中小型转炉炉壳变形的数值模拟

Numberical simulation on deformation of a medium-sized converter shell

转炉炉壳温度升高是炉壳变形的主要原因,采用内衬石棉板隔热是降低中小型转炉炉壳温度、减轻炉壳蠕变变形的经济有效措施之一.模拟计算了某钢厂80t转炉炉壳温度场以及不同温度条件下炉壳热应力与石棉板厚度之间的关系,计算温度值与现场实测值基本吻合.当石棉板厚度为30mm左右时,炉壳温度可以控制在360℃以下;低于炉壳材质的蠕变温度,炉壳所受到的热膨胀应力仅为没加石棉板时的50%.

The main cause of deformation of a converter shell is temperature rising of the converter shell, a economical and effective method to reduce the temperature and creep deformation is adopting a heat insulation layer of asbestos board. The temperature field and thermal stress of shells with different thicknesses of asbestos board at different temperatures were obtained for an 80 t converter at Chongsteel in China by heat transfer mathematical modeling. The calculated temperatures were in conformity with the measured data. When the thickness of asbestos board reaches 30 mm, the shell temperature could be controlled below 360 ℃, which is lower than the creep temperature of the shell material, and the thermal expansion stress of the shell is only 50 96 of that without asbestos board.