40t钢包周转过程传热计算与分析

Calculation and Analysis of 4Ot Ladle Heat Transfer in Turnover Process

本文主要通过计算钢包周转节点,测量不同包龄规定位置钢包外壳或内膛的温度,来研究钢包周转过程中的传热。在倒罐—铁水预处理—转炉—氩站工艺路径下,钢包的平均周转时间为68.01 min。钢包外壳最高温度对应钢水出吹氩站调离小车节点,平均值为274.75℃。钢包外壳温度在低包龄阶段呈现上升趋势,平均升温速率0.22℃/min,随着包龄的增加,钢包外壳升温速率呈现下降趋势,包龄18炉时升温速率0℃/min,钢包耐材在18炉时达到热饱和。根据测温数据的平均值计算散热,满包阶段钢水平均温降为1.80℃/min,钢包散出的热量占钢水温降的91.69%,空包阶段1分钟散失的热量折合吨钢温降1.10℃,以包口散热为主,占比86.55%。

This paper mainly study the thermal behavior of the ladle in the turnover process by measuring and recording the temperature of the outer shell and inner chamber of a steel ladle at different position with different ladle ages.In DG-KR-BOF-CT process,the average ladel turnover time is 68.0l min.At the time of the molten steel out of the argon,the ladle shell reaches the highest temperature and the average value is 274.75C.The temperature of ladle shell shows an upward trend in the low ladle age stage,with an average heating rate of o.22C/min.With the increasing of ladle age,the heating rate of ladle shell shows a downward trend and the heating rate is O℃/min at the age of 18th,indicating that the ladle refractory reaches thermal saturation at this time.In the stage of full ladle,the average temperature decrease at the rate of 1.80℃/min,and the heat released from the ladle accounts for 91.69%of the temperature drop of the molten steel.In the stage of empty ladle,the heat lost in one minute equal to 1.10℃/t of the steel,which is the main heat dissipation of the ladle mouth,accounting for 86.55%.