基于表面温度测量的连铸二冷动态控制模型
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摘要
二冷动态控制以连铸坯温度的稳定控制为目标,对提高连铸坯质量的稳定性具有重要意义。二冷动态控制的核心内容是实现铸坯表面温度的闭环控制,其关键是实现基于在线凝固传热模型的温度反馈,模型的准确性则是保证二冷动态控制应用效果的基础。为此,提出一种基于表面温度测量,结合射钉修正凝固传热模型的方法,用于辨识凝固传热模型的参数以保证模型的准确性,并应用于二冷动态控制。特别对随机氧化铁皮干扰下的铸坯表面温度的测量方法进行了深入的研究,并开发了能够长期稳定运行于连铸现场的测温装置。
Dynamic secondary cooling aims at the stable temperature control of continuous casting billets, which is of great significance for improving the quality stability. The core content for dynamic secondary cooling control is to realize the close-loop control of surface temperature of continuous casting billets, as the key is to realize the temperature feedback based on the online solidification and heat transfer model; furthermore, the accuracy of the model is the basis for ensuring the application effect of the dynamic secondary cooling control. Therefore, a method was proposed for calibrating the solidification and heat transfer model, based on surface temperature measurement combined with nail-shooting, and used to identify the parameters of the solidification and heat transfer model to ensure the accuracy of the model. In particular, a deep study was carried out on the measurement method of the surface temperature of continuous casting billets under the interference of random scale, and a temperature measuring device was developed which can stably operate in site in the continuous casting process for a long time.
Dynamic secondary cooling aims at the stable temperature control of continuous casting billets, which is of great significance for improving the quality stability. The core content for dynamic secondary cooling control is to realize the close-loop control of surface temperature of continuous casting billets, as the key is to realize the temperature feedback based on the online solidification and heat transfer model; furthermore, the accuracy of the model is the basis for ensuring the application effect of the dynamic secondary cooling control. Therefore, a method was proposed for calibrating the solidification and heat transfer model, based on surface temperature measurement combined with nail-shooting, and used to identify the parameters of the solidification and heat transfer model to ensure the accuracy of the model. In particular, a deep study was carried out on the measurement method of the surface temperature of continuous casting billets under the interference of random scale, and a temperature measuring device was developed which can stably operate in site in the continuous casting process for a long time.
引文
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[17] 张育中,胡振伟,孟红记,等.渐晕对面阵CCD高温计精度的影响及校正方法[J].东北大学学报:自然科学版,2014,35(5):609.(Zhang Y Z,Hu Z W,Meng H J,et al.Vignetting influence on accuracy of temperature measurement for CCD-based pyrometer and correction method[J].Journal of Northeastern University:Natural Science,2014,35(5):609.)
[18] Xie Z,Zhang Y Z,Hu Z W,et al.Vignetting calibration and temperature correction for casting billets [J].Review of Scientific Instruments,2013,84(9):601.
[19] Zhang Y Z,Xie Z,Hu Z W,et al.Online surface temperature measurement of billets in secondary cooling zone end-piece based on data fusion [J].IEEE Transaction on Instrumentation and Measurement,2014,63(3):612.
[20] 张克强,林宪,高海,等.方坯连铸二级配水技术研究[J].钢铁,2006,41(1):39.(Zhang K Q,Lin X,Gao H,et al.Application of level 2 distribution of spraying water in continuous casting[J].Iron and Steel,2006,41(1):39.)
[2] Chaudhuri S,Singh R K,Patwari K,et al.Design and implementation of an automated secondary cooling system for the continuous casting of billets[J].ISA Transactions,2010,49(1):121.
[3] 陈志凌,张国贤,韩传基.连铸二次冷却智能优化控制的研究[J].钢铁,2006,41(9):39.(Cheng Z L,Zhang G X,Han C J.Research on intelligent control of secondary cooling of continuous casting[J].Iron and Steel,2006,41(9):39.)
