MILD oxygen combustion technology is a more energy-saving and emission-reducing technology developed from the MILD combustion technology. In order to find a nozzle structure that is more conducive to MILD oxygen combustion

this article has designed a unilateral inclined bell mouth nozzle. Four different nozzle structures were set up by changing the direction of the opening of the asymmetric nozzle horn

and numerical simulations were performed under the same conditions for various parameters. Moreover

from the aspects of speed field

vorticity field

component field and temperature field

the asymmetrical nozzles were analyzed. The results show that

the asymmetric jet nozzles can disperse the jet gas into many micelles with small size. The direction of inclination of the large momentum nozzles in different nozzle structures affects the direction of the flow field and the reflow area. For the nozzle with structure that the inclined surface placed outwards

the diffusion of small size micelles resulting from the dispersion of the airflow is the best

the CO concentration is the minimum

the reflux flue gas has the best O2 dilution effect

and the temperature distribution is the most uniform

so nozzle with this structure is most beneficial to the realization of MILD oxygen combustion.