In order to better monitor the temperature condition of the heating surface and improve the efficiency and safety of the coal-fired boiler

numerical simulation method is used to analyze the effects of various factors on the heat load distribution

temperature field and velocity field for a 670 MW supercritical boiler in a power plant. The results show that in the main combustion zone

the temperature decreases with the increase of the burnout air rate. In the burnout zone

the temperature increases with the increase of the burnout air rate. When the burnout air rate increases

a large amount of incompletely burned carbon is burned in the burnout zone

and there is an increasing trend in the concentrated heat load area. In addition

the excess air coefficient is also an important index affecting the heat load distribution. The larger the excess air coefficient

the more the high temperature flame moves to the center of the furnace chamber

which makes the heat load distribution more uniform

thus reducing the local high-temperature region and lowering the thermal stress in the furnace chamber. However

the excess air coefficient is too large

which will cause a large deviation in the airflow velocity of the furnace chamber outlet

which is not conducive to the safe operation of the boiler.