In actual production of blast furnace, the injection mode of coal injection gun has many effects on the combustion state of pulverized coal. The suitable arrangement of coal injection gun has a positive impact on the combustion process and production efficiency of pulverized coal. According to the actual production conditions of Zhongtian Steel, in order to clarify the influence of the arrangement of the spray gun on the combustion state in the raceway, the numerical simulation method was used to explore the change of the combustion state in the raceway at different angles and insertion depths. The results show that under the influence of different parameters, the change law of combustion is generally consistent, with differences primarily manifesting in the distribution range and content of each characteristic field within the raceway. As the angle and depth increase, the temperature and pulverized coal burnout rate in the raceway improve. Within the range of the research parameters, the suitable insertion depth is 310 mm at both 5° and 7°, achieving a burnout rate of up to 76.76%. The influence of angle on the pulverized coal burnout rate is less significant than that of insertion depth. The research results are being applied to the injection industrial experiment, and the combustion state of the raceway is improving, along with a significant enhancement in the production index of the blast furnace.