中文摘要：

基于循环流化床（CFB）一维流动模型及界面反应控制的未反应收缩核模型,建立了CFB连续还原粉铁矿的数学模型,同时考虑了气相与固相的转化过程及粉铁矿的宽筛分特性,并与文献中的实验数据进行了对比,结果显示该模型能够较好地反映CFB内的流动及还原反应规律。在此基础上,针对某工业尺度反应器,又分别研究了气速、反应物成分、循环比等因素对反应器内运行特性的影响规律。结果表明：一定条件下,增大气速和降低还原气体的氧化度可以不同程度地增加固相的转化速率,但前者降低了气体的利用率,而后者增加了气体利用率;控制合适的循环比可以保证固相还原程度更为均匀。

英文摘要：

Based on one dimensional hydrodynamics and reaction controlled un-reacted shrinking core model,a mathematical model was developed to predict the reduction behavior of iron ore fines in a circulating fluidized bed（CFB）reactor.The size distribution characteristics of the ore fines were considered in the model,and both gas phase and solid phase conversions were involved.The calculated results were in good agreement with the experimental data reported in the reference.The influence of gas velocity,gas composition,and circulation ratio on the reduction performance was investigated in an industrial scale CFB reactor.The results showed that solid phase conversion rate increased to different degrees with the increase of gas velocity and decrease of degree of oxidation of reducing gas.But increasing gas velocity could decrease gas phase conversion rate while decreasing degree of oxidation could increase gas phase conversion rate.The degrees of reduction for particles of different sizes became more even with a proper circulation ratio.