高拉速厚板坯连铸结晶器流场影响因素的模拟研究

Simulation of Mold Flow Field for the High Speed Slab Continuous Casting

运用数值模拟研究方法,研究高拉速厚板坯连铸结晶器流场的影响因素;研究浸入式水口结构、水口控流方式、水口出口角度、水口浸入深度、结晶器宽度、结晶器厚度、吹氩等因素对结晶器流场、液面流速以及初生坯壳的影响。结果表明在高拉速下,结晶器的流场不稳定因素增多,工艺参数对结晶器流场的影响因数增加。在高拉速下结晶器流场流速高,液面波动大,液钢流束冲击深度大,势必造成产品质量的下降趋势,因此高拉速厚板坯连铸过程必须采用电磁制动或流场控制技术,降低高流速带来的不利影响;水口结构与结晶器规格最优化与匹配能得到适宜的结晶器流场;同时发现高拉速钢液流束对结晶器初生坯壳的影响严重,是高拉速漏钢率高的直接原因之一。

With mathematical simulation, the influence of process parameter, such as submerged nozzle structure,flow control switch, outlet angle, submerged depth of nozzle, width and thickness of mold, argon blowing etc on fluid flow in mold,fluctuation and primary slab shell are studied in high speed continuous casting. The result showed that effect degree for process parameter to liquidity of steel in mold under high speed are larger than low speed. The fluctuating of steel level become severity , depth of impingement increased. Then the quality of slab will be deteriorated with the speed of slab continuous casting increaseing. The optimizing of the submerged entry nozzle and matching for mold and electromagnetic brake are important to high speed slab continuous casting. Flow beam of molten steel in mold under high speed has severe effects for primary slab shell , it＇ s also one of cause for leakage of molten steel.