【摘要】 球团矿离开料斗时的颗粒偏析会影响其在气基竖炉内的分布，分布不合理将影响还原气的利用率.建立20°～70°倾角的料斗、导料管、溜槽、气基竖炉三维模型，基于离散元法研究物料从料斗到气基竖炉布料过程中的流动和分布.结果表明：排料时，20°～25°倾角的料斗内炉料流型均为整体流，30°～55°倾角的料斗内炉料流型均为混合流，60°～70°倾角的料斗内炉料流型均为漏斗流；漏斗流促使料层形成快速流动的中心通道，大颗粒会更早地离开料斗进入炉内，在落点区域堆积，导致料斗内大颗粒负偏析、竖炉内落点区域大颗粒正偏析；20°～35°倾角的料斗布料后，炉内孔隙率偏差分布在0.003 83～0.004 68,倾角增大，孔隙率偏差增大；改变炉料-料斗静摩擦系数、炉料批重、料斗半径等参数，发现料斗倾角是影响布料过程和结果的主要因素，孔隙率偏差仍随料斗倾角的增大而增大.更多还原

【Abstract】 Particle segregation of pellets leaving the hopper affects their distribution in the gas-based shaft furnace, which could also affect the utilization of reducing gas if not properly distributed. In this study, the three-dimensional models of hopper with an inclination angle of 20°～70°, guide pipe, chute and gas-based shaft furnace were established. Based on the discrete element method, the flow and distribution of pellet from hopper to gas-based shaft furnace were studied. The results show that particles appear with mass flow in the hopper at 20°～25°, mixed flow in the hopper at 30°～55°and funnel flow in the hopper at 60°～70° during the discharging process. The funnel flow promotes the formation of a fast-flowing central channel in the material layer, and large particles leave the hopper to enter the furnace earlier and accumulate in the drop point area, resulting in negative segregation of large particles in the hopper and positive segregation of large particles in the drop point area in the shaft furnace. The deviation of porosity in the furnace is distributed between 0.003 83 and 0.004 68 when the hopper inclination is 20°～35°, and the deviation of porosity increases when the inclination angle increases. By changing the charge-hopper static friction coefficient, charge batch weight, and hopper radius, it is found that the hopper inclination angle is the main factor affecting the distribution process and results, and the porosity deviation still increases with the increase of the hopper inclination angle.更多还原