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针对炼钢厂炼钢至连铸全流程,建立了钢包热循环过程钢包热状态跟踪模型,并将包衬温度实测和数值模拟相结合,利用传热反问题修正模型,提高模型的准确度.利用钢包热状态跟踪模型分析了新砌钢包烘烤预热时间、空包时间、离线烘烤时间和包衬侵蚀等因素对钢水温度的影响规律.结果表明:新砌钢包烘烤预热时间从480min增加到780min,可使新包第一次热循环中钢水总温降减少15.6℃;空包时间为540min时,钢水温降比正常周转包增加14.6℃;空包时间越长,离线烘烤减少钢水温降的效果越明显;当空包时间为540min时,进行240min离线烘烤,可使钢水总温降减少11.0℃;包衬侵蚀可使钢水总温降最大增加9.3℃.
Aiming at the whole process of steel-making to continuous casting in steelworks, a ladle thermal state tracking model of ladle heat cycle process was established. Combining actual measured temperature with numerical simulation, the heat transfer inverse problem was used to correct the model and improve the accuracy of the model. The effect of preheating time, emptying time, off-line baking time and lining erosion on the temperature of molten steel was analyzed by using the ladle thermal state tracking model.The results showed that the preheating time of new ladle was from 480min increase to 780min, the total temperature drop of molten steel in the first heat cycle can be reduced by 15.6 ℃. When the emptying time is 540min, the temperature drop of molten steel increases by 14.6 ℃ compared with the normal turning rate. The effect of roasting to reduce the temperature drop of molten steel is more obvious. When the emptying time is 540 min, the total temperature drop of molten steel decreases by 11.0 ℃ for 240 min, and the total temperature drop of molten steel increases by 9.3 ℃.