多功能铁水包加盖保温效果分析

Analysis on heat preservation of multifunctional hot metal ladle

为了减小运输过程中铁水温降以及降低钢铁生产成本,对铁水包加盖的综合保温效果进行了定量分析。通过建立相应数学模型和数值计算,分别对加盖和不加盖的230 t铁水包进行5 h的空包运输过程模拟,以及加盖和不加盖的满包铁水包1 h模拟。模拟结果显示,在5 h空包运输阶段加盖,能有效改善接铁前的空包热状态,减少下次接铁时铁包耐材所需的蓄热量,且铁包上部包沿处温度提高最大为194 K,上下部温差减小140 K,降低热应力所导致的耐材损坏;在1 h满包运输阶段,全程周转增设保温盖能减小铁水温降约13 K。最后,将模拟试验结果与现场实测数据结果进行分析比较,相对误差值小于5%,验证了模型的准确性。

In order toreduce the temperature drop of molten ironand thecost of production during molten iron transporta- tion, the comprehensive insulation effect of ladle with lid was analyzed quantitatively. In the condition with or without lid, the simulations of unloaded ladle towards the ladle with 230 t of molten iron in 5 h and loaded ladle in 1 h were car- ried out via mathematical model and numerical calculation. The result showed that transportation of unloaded ladle for 5 h, the insulation lid couldincrease the overall temperature of inner ladlewall , increase by 194 K at most on the edge of ladle, and meanwhile reduce the temperature difference between to pand bottom （ 140 K）.The insulation lid couldimprovethe heat condition of unloaded ladle before the ladle picked up molten iron and reduce the heat storage the ladle refractory required when the ladle picked up the molten iron. In the 1 h transportation of loaded ladle, the insula- tion lid couldeffectively reduce the thermal heat dissipation and thus decrease the temperature drop of molten iron about 13 K. Finally, the simulation experiment result and the field measured data were comparatively analyzed. The relative error was less than 5%, which demonstrated the accuracyof the model.