Studying the temperature field in the furnace of a coal-fired boiler is of great significance to reasonably change the operating conditions of the boiler and improve the efficiency of the boiler. In this study

a58 MW swirling pulverized coal-fired boiler is taken as the research object. A physical model is established according to the actual size of the boiler

the reliability of the calculated data is verified by field test data. Based on the principle of computational fluid mechanics

the numerical solution of combustion temperature field in boiler furnace under 6 kinds of working conditions is carried out using appropriate boundary conditions and reasonable assumptions. And the temperature distribution of the furnace is analyzed. The result shows that

this type of pulverized coal-fired boiler operates optimally under the condition that the load rate is 80% and the ratio of internal and external secondary air volume is 4:1. The obtained results have important reference value for improving the energy efficiency of coal-fired industrial boilers.