厚板坯连铸结晶器的浸入式水口优化

Optimization of Submerged Entry Nozzle Structure of Thick Slab Continuous Casting Mold

对断面尺寸为250 mm×1550 mm厚板坯结晶器进行了水力学模拟试验,研究了浸入式水口结构及工艺参数对结晶器内液面波动及流场的影响,并针对现有水口下出现的铸坯角部夹渣及表面质量问题,对水口结构进行了优化。结果表明:水口结构对液面波动影响较大。同种工况下,S1水口的流股到达窄边的冲击速度最大,达到0.29 m/s,冲击深度最小,S1水口的液面波高比其他水口大。S1水口为较优水口,推荐的浸入深度为110~150 mm,吹气量为7~9L/min。

The hydraulic simulation tests of thick slab continuous casting mold with section size of 250 mm×1550 mm were carried out, and the influence of submerged entry nozzle＇s structure and process parameters on the liquid surface＇s fiuctuation and flow field in the mold were studied. The nozzle structure was optimized according to the slag and the surface quality of the cast billet. The results show that the nozzle＇s structure has great influence on the liquid surface＇s fluctuation. Under the same process parameters, the flow rate at narrow edge of nozzle S1 is maximum, which is 0.29 m/s. The impact depth is minimum, and the liquid surface＇s wave height of nozzle SI is larger than that of other nozzles. SI nozzle is superior, the recommended immersion depth is 110 - 150 ram, and the gas blowing rate is 7-9 L/min.