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Sanming, China

Zhong L.-C.,Northeastern University China | Shi D.,Northeastern University China | Chen B.-Y.,Fujian Sangang Group Co. | Wang C.-R.,Fujian Sangang Group Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2010

A physical model of fluid flow in a 7-strand tundish was developed in laboratory and the influence of tundish configuration with different flow controllers on flow characteristics was investigated. The results showed that the flow characteristics are poor with the previously designed baffles by which the minimum residence time and peak time are both short, especially for the third and fourth strands. For all the strands their average residence time is short with their dead volume fractions higher than 49%. With the optimized tundish configuration, the flow characteristics of molten steel are greatly improved. Residence time distribution curves change from sharp/narrow form to short/wide one, and the minimum residence time of all the strands are measured to be 44.75 to 73.75 s with a mean residence time over 400 s, but the dead volume fraction markedly decreases to 14.45%~21.10%. As to the multi-strand tundishes, they should have suitable impacting zone volume, and the flow control function at both ends of tundish should be taken into account in the design of flow controllers. Source

Zhong L.-C.,Northeastern University China | Zhu Y.-X.,Northeastern University China | Lai Z.-Y.,Fujian Sangang Group Co. | Chen B.-Y.,Fujian Sangang Group Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2010

With a physical model developed for the top-bottom-side (TBS) blown converters, the effects of blowing process parameters on stirring and mixing behavior in the converter bath were investigated experimentally. The results showed that the flowrate of side-blowing gas affects greatly the bath mixing time, and a critical value of side-blowing gas flowrate is found in the TBS blown converters. Horizontal stirring effect in the bath is intensified gradually and the mixing time is shortened when the side-blowing gas flowrate is increased but lower than the critical value. But, when the side gas flowrate reaches the critical value, the mixing time in the bath drops considerably and, with the side-blowing gas flowrate further enhanced, it no longer changes obviously. A side nozzle with small section area as possible is recommended under the precondition that large enough side-blowing gas flowrate can be provided. In addition, an appropriate bottom-blowing gas flowrate is beneficial to the mixing in the TBS blown converter bath, and the change of top lance height or top-blowing gas flowrate affects unobviously the mixing time in the TBS blown converter bath. Source

Zhong L.C.,Northeastern University China | Wang X.,Northeastern University China | Zhu Y.X.,Northeastern University China | Chen B.Y.,Fujian Sangang Group Co. | And 2 more authors.
Ironmaking and Steelmaking | Year: 2010

The influence of blowing process parameters on bath stirring was investigated in a model of a top-bottom-side blown converter using physical modelling experiments. It was shown that the side blowing gas flowrate has an important influence on bath mixing time which decreases as side tuyere gas flowrate increases up to a critical flowrate and then plateaus. Bottom gas injection is favourable for bath mixing for top-bottom-side blown converters; however, top lance height, top gas flowrate and bath level have little influence. © 2010 Maney Publishing. Source

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