摘要
开发的热传输模型充分考虑了由于气隙的存在而使得结晶器表面散热不均匀 ,处理了凝固前沿相变所产生的结晶潜热 ,并采用变热物性参数。数据表明 ,经模型计算得出的铸坯温度与现场测定的温度基本相符。以此热传输模型为基础 ,研究了方坯连铸机二冷水在线控制方法—目标表面温度控制法。它可以实现铸坯表面温度及坯壳厚度的实时监控。以首钢三炼钢厂连铸方坯为研究对象 ,分析了拉速和过热度等参数对铸坯表面温度和凝固状态的影响 ,讨论了当某个冷却段供水量产生波动的情况下 ,采用不同二冷水控制方法时 ,对后续冷却段温度变化的影响。仿真试验表明 ,该方法可针对不同的生产条件 ,考虑到各回路之间的关联 ,更有利于稳定铸坯温度 。
A new model with varied thermal-physical parameters in which the existence of airspace resulting in heterogeneous heat transfer and the latent heat of fusion at the solidification front was considered was developed.The results showed that the simulated temperature of the billet was well in agreement with the measured one.On-line control method to secondary cooling zone of continuous caster for square billet-target surface temperature control can realize the real-time control for surface temperature.Shell thickness of the billet was investigated based on the developed model.Aimed at the squre billet in continuous casting in the third metallugical plant of the capital steel group,the effects of drawing velocity and overheating on surface temperature and solidification of the billet were analyzed.The influences of different control methods on surface temperature of succeeding cooling loops were discussed for fluctuation of water supply of a certain cooling loop.By consideration of the mutual conjunction among different cooling loops and varied production conditions,simulated results showed that the model is better beneficial to the stabilization of the surface temperature and improvement of the billet quality.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2005年第2期92-95,共4页
Special Casting & Nonferrous Alloys
关键词
方坯
动态控制
热传输
二冷
Square Billet,Dynamic Control,Heat Transfer,Secondary Cooling