[4] Petrus B,Zheng K,Zhou X,Thomas B G,et al.Real-time,model-based spray-cooling control system for steel continuous casting[J].Metallurgical and Material Transactions,2011,42B(1):87.
[5] Spitzer K H,Harste K,Weber B,et al.Mathematical model for thermal tracking and on-line control in continuous casting[J].ISIJ International,1992,32(7):848.
[6] Mizikar E A.Mathematical heat transfer model for solidification of continuously cast steel slabs[J].Transactions of the Metallurgical Society of AIME,1967,239:1747.
[7] Louhenkilpi S,Laitinen E,Nieminen R.Real-time simulation of heat transfer in continuous casting[J].Metallurgical and Material Transactions,1993,24B(4):685.
[8] Hardin R A,Liu K,Kapoor A,et al.A transient simulation and dynamic spray cooling control model for continuous steel casting[J].Metallurgical and Material Transactions,2003,34B(3):297.
[9] Yang J,Xie Z,Ji Z P,et al.Real-time heat transfer model based on variable non-uniform grid for dynamic control of continuous casting billets[J].ISIJ International,2014,54(2):328.
[10] Ma J C,Xie Z,Jia G L.Applying of real-time heat transfer and solidification model on the dynamic control system of billet continuous casting[J].ISIJ International,2008,48(12):1722.
[11] Louhenkilpi S,Laitinen E,Nieminen R.Real-time simulation of heat transfer in continuous casting[J].Metallurgical Transactions,1993,24B(4):685.
[12] 孙海波,李烈军,程晓文,等.连铸凝固传热时液相有效导热系数的定量化[J].钢铁研究学报,2015,27(5):35.(Sun H B,Li L J,Chen X W,et al.Quantification for effective thermal conductivity coefficient of melt during solidification and heat transformation of continuous casting[J].Journal of Iron and Steel Research,2015,27(5):35.)
[13] Xie Z,Yang J.Calculation of solidification-related thermophysical properties of steels based on Fe-C pseudobinary phase diagram[J].Steel Research International,2015,86(7):766.
[14] Yang J,Xie Z,Meng H J,et al.Multiple time steps optimization for real-time heat transfer model of continuous casting billets[J].International Journal of Heat and Mass Transfer,2014,76:492.
[15] 孟红记,郑鹏,梅国晖,等.基于混沌序列的粒子群优化算法[J].控制与决策,2006,21(3):263.(Meng H J,Zheng P,Mei G H,et al.Particle swarm optimization algorithm based on chaotic series[J].Control and Decision,2006,21(3):263.)
[16] 白海城,张育中,胡振伟,等.铸坯表面温度场测量仪的研究[J].仪器仪表学报,2012:33(6):1392.(Bai H C,Zhang Y Z,Hu Z W,et al.Research on the measuring instrument for surface temperature field of casting billet[J].Chinese Journal of Scientific Instrument,2012,33(6):1392.)
[17] 张育中,胡振伟,孟红记,等.渐晕对面阵CCD高温计精度的影响及校正方法[J].东北大学学报:自然科学版,2014,35(5):609.(Zhang Y Z,Hu Z W,Meng H J,et al.Vignetting influence on accuracy of temperature measurement for CCD-based pyrometer and correction method[J].Journal of Northeastern University:Natural Science,2014,35(5):609.)
[18] Xie Z,Zhang Y Z,Hu Z W,et al.Vignetting calibration and temperature correction for casting billets [J].Review of Scientific Instruments,2013,84(9):601.
[19] Zhang Y Z,Xie Z,Hu Z W,et al.Online surface temperature measurement of billets in secondary cooling zone end-piece based on data fusion [J].IEEE Transaction on Instrumentation and Measurement,2014,63(3):612.
[20] 张克强,林宪,高海,等.方坯连铸二级配水技术研究[J].钢铁,2006,41(1):39.(Zhang K Q,Lin X,Gao H,et al.Application of level 2 distribution of spraying water in continuous casting[J].Iron and Steel,2006,41(1):39.)