板坯连铸二冷控制系统升级改造的研究

Study on upgrading of second cooling control system in slab continuous cast

阐述了对引进的奥钢联板坯连铸过程控制系统升级改造的必要性和可行性,并建立了连铸板坯凝固传热的二冷动态控制模型,分析了拉速和过热度等参数对铸坯生产过程的影响,在二冷水控制模型中引入中包温度与目标温度的偏差值作为流量修正的前馈控制,提高了二冷水流量对拉速变化的适应能力,有利于铸坯表面温度的均匀稳定和提高铸坯的质量。在此基础上,完成Windows操作系统下的二冷控制系统,并与离线状态下Alpha小型机运行结果进行对比,两者吻合良好。表明新模型在Windows操作系统下替代小型机进行二冷控制是可行的。

The present paper elaborates the necessity and feasibility of upgrading the process control and automation system in the slab continuous caster introduced from Voestalpine AG and analyzes the effect of such a few parameters as the drawing speed and the overheat extent on the processs of the slab production by the established secondary cooling dynamic control model in the continuous casting slab solidification heattransfer process. The deviation value of the tundish temperature and the target temperature are introduced in the secondary cooling water control model as the feedforward control of the flow revision and as the result the adaptability of the secondary cooling water flow to the change of the drawing speed is improved, thus contributing a great deal to the equality and consistency of the surface temperature of the slab as well as to the improvement in the quality of the slab. On the basis of the above mentioned effort development of the secondary cooling control system under the Windows operating system was accomplished and comparison was made beween the running results of the current system and that of small sized Alpha machine running under the off-line condition and they are in good agreement with each other. It shows that the new model can replace the secondary cooling control function of the small sized machine under the Windows operationg system.