热轧带钢层流冷却过程温度场研究

doi:10.13228/j.boyuan.issn0449-749X.201400032

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摘要建立了热轧带钢层流冷却过程中温度场的三维有限元模型，对3 mm厚带钢轧后冷却过程带钢温度场进行模拟计算，得出卷取温度比现场测量值低9.5 ℃，相对误差为1.42%，验证了模型和假设的合理性。研究了上喷嘴直径对带钢温度的影响，带钢上表面宽度方向上存在2种不同的冷却区域：位于喷嘴正下方层流冷却过程中交替经过冲击区和平流区的区域和位于两喷嘴之间层流冷却过程中只经过平流区的区域，这造成带钢宽度方向上温度分布不均匀。计算结果表明，喷水量保持不变的情况下，存在一个最佳喷嘴直径，使带钢宽度方向上温度分布更均匀。喷水速度保持不变，增加喷嘴的直径有利于带钢宽度上方温度均匀，但增加了喷水量，降低了带钢的卷取温度。

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关键词 ： CSP, 层流冷却, 数值模拟, 带钢温度

Abstract：A three-dimensional model was established for CSP hot rolling process to simulate the strip temperature field during laminar cooling from impinging water jets in run-out table (ROT) process. The deviation between simulated and measured coiling temperatures was 9.5 ℃ for 3 mm thick strip, and the relative error was 1.42%, which indicated that the model and assumptions were reasonable. The effect of diameter of upper nozzles on strip temperature was investigated. There were two different cooling regions along the width direction on the upper surface: one was under the nozzle, and the laminar region and impingement region were alternately distributed; the other was the laminar region between nozzles during the laminar cooling process. The results showed that there was an optimum nozzle diameter under the condition of constant cooling water flow rate, making the temperature along the width direction distributed more uniformly.When the water jet speed remained the same, increasing diameter of the nozzle was advantageous to the uniform temperature distribution along the width direction, but increased the water flow rate and reduced the strip coiling temperature.

收稿日期: 2014-01-15 出版日期: 2014-10-13

PACS:

TG335.5

引用本文:

张鹏，程树森，常崇明，李积鹏，郑跃强. 热轧带钢层流冷却过程温度场研究[J]. 钢铁, 2014, 49(10): 51-57. ZHANG Peng,,, CHENG Shu-sen,,, CHANG Chong-ming, LI Ji-peng, ZHENG Yue-qiang. Temperature Field of Hot Rolled Strip During Laminar Cooling Process. Iron and Steel, 2014, 49(10): 51-57.

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http://www.chinamet.cn/Jweb_gt/CN/10.13228/j.boyuan.issn0449-749X.201400032 或 http://www.chinamet.cn/Jweb_gt/CN/Y2014/V49/I10/51

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