绝热层对钢包热行为的影响

Effect of insulating layers on the thermal behavior of ladles

建立了基于有限元法的钢包二维传热模型,运用Ansys软件对钢包在不同绝热层厚度情况下的热状态及保温性能分别进行了模拟计算.有绝热层的钢包可以明显地提高自身的保温性能,且随着绝热层厚度的增加,保温效果愈加突显,但幅度越来越小.与无绝热层的钢包相比,在绝热层厚度达到20 mm时,钢包预热时间缩短约1 h,节约煤气消耗1000 m3,降低钢水温降约6℃.在热饱和阶段,钢包外壁温度平均降低了100℃,包壁散热减小,1h可以节能1255680kJ,折合标准煤43kg.最后利用现场实测数据进行了验证,结果表明模拟结果正确可信.

The thermal state and insulation capacity of ladles with different insulating layer thicknesses were simulated and calcu- lated by building a two-dimensional model of ladles based on the finite element method. A ladle with an insulating layer can effectively improve its thermal insulation. With the increasing of insulating layer thickness, the insulating effect becomes more prominent, but it grows slower. When the insulating layer thickness reaches 20 mm, the preheating time of the ladle is shortened by 1 h, the coal gas is saved by 1 000 m3 , and the steel temperature drop is decreased by 6 ℃ compared with a ladle without any insulating layer. During the heat saturating stage, the outside shell temperature of the ladle decreases by 100℃ , and the heat loss at the ladle shell falls down. Due to the insulating layer, the energy of 1 255 680 kJ could be saved per hour, which is equivalent to 43 kg standard coal. A comparison of the calculation results with measured data proves that the simulation results are reliable.