狭缝对透气砖热应力影响的模拟研究

对透气砖吹氩时热应力模拟计算,探索狭缝对透气砖热应力影响,寻求合理的狭缝布置提高透气砖使用寿命.首先,在保持固定的狭缝尺寸与位置的前提下建立径向与切向两种狭缝布置形式钢包透气砖物理模型,然后设置合适的边界条件,计算在吹氩时两种模型整体应力及轴向不同位置路径热应力分布.研究发现:两种狭缝形式的透气砖在工作面附近都有明显应力梯度；狭缝径向布置与切向布置时轴中心区域在相同路径上应力最大值比较,前者是后者的3到6倍；切向狭缝截面中心呈现较低应力,狭缝至截面边缘的区域应力较高,而狭缝径向布置时截面上狭缝之间的位置呈现出一个应力较高的环形区域.

Simulation Study of Slits Impact on Purging Plugs Thermo-mechanical Stress

To investigate the impact of silts purging plugs thermo-mechanical stress and search reasonable arrangement of the slits for improving the plugs’ life,the thermal-mechanical stress of the purging plug was computed in this paper.Firstly,radial and tangential slits arranged ladle purging plugs’ physical models were established while the slits’ size and position were not changed.Then,suitable boundary conditions were set and overall stress and equivalent stress of different paths from bottom to the working face were computed.The result shows that there is obvious stress gradient in the axial direction near the working face in both models;in the same path of central area of each model,the maximum stress of the former model is three to six times bigger than that of the latter;in the former model there is lower stress in the central area than the stress of the area from slits to the edge in the same cross section while the latter model presents a circular area with higher stress near the slits.