摘要
在高炉中,布料过程中的炉料运动行为和炉料分布直接影响高炉产能和能耗,而理解炉料的颗粒特性对炉料运动和炉料分布的影响至关重要,尤其是颗粒形状的影响。采用球形和非球形的离散单元法(Discrete Element Method, DEM)对4 000 m^(3)高炉的布料过程进行三维数值模拟,对比研究了不同颗粒形状模型对布料运动行为和单环及多环布料后的炉料分布的影响。结果表明在布料过程中,多面体炉料接触到溜槽后会比球形炉料损失更多的动量,导致落点更靠近炉心,而且多面体炉料的形貌分布、层间渗流、料层稳定性和孔隙率分布都不同于球形炉料。此外,研究发现球形炉料带适当的滚动摩擦能在布料速度和单环布料形貌上接近多面体的布料行为,但在多环炉料形貌和孔隙率分布等方面仍不适用。
In blast furnace(BF), the particles charging behavior and burden distribution in charging process directly affect furnace productivity and energy consumption, and it is essential to understand the influence of particles characteristics on charging behavior and burden distribution, especially the effect of particle shape. The spherical and non-spherical discrete element method(DEM) were used to simulate the charging process in 4 000 m^(3) BF top, the charging behavior and the burden distribution of single-ring and multi-ring charging with different particle shape models were comparatively studied. The results show that polyhedral particles lose more momentum than spherical particles when contacting the chute, resulting in the drop point of polyhedrons closer to the furnace center. Moreover, the burden topography, inter-layer percolation, packing stability and porosity distribution of polyhedral particles are different from those of spherical particles. In addition, it is found that spherical particle with proper rolling friction is close to charging behavior of polyhedron in terms of the falling velocity and burden distribution of single-ring charging, but it is not sufficient to account for burden distribution and porosity distribution of multi-ring charging.
作者
夏修浩
周连勇
马华庆
赵永志
XIA Xiuhao;ZHOU Lianyong;MA Huaqing;ZHAO Yongzhi(College of Energy Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2021年第12期1228-1236,共9页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(51741608)。
关键词
高炉
离散单元法
颗粒形状
炉料运动
炉料分布
blast furnace
discrete element method
particle shape
particles charging behavior
burden distribution
