共查询到17条相似文献,搜索用时 156 毫秒
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为了提高莱钢1500mm热连轧卷取温度的控制精度,对原基础自动化控制系统进行改造,增加了带Smith预估器的反馈控制和轧机抛钢后的冷却水前馈控制;同时增加了过程自动化控制系统,包括预设定计算、修正设定计算和自学习计算模块。系统改造后,带钢卷取温度控制不稳定的现象基本消除,实现了带钢的冷却模式、卷取温度和冷却速率的精确控制,提高了带钢的质量。 相似文献
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结合现场情况介绍了热轧带钢层流冷却设备和控制系统的数学模型,其中数学模型主要包括空冷模型、水冷模型、反馈控制模型和自学习模型.由于某热轧厂采用非匀速轧制工艺制度,带钢在冷却区内既有较大升速又有较大降速,原层流冷却系统不能够适应轧制速度的变化而影响卷取温度控制精度,故需针对轧制速度的变化进行速度前馈补偿控制;从过程自动化和基础自动化两个方面对速度前馈补偿控制进行了优化.实际应用表明,优化后系统运行稳定可靠,控制精度高,显著提高了产品的性能,并为新钢种的开发奠定了基础. 相似文献
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热轧带钢卷取温度是影响带钢力学性能和板形质量的重要因素,其控制精度对产品质量以及新产品开发都有重要影响。以马钢2250HSM层流冷却控制系统为研究对象,针对原控制系统卷取温度整体命中率较差,头部穿带和尾部抛钢时升降速导致温度控制异常等问题,通过应用新的控制模型、优化模型参数和改进控制功能等方法对现有的控制系统进行了升级改造。实践结果证明,改造优化后的冷却温度控制系统控制精度大幅提高,取得了较好的控制效果。 相似文献
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热连轧层流冷却系统的控制模型及控制策略 总被引:6,自引:1,他引:6
主要介绍了热轧带钢层冷系统中的控制模型及控制策略,包括液位控制、目标卷取温度的前馈控制和带有Smith预估器反馈控制等。其中通过液位控制可以得到稳定的液位,这对保持集管流量的稳定和上位机预设定的精度都是非常重要的。卷取温度的前馈控制和反馈控制对卷取温度控制精度的提高是必不可少的手段。这些控制模型和控制策略已经在工厂中得到应用,并且取得了很好的控制效果,说明这些控制模型和控制策略可以广泛应用于热连轧厂的冷却系统中。 相似文献
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Considering the strip speed during controlled laminar cooling on Baosteel 1580 hot strip mill in China, the influence of strip speed fluctuation on coiling temperature control for the tail and “neck” of the strip was analyzed. The optimization strategies were put forward and proved effective in operation. 相似文献
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Ultra-fast cooling (UFC) is an advanced technology in hot rolling field. Through this technology, great changes on the run-out table are produced in the strip cooling process. In order to adapt to these changes, a new generation of hot strip cooling control system after rolling was developed based on the UFC basic principle. The system can not only accomplish temperature of UFC delivery side, coiling temperature, cooling rate, etc, and multi-objective accuracy control, but also offer more flexibility and new attractive possibilities in terms of cooling pattern on the run-out table, which could be of prime importance for the production of some difficult steels. In addition, through the time-velocity-distance (TVD) profile prediction combined with speed feed-forward control and coiling temperature feedback control, the coiling temperature control precision can be effectively improved during accelerative rolling in the system. At present, the system has been successfully used in the conventional strip production line and CSP short process production line, and its application effect is perfect. 相似文献
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LIU En-yang ZHANG Dian-hua SUN Jie PENG Liang-gui GAO Bai-hong SU Li-tao 《钢铁研究学报(英文版)》2012,19(4):39-42
Abstract: Feedback control is one of the most important ways to improve coiling temperature control precision during laminar cooling process. Laminar cooling equipments of a hot strip mill and structure of the control system were introduced. Feedback control algorithm based on PI controller and that based on Smith predictor were designed and tested in a hot strip mill respectively. Practical application shows that the feedback control system based on PI controller plays a limited role in improving coiling temperature control precision. The feedback control system based on Smith predictor runs stable and reliable. When the measured coiling temperature deviates from the target value, it can be adjusted to the required range quickly and steadily by Smith predictor feedback control, which improves the coiling temperature control precision greatly, and qualities of hot rolled strips are improved significantly. 相似文献
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Improvement of Prediction Method for Strip Coiling Temperature 总被引:2,自引:0,他引:2
Thecoilingtemperatureisoneoftheimportanttechnologicalparametersaffectingthefinalmechani calpropertiesofstrip[1,2 ] .The purposeofcoilingtemperaturecontrolistomakestripcooltorequiredcoilingtemperaturefromhighertemperatureforap propriatemicrostructureandmechanicalproperty .Atpresent ,thecontrolmodelofcoilingtemperatureforBaosteel 2 0 5 0millisaself adaptingempiricalmodel.Thoughthecontrolissatisfactory ,theout of toleranceofcoilingtemperatureisstillobservedinproduction .Itwasconcludedbytheinvest… 相似文献