小倒角结晶器窄面铜板角部冷却结构优化

Optimization of corner cooling structure of narrow copper plate in small chamfered mold

为解决某钢厂板坯小倒角结晶器高拉速生产时铸坯角部纵裂纹比例增大问题,在原型倒角分叉槽冷却结构基础上,提出不同圆孔直径和圆孔位置的1孔1槽方案。建立窄面铜板和冷却水三维传热耦合模型,并通过工业实测热电偶温度和冷却水进出口水温差进行验证,计算了优化前后不同方案的窄面铜板和冷却水温度和速度场。对比分析不同方案的铜板热面温度值大小和均匀性后发现,相比于分叉槽结构,圆孔直径D=8 mm和圆孔位置H=26 mm的1孔1槽冷却结构:弯月面铜板倒角热面温度降低幅度最大为14.4~17.6 K;螺栓截面铜板倒角热面温度降低幅度最大为10.9~12.3 K;圆孔内冷却水流速达到8.4 m/s,保证了对倒角面和倒角顶点铜板的冷却;螺栓两侧水槽冷却水流速达10.0 m/s,增强了螺栓周围铜板冷却均匀性。

In order to solve the problem of increasing the proportion of longitudinal cracks in the corner of the slab during the high-speed production of small chamfered mold in a steel plant,based on the existing chamfer furcal cooling structure water slot,a one-hole one-slot scheme with different round hole diameters and round hole positions was proposed.A three-dimensional heat transfer coupling model of the narrow side copper plate and cooling water was established.Industrial measured thermocouple temperatures and cooling water inlet/outlet temperature difference were used for validation.The temperature and velocity fields of the narrow side copper plate and cooling water were calculated for different one-hole-one-slot cooling structure schemes with different circular hole diameters and positions.The results show that the proposed one-hole-one-slot cooling structure with a circular hole diameter of 8 mm and a circular hole position of 26 mm results in a maximum temperature reduction of 14.4-17.6 K on the chamfered hot surface of bent copper plate and a maximum temperature reduction of 10.9-12.3 K on the chamfered hot surface of bolt cross-sectional copper plate,compared to the furcal water slots cooling structure.The cooling water flow in the circular hole reaches 8.4 m/s,effectively cooling the chamfered surface and vertex of the copper plate.Additionally,the cooling water flow rates on both sides of the bolt s water tank reach 10.0 m/s,enhancing the cooling uniformity of the plate around the bolt.