板坯连铸结晶器浸入式水口结构优化

Optimization of Submerged Nozzle Structure of Slab Continuous Casting Mold

针对断面为180×730 mm^2板坯结晶器液面波动较剧烈,易产生卷渣等问题,基于物理模拟和数值模拟对结晶器内钢液表面流速、液面波动和钢水凝固状况等复杂物理现象进行了研究;对拉速和浸入式水口的角度与底部结构进行了设计和优化,并通过物理模拟和数值模拟进行了验证。结果表明,倾角为20°、浸入式水口的底部结构为凹底30 mm,拉速为0.9～1.0 m/min,结晶器表面流速在0.18 m/s以下,液面波动较为平稳。

In view of the cross section 180×730 mm2 slab mold liquid level fluctuation was severe,easy to produce the defects such as slag,based on physical and numerical simulation on the complicated physical phenomena were studied,such as surface velocity of molten steel in mold flow,liquid level fluctuation and molten steel solidification conditions;The angle and bottom structure of the submerged nozzle and drawing speed were designed and optimized,and physical and numerical simulation were used to verify the results.The results show that the submerged nozzle angle is 20°,the bottom of the submerged nozzle structure is 30 mm,the drawing speed from 0.9 to 1.0 m/min,the mold surface velocity should be less than 0.18 m/s,and the liquid level fluctuation is relatively stable.