基于流体力学的高炉冶炼强度对炉缸侧壁温度影响的实践与分析

Practice and Analysis of Effect of Blast Furnace Smelting Intensity on Hearth Sidewall Temperature Based on Fluid Dynamics

随着高炉向大型化发展,大型高炉的炉缸寿命已成为制约高炉寿命的关键因素,而高炉冶炼强度是影响炉缸寿命的重要因素。通过对高炉炉缸进行建模及采用数值模拟软件对大型高炉炉缸内1500℃铁水的流动进行模拟,并根据固液流动传热定律得到炉缸耐材热面的温度分布。分析了不同冶炼强度下耐材热面的最高温度和位置及其对耐材侵蚀的影响。结合宝钢3号高炉停炉破损调查及炉缸侧壁温度历史数据,提出了一种确定高炉适宜冶炼强度的定量分析方法,并提出了改进炉缸侧壁温度异常的措施。

With the development of blast furnaces towards large scale,the hearth life of large-scale blast furnaces has become a key factor restricting the life of blast furnaces,and the smelting intensity of blast furnaces is an important factor affecting the hearth life.The flow of hot metal at 1500℃in the hearth of large blast furnace was simulated by both modeling the blast furnace hearth and a numerical simulation software,and the temperature distribution on the hot side of refractory material for the hearth was obtained according to the law of solid-liquid flow heat transfer.The highest temperature and its position on the hot side of the refractory material under different smelting intensities,and its influence on the erosion of the refractory material were analyzed.According to the investigation on shutting down due to damage of Baosteel's blast furnace No.3 and its running data of temperature of hearth sidewall,a quantitative analysis method to determine the appropriate smelting strength of the blast furnace was proposed,and the measures to improve the abnormal temperature at hearth sidewall were proposed.