Simulation Experiment Study Of Gas-Liquid Two Phase Flow In A 210t Duplex Combined Blown Converter

In this study, based on the 210t duplex combined blown converter of engineering design, the organic glass converter model(8:1),the supersonic nozzle models and the non-isotherm rectification analog models are built according to the similarity principle. Through the cold model experiment, the effects of the number and configuration of the bottom tuyeres, the bottom aero supplied strength, the lance height and the other facters on the mixing time, the penetration depth, the impact diameter, the splashing capacity have been studied and the conclusions obtained can establish an important basis for engineering design and production. The experiments'results show that:①The relationship of the mixing time and the number of the bottom tuyeres is not a monotonous fuction. But in the experimental scope, the number of the bottom tuyeres that make mixing time to be the shortest is eight. The effect of the configuration of the bottom tuyeres is significant, and the centralized arrangement of the bottom tuyeres are better than the distributed arrangement. The optimum configuration of the bottom tuyeres for the 210t combined blown converter is B3.②In the experimental bath depth scope, the mixing time decreases with the increasing bath depth, and the optimum bath depth is 224mm(corresponding to 1790mm in industrial case)。③As for the dephosphorization converter: The effect of the bottom aero supplied strength on the mixing time is significant. The reasonable bottom aero supplied strength is between 0.21Nm3/min.t and 0.27 Nm3/rnin.t. The effect of the lance height on the penetration depth is significant. The penetration depth decreases with the increasing lance height and the ratio of the penetration depth to the bath depth is between 21.4% and 32.9%. The effect of the lance height on the impact diameter is significant, too.The impact diameter increases with the increasing lance height, and the ratio of the impact diameter to the bath diameter is between 36.8% and 44.0%. Beause of the appropriate penetration depth and impact diameter, the optimum lance height is 350mm (corresponding to 2800mm in industrial case)④As for the decarbonization converter: The effects of the bottom aero supplied strength and the lance height on the mixing time are significant. The reasonable bottom aero supplied strength is between 0.15 Nm3/min.t and 0.21 Nm3/min.t. When the lance height is 225mm(corresponding to 1800mm in industrial case), the mixing time reaches the shortest. There exists a critical value about the effect of the lance height on the mixing time. Below the critical value, the mixing time decreases and above the critical value, the mixing time increases with the increasing lance height. The effect of the lance height on the splashing capacity is significant. There exists a critical lance height which is 250mm(corresponding to 2000mm in industrial case)about the splashing capacity. Below the critical value, the splashing capacity increases and above the critical value, the splashing capacity decreases with the increasing lance height. The effect of the lance height on the penetration depth is significant and the penetration depth decreases with the increasing lance height. The ratio of the penetration depth to the bath depth is between 49.5% and 73.8%. The effect of the lance height on the impact diameter is significant and the impact diameter increases with the increasing lance height. The ratio of the impact diameter to the bath diameter is between 26.0% and 37.0%. Through overall evaluation, the optimum lance height is 225mm(corresponding to 1800mm in industrial case).