论文部分内容阅读
建立了折流式移动流化床内粉铁矿预还原的二维气固反应流CFD模型.模型的数值求解采用PHOENICS和FLUENT的联合求解.与之前的实验结果相比,在冷态条件下单床层平均压降和气固相流动行为的数值模拟结果与其基本一致,得出所提出的数学模型是可靠的.在此模型基础上,对采用COREX输出煤气对铁矿粉预还原的工艺过程进行热态模拟.在模拟的工况条件下,还原气温度的整体降幅700 K,气相CO和H_2还原势的利用率分别达到38%和26%,矿粉的还原分数达到75%,即反应器内有良好的气固换热而且对COREX煤气还原势的利用率较高,实现了对还原气热能和还原势的梯度利用.
A two-dimensional gas-solid CFD model of pre-reduction of iron ore in baffled mobile fluidized bed was established.The numerical solution of the model was jointly solved by PHOENICS and FLUENT.Compared with the previous experimental results, under the condition of cold condition The results of single-bed average pressure drop and gas-solid flow behavior are consistent with those of the numerical simulation, and the proposed mathematical model is reliable.On the basis of this model, the process of pre-reduction of iron ore by COREX output gas is carried out Under the simulated working conditions, the overall decrease of the temperature of the reducing gas is 700 K, the utilization rates of the CO and H 2 reduction potentials in the gas phase reach 38% and 26% respectively, and the reduction fraction of the ore powder reaches 75% There is a good gas-solid heat transfer and a higher utilization rate of COREX gas reduction potential, achieving a gradient utilization of the heat energy and the reduction potential of the reducing gas.