在前文建立的分相共存快速床动力学模型的基础上,对分相模型中存在颗粒团聚物时的上升稀相进行了受力分析。以有限直径提升管中颗粒终端速度的修正,导出了上升稀相受力关于等效管径与浓稀相滑移速度的修正表达式。将本模型预报的上部稀相固含率与已有的实验数据经验关联式进行了对比,并根据所得结果初步优化了模型参数（k=8,n=6）。进而,根据所得模型参数计算了下部浓相固含率随曳力函数f（ε）的变化规律;与李佑楚经验关联式相比,同样具有合理的一致性。本文工作进一步验证了快速床动力学统一模型的整体合理性。
Based on the separate phase coexistence model for fast fluidization proposed previously, force analysis of the upside dilute phase with particle clusters was performed first.The expression of the force acting on the upside dilute phase about the equivalent diameter and two-phase slip velocity was derived through the amendment,of the particle terminal velocity in a limited diameter riser.The upside dilute phase solid holdup predicted were compared with the empirical formulae in literatures, and the model parameters were preliminary optimized according to the results（k=8,n=6）.Variation of the lower dense phase solid holdup with the drag function was also calculated and compared with Li＇s formula,showing general consistency with the latter.This work verified further the overall rationality of the unified fast fluidization dynamic model developed.
参考文献
| [1] | 章明川,张楚,林郁郁,徐旭常.快速床动力学统一模型-由A型噎塞向C型噎塞的连续转变Ⅰ：模型构建[J].工程热物理学报,2011(05):895-899. |
| [2] | Duvvuri Subbarao .A model for cluster size in risers[J].Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems,2010(1):48-54. |
| [3] | D.Bai .Quantitative estimation of solids holdups at dense and dilute regions of circulating fluidized beds[J].Powder Technology,1999(3):183-190. |
| [4] | Xiao-Bo Qi;Jesse Zhu;Wei-Xing Huang .A new correlation for predicting solids concentration in the fully developed zone of circulating fluidized bed risers[J].Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems,2008(1):64-72. |
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