gas recirculation rate is 0.20,the NOx emission at the outlet decreases by about 95％,achieving ultra-low emission,which has guiding significance for the application of anti-diffusion flame in industrial production.
low NOx burneranti-diffusion combustionflue gas recirculationstaged combustionnu-merical simulation
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