不同溜槽形状下的料流偏析现象

Segregation of material flow under different chute shapes

无钟炉顶设备主要通过改变溜槽倾角以调整布料矩阵,最终改变炉料在高炉内的分布。此外,炉料分布还受溜槽形状的影响,不同形状的溜槽,其料面偏析情况不同。为探究不同溜槽下的布料偏析现象,针对常见圆方比例不同的3种类型溜槽、带储料槽型溜槽以及破损溜槽,运用离散单元法对溜槽表面和布料特征进行研究,探究在不同溜槽下炉料的偏析现象和溜槽受力情况。模拟结果表明,相对于圆形出口溜槽,方形出口溜槽料流宽度小,分布均匀,更有利于精准布料;带储料槽溜槽可以减小炉料对溜槽的冲刷,延长溜槽寿命;破损溜槽料流宽度较大,炉料分布不均匀,会加大炉料在料面上的偏析。

The bell-free furnace top equipment mainly adjusts the distribution matrix by changing the inclination of the chute,and finally changes the distribution of the charge in the blast furnace.In addition,the charge distribution is also affected by the shape of the chute,and the chute of different shapes cause different material surface segregation.The segregation phenomenon of cloth under different chute is explored,and three types of chutes with different square proportions,storage chute,and broken chute are used,and the coke model is established using the discrete element method.The discrete element method is used to study the surface and burden distribution characteristics of the chute,and to investigate the segregation phenomenon and the stress of the chute of the charge under different chutes.The simulation results show that,compared with the circular exit chute,the square exit chute has a small width and uniform distribution,which is more conducive to accurate distribution.The storage chute can reduce the erosion of the chute in charging material progress and extend the chute life;the flow width of the broken chute is large,the burden distribution is uneven,and the segregation of the material surface is increased.