为了解废钢的熔化速度和熔化机理,在250 kg感应炉中进行了热模拟试验.测量熔化速度采用直径为?20~?50 mm的Q235圆钢,熔池温度为1300、1400和1600℃.根据试棒直径不同确定在熔池中浸泡时间.根据钢棒浸泡前后的质量和尺寸差别,计算出熔池为1300、1400和1600℃时,其质量熔化速度分别为1.8~4.0、3.5~6.5和12.6 g/s;径向熔化速度为0.012~0.026、0.035~0.045和0.060 mm/s.熔池液体与试棒之间的对流换热系数在1400℃时为32931 W/(m2·℃),1600℃时为32884 W/(m2·℃).在温度为1300℃时,碳在液体与试棒之间的对流传质系数为6.3×10-5 m/s,温度为1400℃时为6.4×10-5 m/s.热模拟试验所测得的钢棒熔化速度、液-固相之间的对流换热系数、碳的对流传质系数都与国外冶金工作者的试验结果相近,可以作为炼钢生产中计算废钢熔化的基础数据.
In order to find out the melting speed and mechanism of scrap melting,thermal simulation experiments were carried out in 250 kg induction furnace. Steel bars with diameter from 20 mm to 50 mm were adopted for measuring the melting speed with bath temperature of 1300,1400 and 1600℃. Soaking times were determined by the diameter of steel bars. According to the difference of weight and diameter of steel bars before and after soaking in steel bath,the mass melting rates are1.8-4.0,3.5-6.5 and 12.6 g/s,respectively. The radial meting rate are 0.012-0.026,0.035-0.045 and 0.06 mm/s at the temperature 1300,1400 and 1600℃,respectively. Convective heat transfer coefficient between the bath and the test bars at 1400℃is 32931 W/(m2·℃)and is 32884 W/(m2·℃)at 1600℃. Convective mass trans-fer coefficient of carbon is 6.3×10-5 m/s and 6.4×10-5 m/s at 1300℃and 1400℃. The measured steel bar melting speed,onvective heat transfer coefficient between bath and steel bars and convective mass transfer coefficient of carbon in the thermal simulation experiments are similar to the results of foreign metallurgical workers. These can be treated as the basic data for calculating the scrap melting in steelmaking.
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