连铸漏钢空间-时序特征与演化规律

漏钢是连铸生产的重大安全事故,准确认知漏钢在结晶器内的空间-时序特征及其演化规律,对连铸生产的稳定和顺行具有重要意义。基于获取的连铸漏钢可视化特征,从时间演化的角度,分析了典型黏结漏钢形成过程的主要特征;围绕热区域和冷区域的面积、温度速率和位置等瞬时空间特征,重点分析了真伪黏结漏钢的差异性和临界条件。结果表明,黏结漏钢热区域的面积主要集中在第1 973和7 795像素点之间,温度变化速率大于1.02℃/s是发生黏结漏钢的必要条件之一。冷区域的温度变化速率为-0.57~-4.22℃/s,当温度变化速率小于-2.52℃/s时,没有出现伪黏结漏钢现象,但却存在12例真黏结漏钢。真黏结漏钢的热区域位置主要集中在纵向的第46~64像素点,冷区域位置主要集中在纵向的第5~47像素点。研究结果可以为漏钢判定提供依据,有助于更加全面、准确地解析结晶器内铸坯表面的瞬时形态。

Space-time characteristics and evolution rules of breakout during continuous casting

Breakout is a serious accident during continuous casting. It is very important for the steady and smooth continuous casting if the space-time characteristics and its evolution rules of breakout in mould are accurately recognized. Based on the visual characteristics, the characteristics of typical sticker breakout were analyzed from the aspect of time evolution. The spatial characteristics of hot and cold regions, such as the area, temperature velocity and location, were studied and analyzed in order to obtain the difference and critical condition of true and false sticker breakouts. The results show that the hot region area of sticker breakout is mainly concentrated in 1 973 to 7 795 pixels. The temperature velocity greater than 1.02 ℃/s is the necessary condition for sticker breakout. The temperature velocity of the cold region is in the range -0.57 to -4.22 ℃/s. When the temperature velocity is less than -2.52 ℃/s, there is no false sticker breakout, but there are 12 cases of true sticker breakout. The gathering location of hot and cold region of true sticker breakouts is concentrated in the range 46th-64th and 5th-47th, respectively. The research provides an easy way to distinguish true and false sticker breakouts and is helpful to recognize the instantaneous morphology of slab surface in mould more fully and accurately.