论文部分内容阅读
用铝粉示踪流动显示方法和激光—多普勒测速仪对冶金熔池模型内的流谱、速度分布、循环流量及循环周期进行了研究。对不同的深径比在不同的底吹气体流量条件下的试验结果表明:熔池的最佳深径比(深度与半径之比)为0.6到0.8,如果把深径比的范围扩大约0.4到1.2,虽搅拌混合较差,但相差不大,还可认为是合理的。深径比小于0.4或大于1.2,其搅拌混合不好。目前的平炉熔池深宽比很小,垂直顶吹氧对熔池的搅拌作用未能充分发挥,需要强化水平方向的搅拌;钢包的深径比过大,作为精炼炉的钢包,应适当扩大直径、减小熔池深度;顶吹转炉的深径比是合适的,采用顶底复合吹炼时底吹点的布置需与顶吹协调一致,又要尽量满足合理的深径比,对于合理布置方案提出了一个定量的计算方法。
The flow pattern, velocity distribution, circulation flow rate and cycle period of the metallurgical molten pool model were studied by the aluminum flow tracing method and laser Doppler velocimetry. The results of different depth-to-diameter ratios at different bottom blowing gas flow rates show that the optimal depth-to-diameter ratio (depth-to-radius ratio) of the weld pool is 0.6 to 0.8. If the depth-to-diameter ratio range is expanded by about 0.4 To 1.2, although mixing poor mixing, but little difference, but also that is reasonable. Deepness ratio is less than 0.4 or greater than 1.2, the mixing is not good. At present, the depth-width ratio of the flat hearth pool is very small, and the effect of the vertical top-blowing oxygen on the stirring of the molten pool fails to be fully exerted, and the stirring in the horizontal direction needs to be intensified. The deep-diameter ratio of the ladle is too large. As the ladle of the refining furnace, Diameter and reduce the depth of the pool; the depth to diameter ratio of the top-blown converter is appropriate, the layout of the bottom blowing point when the top-bottom compound blowing is used must be coordinated with the top blowing, and the reasonable depth-to-diameter ratio should be satisfied as much as possible, The arrangement proposed a quantitative method of calculation.