高炉料流轨迹的数学模型

针对目前高炉料流轨迹计算的不足,本模型考虑了颗粒在空区下落过程中受重力、浮力及煤气曳力的作用,计算了炉料颗粒在溜槽和空区下落等阶段的运动轨迹.通过探讨不同炉料(焦炭、烧结矿、球团矿)在其粒径范围内的布料半径变化及煤气的曳力大小,分析了曳力对炉料落点的影响规律.结果表明:精确计算料流轨迹必须考虑煤气曳力的影响,不同密度、粒径及形状系数的颗粒在料面上落点各不相同,炉顶煤气流分布将影响高炉炉料的径向分布.

Mathematical model of burden trajectory in a blast furnace

Grain gravity, buoyancy and gas drag were taken into consideration in burden trajectory calculation and the movement trajectory of a particle in chute and freeboard was computed. The influencing laws of gas drag on the landing point were analyzed according to the discussion about the variation of charging radius with different burdens in their range of grain diameter and the percent of gas drag. It is shown that the effect of gas drag should be considered for the precise calculation of burden trajectory, the landing points of particles are not the same because of their different density, size and shape factor, and burden distribution is influenced by the distribution of top gas flow.