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GONG Dian-yao XU Jian-zhong PENG Liang-gui WANG Guo-dong LIU Xiang-hua 《钢铁研究学报(英文版)》2007,14(4):11-14
The mathematical model for online controlling hot rolled steel cooling on run-out table (ROT for abbreviation) was analyzed, and water cooling is found to be the main cooling mode for hot rolled steel. The calculation of the drop in strip temperature by both water cooling and air cooling is summed up to obtain the change of heat transfer coefficient. It is found that the learning coefficient of heat transfer coefficient is the kernel coefficient of coiler temperature control (CTC) model tuning. To decrease the deviation between the calculated steel temperature and the measured one at coiler entrance, a laminar cooling control self-learning strategy is used. Using the data acquired in the field, the results of the self-learning model used in the field were analyzed. The analyzed results show that the self-learning function is effective. 相似文献
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超快速冷却工艺作为热轧钢板生产的核心技术,对改善板材产品组织形态、提升产品性能具有重要意义。在中厚钢板的超快速冷却过程中,心部与表面之间的冷却速度差异使得钢板在厚度方向上形成内外温度差,而超快速冷却中钢板表面的换热机制较为复杂,两者综合提升了中厚板冷却机制的界定难度。为提升中厚板超快冷模型计算精度,完善其换热体系,建立了中厚钢板轧后超快速冷却过程中等效换热系数反求法的数学模型。该模型依托离散解析法,基于导热微分方程及物体正规阶段的状态特点,将求得的超越方程根转化为等效换热系数,并将此作为超快冷温度场模型的边界条件。在此基础上,构建了超快速冷却温度场仿真模型,验证了20 mm钢板超快速冷却机制下的温度场。结果表明,等效换热系数反求法的数学模型能够适用于中厚钢板的超快冷工艺。 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
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《钢铁冶炼》2013,40(1):51-56
AbstractThe growth in demand for high quality metal alloys has placed considerable emphasis on the type of cooling methods used in manufacturing processes, in particular, the production of highly tailored steel through controlled cooling on the runout table. The present study focuses on the heat transfer (cooling of hot rolled steel strips) on a runout table. The purpose of the study was to develop an efficient experimental method and collect temperature data under conditions similar to those that occur during industrial runout table conditions in a steelmill. Surface and internal temperatures were measured during transient cooling of a flat, upward facing fixed steel plate cooled by a highly subcooled single, circular, free surface jet of water. Measurements were made at stagnation and several streamwise distances from the stagnation point. A numerical, finite difference model was applied to calculate the surface heat flux using measured temperatures. The effect of water flowrate and subcooling on the overall heat transfer with emphasis on the maximum heat flux is discussed. 相似文献
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超快速冷却作为近年来热轧钢材控轧控冷技术领域最重要的技术突破,为热连轧产线产品的生产工艺进步提供了重要支撑。基于热连轧板带钢超快速冷却系统的开发与应用实践,在阐明高温运动钢板高强度均匀化冷却机理机制的基础上,重点介绍了超快冷系统在热连轧产线的工艺配置,以及采用超快冷工艺,在系列细晶钢、高钢级管线钢、热轧双相钢、低残余应力热轧板带钢等特色化产品领域的工艺开发及应用情况。基于超快冷系统冷却速度无级调控优势,开发了基于超快冷装备的层流冷却、加强型冷却、超快速冷却3种冷却模式及模型系统,进一步结合粗轧中间坯超快冷控温系统,构建了基于超快速冷却的热连轧线新一代控轧控冷多工序温度协同控制系统,相关技术应用取得良好效果。 相似文献