Abstract: The reaction process of pulverized coal in reducing atmosphere has both the characteristics of combustion and gasification,which is the key factor of low-NOxcombustion for pulverized coal.The appropriate chemical reaction model is the basis for accurate simulation of the process. In this paper,the numerical simulation accuracy was studied based on the double cone burner by comparing results of EDM model,PDF model and FR/ED model under the conditions of oxidation atmosphere and reducing atmosphere.Also,by comparing with the experimental results,the chemical reaction models suitable for different reaction atmosphere were determined. The results show that,there are differences among the three models in the prediction of pulverized coal ignition position and back-flow injection distance.The ignition point of PDF model is closer to the back-flow injection nozzle of burner.For EDM model,the primary air and pulverized coal gradually burn after a period of temperature rise process,and the temperature rise process for FR/ED model is longer,and the low-temperature area of wall nearly covers half of the front cone length.When FR/ED model is used to simulate the combustion process,the average temperature is the highest,the EDM model is the second,and the PDF model is the lowest.The CO reaction is not considerd in the EDM model,and there is almost no CO in the burner. The high CO concentration area for PDF model is concentrated in the early stage of pulverized coal combustion,and the CO content at the outlet of burner is low. While The kinetic parameters of chemical reaction in FR/ED model,the high CO concentration in the whole area of pulverized coal combustion is found.Considering the effect of gasification reaction of coal and oxygen,the oxygen content in the burner simulated by FR/ED model is significantly lower than that of EDM and PDF model.When the excess air coefficient is 1.2,the oxygen content at the burner outlet is 7.0%,which is significantly lower than 11.1%of EDM model and 12. 0% of PDF model. The CO content at the burner outlet is 3. 5%,which is significantly higher than ～ 0% of EDM model and 0.8% of PDF model.When the excess air coefficient is 0.5,the prediction results of the EDM model for CO composition are quite different.The CO concentration at the burner outlet is 0.05%.The CO content at the burner outlet is 5.73% and 10.7%,by using PDF and FR/ED models,respectively.Through the comparison between simulation and experimental results for the oxidation atmosphere,the combustion reaction of pulverized coal mainly occurs. The prediction of temperature and CO content of EDM model and PDF model is more accurate,and the deviation of FR/ED model is larger with less deviation from the test data.Under the reducing atmosphere,the simulation results of EDM model hardly generate CO and H2,which is not suitable for reducing atmosphere,while the PDF model and FR/ED model have reasonable simulation results.The difference is mainly the generating position of reducing gas.The CO concentration at the nozzle of PDF model is higher than that at the outlet,while the CO concentration of FR/ED model increases gradually with the process of pulverized coal reaction,which is closer to the test results.Considering comprehensively,EDM model and PDF model are suitable for the simulation of biconical burner in oxidation atmosphere,and FR/ED model is suitable for the simulation in reduction atmosphere.