以改善中厚板轧后冷却均匀性为目的,从高压水射流冲击换热原理出发,研究在超快速冷却条件下的改善钢板冷却均匀性方法。通过合理设计集管及其布置形式,采用上集管位置设定、水比设定以及钢板头尾速度遮蔽等措施,实现了在超快速冷却过程中钢板各个方向上的冷却均匀性。将上述措施用于在线生产,结果表明,钢板各向均匀性控制良好,长度方向95%以上的温度被控制在距离目标返红温度±25℃的范围之内。
To improve the cooling uniformity of plate during ultra fast cooling process, the jet impingement heat transfer between hot steel surface and high-pressure cooling water was investigated. In addition, the headers of ultra fast cooling system were designed and arranged rationally. A series of measures including the setting method of the upper header and water ratio, the speed masking method for head and tail of plate were adopted to improve the cooling uniformity along the thickness and length direction of the controlled cooling plate. The measures to improve the cooling uniformity were used on-line in some factory. The results show that the controlled cooling plate have a good cooling uniformity, and more than 95% of the measured temperature deviation from the target temperature is within ±25 ℃.
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