【摘要】 本文基于气泡理论,提出了 B 类物料固相加工的流化床模型。结合已经获得的粗粒铁鳞氢还原的反应速度方程,对φ0.6米的中试装置进行了数学模拟,计算预测和实验结果相当一致。本文还采用了一些简单流化床模型对两套热试装置进行了计算预测。结果表明,对于较小的反应器,几个模型的预测结果比较接近,且与实测结果比较吻合;随着反应器尺寸的扩大,一些简单模型的计算结果偏离实验值,而本文所提模型能够适应反应器的放大。更多还原

【Abstract】 Based on the bubbling theory,the present paper has proposed a fluidized- bed model for predicting the unconverted fraction of coarse particles in gas- solids reactions.The predicted results by the present model and the availa- ble kinetic data were compared with the experimental data from a pilot plant reactor with a diameter of 600mm which produces iron powder from mill scale. The calculation results are in good agreement with the experimental data. Predictions by the present model were also compared with those by the perfect-mixing model,simpler two-phase model and so on.For a small scale reactor the difference between the estimated results by these models are negligble.As the size of reactor increased,the deviation of prediction from the experimental data would become noticeable for those simple models, while the present model has been found to be more suitable for the scale-up of the reactors.更多还原