并罐式无钟炉顶布料蛇形偏料的研究

Research of snakelike deviation in the burden distribution of a parallel-hopper bell-less top

针对并罐式无钟炉顶的布料操作易产生蛇形偏料,形成不均匀的料面形状,导致料面透气性调节失控的问题,引入颗粒物质能量耗散系数计算方法,探讨颗粒蛇形下落的速度方向对颗粒在溜槽内的有效运动长度和溜槽出口处颗粒速度的影响.分析了并罐式炉顶布料产生炉喉料流轨迹落点差异,料面厚度不均匀的蛇形偏料原因.结果表明,料流密集点在溜槽上形成的碰撞轨迹并非是标准椭圆形状,而是两个不同长轴的半椭圆相接形成的碰撞轨迹,大椭圆的短轴等于小椭圆的长轴.

The calculation method of material energy dissipation coefficients was introduced to solve the problem of snakelike deviation in the burden distribution of a parallel-hopper bell-less top,which leads to an asymmetrical burden surface and the out-of-control of adjusting gas permeability in the burden layer.The effects of particle velocity direction on the effective length of falling movement in the chute and the particle velocity at the chute outlet were analyzed.Some reasons for snakelike deviation and the drop-point differences of charging trajectories were also discussed.It is concluded that the particle collide trajectory in the chute is not an ellipse shape but two semi-ellipses,and the long axis of the smaller semiellipse equals the short axis of the larger semiellipse.