共查询到19条相似文献,搜索用时 187 毫秒
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依据唐山贝氏体钢连铸机的具体条件,建立了方坯连铸二冷喷淋系统的变比水量控制模型,实现了随铸坯钢种、断面尺寸及拉速变化对各回路水量连续实时控制.不仅方便现场工艺工程师进行参数调整,也稳定了铸坯表面的温度,从而改善了铸坯表面质量和内部质量.经现场应用表明,利用变比水量配水模型所制定的二冷配水制度是合理的,得到的铸坯质量良好. 相似文献
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根据奥氏体不锈钢的热物理参数和二冷区各区出口目标温度,建立了不锈钢220mm×220 mm铸坯动态二冷综合控制模型和末端拉速电磁搅拌-拉速优化模型。304奥氏体不锈钢连铸生产应用结果表明,在该钢正常工作拉速0.8~1.1 m/min,根据目标温度(足辊1080℃,一区1 070℃,二区1060℃,三区1045℃,进拉矫机980℃)制定相应比水量(0.30~0.33 L/kg),模型实时计算表面温度与目标温度对比,进行在线控制,铸坯温度均匀、稳定,冶金质量良好。 相似文献
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本文从无缝钢管坯高质量要求,对管坯连铸工艺进行研究。重点阐述连铸工艺参数控制及其技术措施;连铸钢水喷Ca-Si粉处理的效果;分析浇注温度、拉速和二次冷却对管坯低倍质量的影响,确定合理的浇注参数,二冷区采用FD雾化型喷嘴,拟定比水量和二冷长度方向的水量分配,确立注温与拉速、拉速与二冷水量的匹配;在全保护浇注条件下,使连铸管坯质量得到改善、轧管品种规格扩大、轧管成材率稳定上升,达到接近轧坯轧管的水平,连铸管坯取代轧坯轧管比达91%,经济效益显著。 相似文献
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55SiMnVB钢方坯连铸二冷区凝固的最佳工艺制度控制模型 总被引:5,自引:1,他引:4
本文应用所建立的铸坯凝固传热数学模型,针对二冷区喷水段各部分的不同传热方式,采取分部位确定边界条件,根据铸坯质量的冶金要求,对断面为140×140 mm的55SiMnVB方坯进行模拟计算,获得了一定浇注温度下二冷区的最佳水量分布与最佳拉速的关系式 W_i=α+bv+cv~2以及在一定水量分布条件下的浇注温度与最大拉速的关系式 t_j=d+ev这些关系式可作为合金钢(55SiMnVB)方坯连铸二次冷却的最佳工艺制度控制模型。 相似文献
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150 mm×150 mm方坯连铸高效化的二冷技术 总被引:3,自引:0,他引:3
根据连铸坯二冷均匀冷却的构想,重新设计并优化二冷喷淋结构和喷嘴的布置,增加了一个二冷喷啉段.提出二冷段各段水量Qi(L/min)与钢液过热度ΔT(℃)和拉速V(m/min)关系的新的二冷水模型Qi=a+bv+cv2+d(ΔT-30)+F,其中a、b、c、d和F为常数.实践证明,通过使用优化后的二冷结构和模型,150 mm×150 mm连铸坯断面的最高拉速达3.8~4.0 m/min,Q235和HRB335钢连铸坯的质量明显改善,疏松、偏析、裂纹等低倍组织≤2级,废品率降低0.23个百分点,钢坯平均日产量由8.0万t提高至9.4万t,生产率提高约17.5%. 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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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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Zhichao Dou Qing Liu Bao Wang Xiaofeng Zhang Jianfeng Zhang Zhigang Hu 《国际钢铁研究》2011,82(10):1220-1227
Secondary cooling control is an important factor in the continuous steel casting process. This paper reviews popular control models and analyzes their principles and characteristics. On the basis of the review, this paper proposes a new concept called “effective‐superheat” and a new control model called “synthetical model dynamic control method based on online temperature measurement.” The model, which combines the advantages of the popular models reviewed, not only allows steady, accurate and dynamic control of slab surface temperature, but also provides the temperature profile and the end of the liquid pool. In addition, this paper also discusses the current problems with secondary cooling control and the related development trends, which may be helpful for further development of secondary cooling control technology and informationization of the continuous casting process. 相似文献
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In this paper, a compensation control model of secondary cooling process of billet continuous casting for quality steel has been presented. The effects on the spray control of the various parameters such as steel superheat, casting speed, cooling water temperature and chemical component of steel were considered. The parameters of control model were determined to associate with the two‐dimensional heat transfer equation and solved by finite‐difference method. Effects of steel superheat and cooling water temperature on surface temperature, solidification structure and solidifying end point were discussed. Results indicate that steel superheat significantly affects solidification structure and solidifying end point but has a little effect on slab surface temperature. Moreover, secondary cooling water temperature affects surface temperature and solidifying end point but has a little effect on solidification structure. The surface temperature and solidifying end point can be maintain stabilized through applying the compensation control model when steel superheat and cooling water temperature vary. The models have been validated by industrial measurements. The results show that the simulations are in very good agreement with the real casting situation. 相似文献
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转炉静态控制是转炉计算机的基本控制方式,副枪动态控制是以静态控制为基础。转炉炼钢采用静态模型(终点控制模型、供氧模型、造渣模型、底吹模型)和动态模型(脱碳速度模型、钢水升温模型和冷却剂加入量模型)可减少炉口压力偏差,提高煤气回收量。 相似文献
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