连铸中间包水口堵塞的数值模拟

NUMERICAL SIMULATION OF TUNDISH NOZZLE CLOGGING DURING CONTINUOUS CASTING

采用数值模拟方法研究了水口内钢水流场形态及各种因素对水口沉积速率的影响．模拟结果表明：滑板附近处以及水口底部的沉积比其它地方更为明显；吹氩量对水口内的压力存在较大的影响,压力在滑动水口处存在突降；滑动水口开度为66．45％时,浇铸速度为1．2m/min的情况下,要防止吸气,最小吹氩量必须大于10 L/min．Al_2O_3的沉积速率与其浓度成线性增加关系；随着浇铸速度的提高,沉积速率也逐步增大．在吹氩量合适的范围内,吹氩能够降低沉积速率．对于同一拉速,5和30L/min的吹氩量对降低沉积速率的效果相近．

Molten steel flow field in tundish nozzle and effect of some factors on depositing rate were researched by numerical simulation method. The depositions near slide gate and at the bottom of submerged entry nozzle （SEN） were more serious than those of other places. Argon flowrate influenced markedly upon the pressure in the nozzle, and the pressure dropped suddenly near slide gate after molten steel flowing through the slide gate. To avoid inspiration of air, argon flowrate was more than 10 L/min when the slide gate opening ratio was 66.45% and casting speed was 1.2 m/min. Depositing rate of alumina increased linearly with increasing mass concentration of alumina, and increased with inceasing casting speed. Blowing argon only decreased the depositing rate at an appropriate range of argon flowrate. The argon flowrates of 5 and 30 L/min have the similar effect on the depositing rate at the same casting speed.