圆坯结晶器偏心浇注条件下水口优化的模拟研究

Simulation Study on Optimization of Eccentric Nozzle Structure for Round Mould

针对连铸生产过程中常出现水口不对中的问题,通过旋流水口来消除偏心水口带来的不利影响。建立了圆坯结晶器内三维流动、传热数学模型,结合水模型实验,计算分析了水口优化前后结晶器内的流场和温度场。结果表明:合适的水口切向倾角可以使钢液产生较强的旋流,降低偏心浇注条件下结晶器内的偏流指数。旋流流场还可以减小钢液的冲击深度,促进钢液过热耗散,使热中心上移,均匀初生坯壳厚度,提高铸坯品质。

For the problems of nozzle eccentric in continuous casting, the swirling flow nozzle was used to eliminate the adverse effects of eccentric nozzle. A three dimension mathematical model was built for fluid flow and heat transfer in the round bloom continuous casting mould. The flow and temperature field were computed under prototype nozzle and the new type nozzle conditions. The results show that a strong horizontal swirling flow is observed with a proper nozzle angles, the drift index and impact depth of liquid steel can be declined. The swirling flow also be beneficial to dissipation of steel supper heat and the cross-section solidified shell distributes uniformly in the mould.