Effect of Distributor Structure on the Uniformity of Multiphase System in Fluidized Ironmaking Process

Abstract

For the uneven gas–solid distribution in the process of fluidized bed ironmaking, the effect of the distributor on gas–solid homogeneity in fluidized bed was investigated by using physical simulation . Statistical analysis and spectral analysis were used to investigate the pressure fluctuations in the fluidized bed with the distributor of different perforated ratio , and the results were verified by optical analysis. The results reveal that the smaller perforated ratio of the distributor can reduce the bubble size of the whole bed and reduce the pressure fluctuation . Thus, the gas–solid dispersion is uniform, and the fluidization quality of the fluidized bed is improved. However, the distributor has a limited effect area, which has a great influence on the lower part of the fluidized bed . As the gas velocity and the height increase, the effect becomes weaker. Under the operating conditions of 100 L/min, the perforated ratio of 0.91% can reduce the pressure drop of the entire bed by 65%. It can also reduce the pressure drop deviation in the lower part of the bed by more than 79%.