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Abstract In order to study the effects of combined-blowing parameters on the mixing behavior and dephosphorization rate of the dephosphorization converter， here based on the similarity principle， a water model of a 300 t duplex dephosphorization converter was established. 21 experiments considering the number of nozzles at the bottom， the nozzle arrangement， the intensity of top blowing， the position of oxygen lance and the intensity of bottom blowing were carried out to investigate the mixing effect of molten steel. The numerical simulation for further comparative analysis was conducted. The results show that using 8 bottom blowing elements of symmetrical and centralized arrangement， and taking a large flow rate of bottom blowing， the effect of bath mixing can be enhanced. The industrial tests show that the average of semi-steel[w([P])]reduced from 0.024 9% to 0.017 3%， and the dephosphorization rate increased from 75.3% to 85.4%.The whole mixing efficiency and the dephosphorization effect of the bath have been obviously improved.
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Received: 16 March 2016
Published: 08 October 2016
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2016, Vol. 51 
