To realize stable combustion and refined combustion adjustment of boilers and to gain an in-depth understanding of the jet characteristics of direct flow pulverized coal burners

by taking the pulverized coal burner with surrounding air and its horizontal branch of the secondary air of a quadrangular tangentially pulverized coal boiler as research objects

the effects of throttle column height

secondary air door opening

and wind baffle angle on airflow characteristics are analyzed by numerical simulation under thermal condition. The calculation results show that

for the pulverized coal burner with a small nozzle area of the surrounding air and a thicker horizontal branch of secondary air

adding a throttle column at the position of a secondary air door can effectively improve the uniformity of velocity distribution of the nozzle area of the surrounding air. The opening degree of the secondary air door poses no noticeable effect on the airflow velocity distribution near the nozzle area of the surrounding air

and adding a wind baffle at the burner nozzle can improve the rigidity of primary air and the protection of surrounding air to primary air.