The Fluent software was applied to conduct numerical simulation on a 300MW tangentially pulverized coal-fired boiler

for which the burners were modified by adopting stereo-staged process of low NOx combustion technique.The velocity field

temperature field

component field and NOx concentration field in furnace were simulated under rated condition before and after the modification.The calculated values were compared with the experimental data

and they agreed well with each other

verifying the accuracy of numerical calculation.The results show that:slagging and high-temperature corrosion in furnace could be effectively controlled by adopting the stereo-staged process of low NOx combustion technique

and NOx emission concentration reduced by about 40% compared after the modification.