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随着高炉喷吹煤比的增加 ,煤粉磨损风口的现象加剧 ,为合理确定喷煤枪的角度和枪嘴位置 ,采用数学模型预测高炉风口内煤粉颗粒运动轨迹。数学模型包括湍流流动模型、煤粉热解模型、挥发分和残碳燃烧模型、辐射模型和煤粉颗粒轨迹模型。模拟结果和实际情况相符 ,对于武钢 4号高炉 ,喷吹位置为 40 0 mm时 ,夹角应小于 1 1°,喷吹位置为 60 0 mm时 ,夹角应小于 9°。大颗粒煤粉由于惯性强 ,应尽量减少其比例。
With the increase of blowing coal ratio in blast furnace, the phenomenon of pulverized coal wear is aggravated. In order to reasonably determine the angle of gun and nozzle position, the mathematical model is used to predict the trajectory of pulverized coal particles in blast furnace tuyere. Mathematical models include turbulent flow model, pulverized coal pyrolysis model, volatile and residual carbon combustion model, radiation model and pulverized coal particle trajectory model. The simulation results are consistent with the actual situation. For the blast furnace at No.4 blast furnace, the included angle should be less than 11 ° at the blowing position of 40 mm and the angle should be less than 9 ° at the blowing position of 60 mm. Large particles of coal due to strong inertia, should minimize its proportion.