7号连铸机的NKK液位PID控制参数及结晶器流场优化

本钢三连铸的单流宽板坯连铸机从达涅利公司引进,于2008年12月4日建成投产,结晶器液位控制采用NKK技术。介绍了7号连铸机生产超低碳钢过程中,结晶器液位出现不稳定性波浪的原因,并通过改进NKK液位控制工艺,微调PID控制参数,以及优化结晶器流场等措施,提高了宽幅汽车板生产时的结晶器液位控制精度,并且解决和消除了不稳定型波浪的问题,使宽幅汽车板的轧制成材率大幅提升。

NKK level PID parameters tuning and mould flow mode optimization for slab caster No.7

The single line slab caster of Benxi Steel is introduced from Danieli company, which is established on the December 4th of 2008. The mould level is controlled by NKK. The reasons for mould level unstable waves during casting ULC steel grades are introduced during the production of ultra-low carbon steel by No.7 continuous casting machine, and the mould level control accuracy is increased by some measures, such as improving NKK level process and tuning its control PID parameters and optimizing mould flow mode. After that, mould level control accuracy for wide automobile plate production and its coil final quality are increased. The problems of random travelling waves are solved and eliminated, and the rolling yield of wide width automobile plate is greatly increased.