方坯连铸结晶器内表面流速与卷渣行为模拟
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摘要
针对中小断面方坯侧分水口浇铸技术,以实际180 mm×240 mm断面方坯连铸结晶器为原型,基于相似原理,采用1:1的物理模型,比较了直通型和侧分旋流型水口浇注时在不同拉速和浸入深度下的结晶器内自由表面流速和渣层状态。结果表明:相同的浸入深度和拉速下,旋流型水口浇注时结晶器内各测点表面流速比直通型水口大;在实验条件下,直通型水口表面流速为0.010~0.023 m/s,旋流型水口为0.010~0.055 m/s,拉速和浸入深度对旋流型水口表面流速的影响较直通型水口显著;此外,采用旋流水口时结晶器的渣层波动要比采用直通型水口时频繁,拉速1.0 m/min、浸入深度120 mm时,其渣层波动适宜,钢渣界面活跃且无卷渣和裸钢现象发生,此时两测点的表面流速分别为0.028和0.032 m/s,是较适宜的工艺条件。
For the side-port nozzle casting technology of middle-small section billet,the free surface flow velocity and slag entrapment behavior of fluid in a 180 mm×240 mm billet continuous casting mould using single-port straight nozzle and four-port swirling nozzle casting,respectively,were investigated with 1:1 water model,based on the similarity principle. The results show that the surface flow velocity of fluid in the mold using swirling nozzle is larger than using the straight one at the same immersion depth and casting speed. The surface flow velocity of fluid using straight nozzle is in the range of 0.010~0.023 m/s,while it is 0.010~0.055 m/s using swirling nozzle at the given experiment conditions.The casting speed and immersion depth affect the surface flow velocity of fluid in the mold with swirling nozzle more obviously. Moreover,the fluctuation of slag layer is more frequent for the swirling nozzle than for the straight one. At the casting speed of 1.0m/min and the immersion depth of 120 mm,the slag layer fluctuates properly and the slag-steel interface keeps active. There's no slag entrapped into the fluid and no simulated metal fluid exposed in the air.
For the side-port nozzle casting technology of middle-small section billet,the free surface flow velocity and slag entrapment behavior of fluid in a 180 mm×240 mm billet continuous casting mould using single-port straight nozzle and four-port swirling nozzle casting,respectively,were investigated with 1:1 water model,based on the similarity principle. The results show that the surface flow velocity of fluid in the mold using swirling nozzle is larger than using the straight one at the same immersion depth and casting speed. The surface flow velocity of fluid using straight nozzle is in the range of 0.010~0.023 m/s,while it is 0.010~0.055 m/s using swirling nozzle at the given experiment conditions.The casting speed and immersion depth affect the surface flow velocity of fluid in the mold with swirling nozzle more obviously. Moreover,the fluctuation of slag layer is more frequent for the swirling nozzle than for the straight one. At the casting speed of 1.0m/min and the immersion depth of 120 mm,the slag layer fluctuates properly and the slag-steel interface keeps active. There's no slag entrapped into the fluid and no simulated metal fluid exposed in the air.
引文
[1]张永亮,朱苗勇,张胜军,等.浸入式水口堵塞过程板坯结晶器内流动与液面波动的模拟[J].特殊钢,2006,27(5):27.
[2]高泽平,苏振江.大方坯连铸结晶器浸入式水口结构优化[J].炼钢,2008,24(2):42.
[3]祝明妹,文光华,唐萍,等.大方坯连铸结晶器四孔伸入式水口研究[J].钢铁,41(增刊2):270.
[4]于学斌,李小虎,郭唐瑜,等.大方坯用四孔浸入式水口操作参数的优化[J].连铸,2006,2:4,8.
[5]林晓川,李京社,杨树峰,等.板坯连铸结晶器内液面波动的水模型研究[J].炼钢,2011,27(2):56.
[6]于会香,王新华,陆巧彤,等.结晶器内钢液流动特性的优化[J].北京科技大学学报,2009,31(4):477.
[7]徐海伦,文光华,唐萍,等.水口出口结构对大方坯连铸结晶器内流体流动的影响[J].过程工程学报,2009,9(1):19.
[8]Kubota J,Okimoto K,Suzuki M,et al.Mechanism of level fluctuation and mold powder caching in slab continuous casting at high speed[C]//Sixth International Iron and Steel Congress Proceeding.Nagoya:ISIJ,1990:355.
[9]林晓川,李京社,张兴利,等.板坯连铸结晶器内钢液表面流速的水模型研究[J].中国冶金,2010,20(12):15.
[10]梁启华,宋满堂,王海峰.中碳结构钢表面纵裂纹产生原因分析与改善措施[J].连铸,2014,1(1):45.
[11]陆巧彤,杨荣光,王新华,等.板坯连铸结晶器内钢液表面流速水模研究[J].炼钢,2007,23(1):30.
[2]高泽平,苏振江.大方坯连铸结晶器浸入式水口结构优化[J].炼钢,2008,24(2):42.
[3]祝明妹,文光华,唐萍,等.大方坯连铸结晶器四孔伸入式水口研究[J].钢铁,41(增刊2):270.
[4]于学斌,李小虎,郭唐瑜,等.大方坯用四孔浸入式水口操作参数的优化[J].连铸,2006,2:4,8.
[5]林晓川,李京社,杨树峰,等.板坯连铸结晶器内液面波动的水模型研究[J].炼钢,2011,27(2):56.
[6]于会香,王新华,陆巧彤,等.结晶器内钢液流动特性的优化[J].北京科技大学学报,2009,31(4):477.
[7]徐海伦,文光华,唐萍,等.水口出口结构对大方坯连铸结晶器内流体流动的影响[J].过程工程学报,2009,9(1):19.
[8]Kubota J,Okimoto K,Suzuki M,et al.Mechanism of level fluctuation and mold powder caching in slab continuous casting at high speed[C]//Sixth International Iron and Steel Congress Proceeding.Nagoya:ISIJ,1990:355.
[9]林晓川,李京社,张兴利,等.板坯连铸结晶器内钢液表面流速的水模型研究[J].中国冶金,2010,20(12):15.
[10]梁启华,宋满堂,王海峰.中碳结构钢表面纵裂纹产生原因分析与改善措施[J].连铸,2014,1(1):45.
[11]陆巧彤,杨荣光,王新华,等.板坯连铸结晶器内钢液表面流速水模研究[J].炼钢,2007,23(1):30.