变渣皮厚度条件下铜冷却壁变形

摘要

A thermal-mechanical coupling model of copper cooling stave with variable slag coating was founded based on the thermal elastic mechanics, and the influences of the gas temperature, the cooling system, the materials of insert bricks, and the properties of the slag on the stave life were analyzed from the view point of the deformation of stave body. The results show that the deformation of stave body increases linearly with the increase of gas temperature; the deformation of stave body decreases at first and then increases when the slag coating thickness increases, and the deformation of the stave body has the minimum when the slag coating thickness is 20 mm; the increase of water velocity has a significant influence on reducing deformation of stave body, while increase of cooling water temperature incurs conspicuous growth of deformation; the increase of the heat conductivity of cast-in bricks and the decrease of the thermal expansion coefficient of slag significantly reduce the deformation of stave body while the increase of the thermal expansion coefficient of cast-in bricks obviously enlarges the deformation of stave body.%根据热弹性力学理论,建立渣皮厚度可变的铜冷却壁热-力耦合应力场分布计算模型,从铜冷却壁在不同渣皮厚度条件下的变形情况这一角度分析煤气温度、冷却制度、镶砖材质和炉渣性质等多种因素对铜冷却壁寿命的影响规律.计算结果表明:冷却壁本体变形随煤气温度的升高而线性增加;随着渣皮厚度的增大,冷却壁本体的变形量先减小后增大,渣皮厚度约为20 mm时冷却壁本体变形最小;冷却水流速的增大对降低冷却壁变形量有显著作用,而冷却水温度的升高会使冷却壁本体的变形量显著增大;提升镶砖热导率可明显减小冷却壁本体变形,而增大镶砖热膨胀系数会明显增加壁体变形量;炉渣热膨胀系数越小,铜冷却壁本体变形越小.