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利用三维离散元法建立了无钟高炉布料模型,分析了料罐、旋转溜槽中的颗粒流动行为以及颗粒离开溜槽后的下落轨迹和料堆形成,可视化再现了装料过程.结果发现:炉料在流动过程中始终存在粒度偏析,料罐排料流为漏斗流,小颗粒由于偏析而倾向于后期排出;溜槽倾角对颗粒流动行为和料堆形成影响较大;溜槽内颗粒流由于溜槽旋转而向侧上部偏离和翻动,小颗粒因靠近壁面而位于料流内侧,大颗粒因聚集在溜槽上部而处在料流外侧,炉料颗粒偏析、偏转翻动和速度分布影响下落轨迹;在炉料下落到料面的堆积过程中,大颗粒易于向炉喉中心和边缘偏析,小颗粒因位于料流内侧和渗透作用而分布在堆尖下方且偏向中心侧.结合激光网格炉内测量技术料流轨迹测量结果,验证了模型的适用性.
The three-dimensional discrete element method was used to establish the model of the bell-less blast furnace. The particle flow behavior in the tank and the rotating chute was analyzed, and the falling trajectory and the material pile formation after the particles left the chute were analyzed. The charging process was visualized and the charging process was found. Particle size segregation always exists in the flow process, and the discharge flow of the material tank is a funnel flow. Small particles tend to be discharged later due to segregation. The chute inclination has a great influence on the particle flow behavior and the formation of the material pile. The particle flow in the chute is caused by the rotation of the chute The upper part deviates and flirts, the small particles are located inside the stream due to being close to the wall surface, and the large particles are located outside the stream due to the accumulation in the upper part of the chute. The segregation of the charge particles, deflection flipping and speed distribution influence the falling trajectory; when the charge falls to the material surface In the process of accumulation, large particles tend to segregate to the center and edge of the throat, and the small particles are distributed below the pile tip and on the central side due to the infiltration inside the stream. Combining with the laser grid measuring technology, , Verify the applicability of the model.