||Iron ore sintering is one of the important steps in the Iron making process, including combustion reaction, phase chane, and the heat transfer and mass transfer in the porous media. This study is mainly divided into two parts, experimental measurement and numerical simulation: (1) The experimental measurement part is to use the existing sinter cup to extract the experimental data, and the data are used in the parameter correction and the verification of the numerical results. (2)The numerical simulation part is to establish a sintering numerical model, corresponding the experimental setup. The model parameters and results are adjusted and compared with the measured data to make the simulation reliable. In the end, this numerical models is used to predict the effect of several parameters to further understand the sintering phenomena and improve the sintering technology.|
This experiment includes the bulk density measurements of raw material after the granulation process, the temperature variation inside the sinter bed, the inlet air flow speed and pressure drop of the sintering cup in the sintering process. In addition, the air flow speed and pressure drop at different height are also measured at room temperature for the coarse litter, fine litter and sintering raw material. The measured data is processed by linear regression methods to find the pressure loss coefficients of the porous medium inside the model.
This numerical model considers the conservations of mass, momentum, energy and species. The heat and mass transfer in the sintering process includes the water evaporation and condensation and fine coke combustion heat release. The coke combustion heat release is the main heat source in the sintering process, heating the sinter bed to the desired temperature (1200℃~1400℃). Water in the sinter bed is evaporated by absorbing heat at the leading edge of the high temperature area, and condensed by releasing heat in the downstream low temperature area, which is also the significant phenomenon inside the sinter bed.
This study shows this model can successfully simulate the fine coke combustion, water evaporation and condensation and the movement of high temperature sinter area in sinter bed. Simulation shows the phase change of waterl cause the temperature quickly rise to 50-60℃ in the dowsteram. This simulation shows the good consistency in the temperature variation between the simulation result and the measured data.