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连铸DYNACS动态二冷水模型 总被引:2,自引:0,他引:2
DYNACS动态二冷水模型是目前最先进的动态二冷水模型,它通过过程数据的跟踪,铸流温度场的模拟及积分计算,动态调整二冷水量,达到最优的铸坯表面温度控制. 相似文献
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在坯龄模型基础上,根据计算出的铸坯表面温度与目标温度的差值进行优化调节水量。设计了宣钢150t1#方坯连铸机二冷动态配水模型,实现了铸坯表面温度自适应控制。该模型使二次冷却更加均匀,减少了铸坯表面回温,以便达到控制铸坯组织和内部质量的目的。 相似文献
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薄腹板异形坯更体现了近终形的特点。采用有限元数值模拟计算了薄腹板异形坯连铸温度场,分析了不同拉速、比水量对连铸过程温度、坯壳厚度和液芯长度的影响。结果表明:异形坯不同位置的温度和坯壳厚度不均匀,当异形坯腹板较薄时,腹板处凝固传热较慢,腹板处和R角处坯壳最薄弱,比翼缘边部薄约4mm;拉速每提高0.1m/s,异形坯出结晶器时的表面温度会提高约80~100℃,坯壳厚度会减薄0.8~1.2mm,液芯长度增加1.2~1.6m;比水量每提高0.05L/kg,异形坯出二冷段时的表面温度会降低约8~16℃,液芯长度缩小0.13m。 相似文献
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针对连铸生产过程中的二冷配水问题,建立了铸坯的凝固传热数学模型。通过实时模拟计算铸坯的温度场,并与PID控制技术相结合,开发了在线二冷控制模型。模型能自动根据钢种、铸坯规格及工艺参数的变化动态调整二冷控制水量,将铸坯的表面温度控制在工艺目标值附近。通过设计合理的控制系统架构,确保了二冷控制系统的稳定性及可靠性。在线测温结果表明,模型具有很高的计算精度。当拉速、浇注钢水过热度变化时,模型能快速将水量调整到目标值,速度快且超调小,从而确保铸坯的表面温度跟踪误差始终限制在较小范围内;当浇注过程处于相对稳态时,铸坯的表面温度保持在目标值。目前,模型已经应用于宝钢内外的多台连铸机,应用效果良好。 相似文献
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《钢铁冶炼》2013,40(5):377-386
AbstractA two-dimensional heat transfer model was developed for the secondary cooling system during beam blank continuous casting. The finite element method was used to calculate the heat transfer. Accurate cooling boundary conditions in the secondary cooling zone are involved, including spray water cooling, water evaporation cooling, radiation cooling and roll contact cooling in the casting direction and non-uniform distribution of spray water flow density in the cross-section. The causes of longitudinal crack at the fillet during Q235 steel continuous casting were analysed on the basis of the simulation of the developed model, and then the spray water flow and the transverse nozzle layout were optimised. Practical results show that the surface quality of the beam blank improved after optimisations. Numerical results from the present model were validated using previous experimental measurements, which show good agreement. 相似文献
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结合连铸坯凝固理论和异型坯在结晶器内以及二冷段所受的应力,分析了异型坯这种独特断面铸坯表面裂纹和内部裂纹的形成机理。根据机理分析对异型坯的冷却制度和保护渣理化性能进行适当优化。通过降低结晶器和二冷段的冷却水量,增大结晶器保护渣粘度等措施,减少了异型坯裂纹的产生。 相似文献
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对Φ380mm高碳钢球钢连铸圆坯轧成钢材出现的表面裂纹进行了统计分析结果表明:抛丸检查后的连铸圆坯表面存在纵向裂纹,主要原因是钢液在结晶器中凝固时冷却不均产生的。通过将结晶器铜管锥度由0.45%/m调整为0.63%/m,1300℃保护渣粘度由0.60 Pa·s降到0.50 Pa·s,1300℃保护渣熔速由36s调整到49s,二冷比水量由0.30L/kg降到0.25L/kg,二冷段四面冷却改为八面冷却等措施,有效降低了大规格钢球钢铸坯及轧材的表面纵裂纹,轧材表面探伤合格率提高到95%以上。 相似文献
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The temperature field and cooling rate especially for surface center and corner, which located at 0-5mm under the slab surface were calculated along the casting direction based on the two- dimensional heat transfer and solidification model of slab continuous casting, combined with the actual casting process conditions. The results show that the temperature of slab drops rapidly from liquidus temperature to 1200-900?? in the mold, and then drops slowly in the secondary cooling zone with the corner 200?? about lower than the surface center. As to the cooling rate, for 0-5mm layer under surface, it is up to 40??/s in the mold with the average cooling rate about 10??/s. For the secondary cooling zone, it is about 3-6??/s in the foot zone, and then drops to a steady value about 0. 1-0. 5??/s. The results can be used to optimize the continuous casting process and provide the basis for the control of the surface and corner transverse cracking of continuous casting slabs based on the solidification and phase transformation principles. 相似文献