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针对传统基于BP神经网络建立的连铸坯质量预测模型训练速度慢、适应能力弱、预测精度低等问题,本文提出一种基于极限学习机的连铸坯质量预测方法,对方大特钢60Si2Mn连铸坯中心疏松和中心偏析缺陷进行预测,并与BP和遗传算法优化BP神经网络预测模型的预测结果进行分析对比.结果表明:BP及GA-BP神经网络预测模型对连铸坯中心疏松和中心偏析缺陷的预测准确率分别为50%、57.5%、70%和72.5%;而基于极限学习机的连铸坯预测模型预测准确率更高,对连铸坯中心疏松和中心偏析缺陷的预测准确率分别为85%和82.5%,且该模型具有极快的运算时间,仅需0.1 s.该模型可对连铸坯质量进行迅速准确地分析,为连铸坯质量预测的在线应用提供了一种新的方法. 相似文献
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莱钢股份炼钢厂4#矩形坯连铸机通过采用S7-400系列PLC,应用钢坯位置跟踪分段配水技术,优化二冷水配水控制,改造火切机系统,实现连铸机系统的全自动控制,简化了操作步骤,提高了控制精度、设备稳定性、产品质量和产量,中型线H型钢年产稳定在104.7万t左右。 相似文献
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10 0 %CCratiowasimplementedatXiangtanIronandSteelCoLtdinJuly 1999,whichhas 2ba sicoxygenfurnacesand 3continuouscastingma chines,andcanproduce 1 5milliontonofsteelayear.Sincethen ,alotofstudieshavebeencarriedoutforimproving qualityofsteels ,in particulargrade 2 0carbo… 相似文献
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The continuous casting process is used for solidifying molten steel into semi-finished steel.The technology of secondary cooling is extremely important for output of the casting machine and billet quality.A dynamic water model was introduced,including solidification model in the secondary cooling,feedforward control strategy based on continuous temperature measurement in tundish,and feedback control strategy based on surface temperature measurement.The mathematical model of solidification process was developed according to the principle of solidification,and the solidification model was validated by measuring billet shell thickness through shooting nail and sulfur print.Primary water distribution was calculated by the solidification model according to procedure parameters,and it was adjusted by the other two control strategies online.The model was applied on some caster and billet quality was obviously improved,indicating that the dynamic water model is better than conventional ones. 相似文献
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主要介绍攀钢2#连铸机二级过程计算机系统中的一个重要模型———LPC模型,它在连铸生产过程中实时计算板坯的温度分布情况,并完成板坯的切片跟踪,为轻压下提供温度参数,为二次冷却水的优化喷水提供温度参数。模型系统的应用,改善了铸坯内部质量,使连铸机能适应多类钢种的浇铸,提高了连铸机作业率,为实现高效连铸起到了重要作用。 相似文献
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本文介绍涟钢第一炼钢厂1号小方坯连铸机浇铸优质钢的生产实践,并探索连铸优质钢的途径。指出为保证质量,必须严格保证钢水质量,控制合适的浇铸温度,拉坯速度和冷却强度;钢水必须吹氩;采用大容量中间包和伸入式水口保护渣浇涛,确保连铸机的状况良好。 相似文献
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肖跃奇 《金属材料与冶金工程》2005,33(1):34-38
介绍了涟源钢铁集团有限公司第一炼钢厂2^#连铸机高效化改造的情况。通过对连铸机弧形半径、流间距、中间包、结晶器、二冷系统、振动装置、拉矫机、铸坯导向装置、引锭杆及其存放装置、给水系统、自动控制系统及部分辅助设施等的改造,提高了铸机的生产能力,改善了高拉速条件下小方坯的质量,取得了显著成效。 相似文献
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介绍了宣钢炼钢厂通过对LF钢包精炼炉,连铸机中间包流场、结晶器、二冷配水等重要工序进行技术改造和工艺优化,提高了铸坯质量,为开发生产品种钢提供了保证。 相似文献
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The effect of tundish wall inclination on the fluid flow and mixing: A modeling study 总被引:2,自引:0,他引:2
A mathematical model to represent turbulent fluid flow and mixing in continuous casting tundishes has been developed. The
model involves solution of the three-dimensional turbulent Navier-Stokes equation, turbulence being modeled by the so-calledK-ε, two-equation model. Fluid flow parameters and residence time distribution has been predicted in a tundish of rectangular
cross section. The model is later extended to predict fluid flow in typical industrial tundishes where walls are not vertical,
but rather slightly inclined from the vertical. This results in an interresting variation in fluid flow, which may have important
technological implications. The theoretical predictions are compared with measurements obtained in water models. The detailed
understanding of the hydrodynamics of the tundish flow can be used to optimize their design for steel cleanliness.
YOUDUO HE (on leave from Boutao Institute of Iron and Steel Technology, People's Republic of China) Research Associate 相似文献
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