To solve such problems as high temperature corrosion and burner outlet burnt occurred in water wall and furnace side wall in boilers equipped with HT-NR3 swirl burners

the burner flaring angle was changed from 45°to 35°

and cold-state tests were carried out on the HT-NR3 swirl burner with the above two burner flaring angles.The results show that

compared with the burner with flaring angle of 45°

the one with that of 35°has smaller recirculation zone and outlet gas spread angle

wider regulation range of outer secondary air swirl blade and stronger adaptability for coal type.Therefore

it can prevent the burner outlet from slagging and being burnt effectively

which improved the stability of the combustion and was helpful to the reduction of NOx emission.